What You Will Learn in This Article
- The anatomy of the digastric muscle — origin, insertion, nerve supply, and all its actions
- Why depression of the mandible requires the hyoid to be fixed first
- All suprahyoid and infrahyoid muscles — their actions and nerve supplies
- The four muscles of mastication — actions, nerve supply, and which movement each produces
- Which muscles produce elevation, depression, protrusion, retrusion, and lateral movements of the mandible
- Clinical correlates — trismus, TMJ dysfunction, and nerve lesions affecting jaw movement
- High-yield exam facts, mnemonics, and the most dangerous exam traps on this topic
- 5 original practice MCQs to test yourself immediately
📖 Introduction: Why This Topic Matters in Exams
Consider a patient who cannot open his mouth after a lower third molar extraction. Or a trauma patient with a fractured mandible and altered bite. Or a dental student being asked in a viva: “If the mylohyoid nerve is cut, which muscle is paralysed?” Every one of these scenarios requires a precise understanding of which muscles move the mandible, how, and which nerve controls each.
The digastric muscle is a perennial favourite in anatomy MCQs — partly because its dual-belly design and dual nerve supply make it uniquely testable, and partly because students confuse its actions with those of other floor-of-mouth muscles. The question “which muscle depresses the mandible?” has multiple correct answers depending on context, but the digastric is the most clinically prominent and most frequently correct answer.
This article gives you mastery over the entire functional anatomy of jaw movement — from the suprahyoid group to the muscles of mastication — so you can confidently tackle any question in this cluster.
🔬 Section 1 — The Digastric Muscle: Complete Anatomy
Structure — The Two-Belly Design
The digastric is named from the Greek di (two) + gaster (belly) — it has two muscular bellies connected by an intermediate tendon. This intermediate tendon is held to the hyoid bone by a fibrous loop (a pulley-like arrangement), which is critical to understanding the muscle’s mechanics.
| Feature | Anterior Belly | Posterior Belly |
|---|---|---|
| Origin | Digastric fossa of mandible (lower border, near midline) | Mastoid notch (medial surface of mastoid process) |
| Insertion | Intermediate tendon (held to hyoid by fibrous sling) | Intermediate tendon (held to hyoid by fibrous sling) |
| Nerve supply | Mylohyoid nerve (branch of inferior alveolar nerve → V3, mandibular division of trigeminal) | Facial nerve (CN VII) — digastric branch |
| Arterial supply | Submental artery (from facial artery) | Posterior auricular and occipital arteries |
The dual nerve supply is the single most tested fact about the digastric muscle. Anterior belly = V3 (trigeminal); Posterior belly = CN VII (facial). This is unique among muscles — most muscles have a single nerve supply. The reason is embryological: the two bellies arise from different pharyngeal arches.
Embryological Basis of Dual Nerve Supply
- Anterior belly — derived from 1st pharyngeal arch (mandibular arch) → nerve of 1st arch = trigeminal nerve (V3)
- Posterior belly — derived from 2nd pharyngeal arch (hyoid arch) → nerve of 2nd arch = facial nerve (CN VII)
This is why the same muscle has two completely different nerve supplies — they are embryologically two different muscles that fuse via the intermediate tendon.
🔬 Section 2 — Actions of the Digastric Muscle
The digastric muscle has two main actions, depending on which structure is fixed (the mandible or the hyoid):
Action 1: Depression of the Mandible (Opening the Mouth)
When the hyoid bone is fixed (stabilised by the infrahyoid muscles — sternohyoid, omohyoid, sternothyroid, thyrohyoid):
- Both bellies of the digastric contract
- Since the hyoid cannot move downward (it is fixed), the force is transmitted upward to the mandible
- The mandible is pulled downward and backward, opening the mouth
- This is the primary action tested in MCQs
Key concept: The digastric cannot depress the mandible alone — it requires the infrahyoid muscles to fix the hyoid first. This is called a synergistic muscle action. Examiners love asking “what must happen before the digastric can depress the mandible?”
Action 2: Elevation of the Hyoid (During Swallowing)
When the mandible is fixed (clenched teeth / closed mouth with mandible held by elevator muscles):
- Both bellies of the digastric contract
- Since the mandible cannot move upward (it is fixed), the force is transmitted downward to the hyoid
- The hyoid is pulled upward and forward
- This is critical during swallowing and speaking — elevation of the hyoid moves the larynx upward, closing the laryngeal inlet (along with the epiglottis) to prevent aspiration
Summary of Digastric Actions
| Condition | Fixed Structure | Result |
|---|---|---|
| Hyoid fixed by infrahyoids | Hyoid | Mandible depressed (mouth opens) |
| Mandible fixed by elevators | Mandible | Hyoid elevated (swallowing) |
🔬 Section 3 — All Suprahyoid Muscles: Complete Table
The suprahyoid muscles are the group that includes the digastric — they all lie above the hyoid bone and connect it to the mandible or skull:
| Muscle | Origin | Insertion | Nerve Supply | Action |
|---|---|---|---|---|
| Digastric (anterior) | Digastric fossa, mandible | Intermediate tendon → hyoid | Mylohyoid nerve (V3) | Depresses mandible; elevates hyoid |
| Digastric (posterior) | Mastoid notch | Intermediate tendon → hyoid | Facial nerve (CN VII) | Depresses mandible; elevates hyoid |
| Mylohyoid | Mylohyoid line of mandible | Hyoid body + midline raphe | Mylohyoid nerve (V3) | Elevates floor of mouth + hyoid; depresses mandible |
| Geniohyoid | Inferior mental spine (genial tubercle) of mandible | Hyoid body | C1 via hypoglossal nerve (CN XII) | Elevates and protrudes hyoid; depresses mandible |
| Stylohyoid | Styloid process | Hyoid body | Facial nerve (CN VII) | Elevates and retracts hyoid |
Critical exam fact: Geniohyoid is supplied by C1 fibres travelling with the hypoglossal nerve (CN XII) — not by CN XII itself. This is a classic trap. The hypoglossal nerve merely acts as a “taxi” for the C1 fibres; the geniohyoid is truly a cervical spinal nerve muscle.
Another trap: Stylohyoid is supplied by the facial nerve (CN VII) — same as the posterior belly of digastric. Both are 2nd pharyngeal arch derivatives.
🔬 Section 4 — Infrahyoid Muscles (Strap Muscles)
These muscles fix the hyoid, making suprahyoid-mediated mandibular depression possible:
| Muscle | Nerve Supply | Action |
|---|---|---|
| Sternohyoid | Ansa cervicalis (C1, C2, C3) | Depresses hyoid |
| Omohyoid | Ansa cervicalis (C1, C2, C3) | Depresses hyoid |
| Sternothyroid | Ansa cervicalis (C1, C2, C3) | Depresses thyroid cartilage |
| Thyrohyoid | C1 via hypoglossal nerve | Depresses hyoid; elevates thyroid cartilage |
Exam pearl: Thyrohyoid (infrahyoid) and geniohyoid (suprahyoid) are both supplied by C1 via the hypoglossal nerve — two muscles from opposite groups sharing the same unusual nerve supply. Very high-yield comparison.
🏥 Section 5 — Muscles of Mastication: The Jaw Movers
The four true muscles of mastication are all supplied by the mandibular nerve (V3) — the motor root of the trigeminal nerve. They are all derived from the 1st pharyngeal arch.
The Four Muscles of Mastication
| Muscle | Origin | Insertion | Primary Action |
|---|---|---|---|
| Temporalis | Temporal fossa (temporal bone) | Coronoid process + anterior ramus of mandible | Elevation (closing) + Retrusion (posterior fibres) |
| Masseter | Zygomatic arch | Lateral surface of ramus + angle of mandible | Elevation (most powerful elevator) + some protrusion |
| Medial pterygoid | Medial surface of lateral pterygoid plate + pyramidal process of palatine bone | Medial surface of ramus + angle of mandible | Elevation + Protrusion |
| Lateral pterygoid | Upper head: infratemporal surface of greater wing of sphenoid; Lower head: lateral surface of lateral pterygoid plate | Upper head: articular disc + capsule of TMJ; Lower head: pterygoid fovea of mandibular condyle | Protrusion + Depression + Lateral movement |
Actions of Mastication — Organised by Movement
Elevation of Mandible (Closing the Mouth)
The most powerful movement — biting and chewing:
- Masseter (most powerful)
- Temporalis (especially vertical fibres)
- Medial pterygoid
Mnemonic: “My Tall Masseter” — Medial pterygoid, Temporalis, Masseter = elevators
Depression of Mandible (Opening the Mouth)
- Digastric (both bellies) — suprahyoid; requires hyoid fixation
- Mylohyoid — suprahyoid
- Geniohyoid — suprahyoid
- Lateral pterygoid (lower head) — the only true muscle of mastication that assists depression
- Gravity also assists depression
Key point: The muscles of mastication do NOT include the primary depressors. Depression is mainly performed by suprahyoid muscles + gravity. Among the four muscles of mastication, only the lateral pterygoid assists depression.
Protrusion of Mandible (Pushing jaw forward)
- Lateral pterygoid (both heads) — primary protrusor
- Medial pterygoid — assists
- Masseter (superficial fibres) — assists
Retrusion of Mandible (Pulling jaw backward)
- Temporalis (posterior fibres) — primary retrusor
- Digastric (posterior belly) — assists
- Geniohyoid — assists
Lateral/Side-to-Side Movement (Grinding, chewing)
- Lateral pterygoid of one side contracts → mandible moves to the OPPOSITE side
- Medial pterygoid of one side assists
- Alternating left and right contractions produce grinding motion
Exam pearl: Lateral pterygoid of the RIGHT side → mandible moves to the LEFT. This is because the muscle pulls the condyle forward and medially — the contralateral side moves.
🏥 Section 6 — Clinical Correlates
Trismus (Lock-Jaw)
- Definition: Inability to open the mouth due to spasm of masticatory muscles (especially masseter and medial pterygoid)
- Causes:
- Tetanus — toxin blocks inhibitory interneurons → sustained muscle spasm; “risus sardonicus” (sardonic grin from facial muscle involvement)
- Pericoronitis (inflammation around lower wisdom tooth)
- Temporomandibular joint (TMJ) disorders
- Post-extraction complication
- Parotid abscess
- Fractured mandible
- Measurement: Normal mouth opening = 35–45 mm (approximately 3 finger-breadths)
TMJ Dislocation
- Occurs when the mandibular condyle slips anterior to the articular eminence
- The lateral pterygoid is responsible — it pulls the condyle too far forward
- Patient presents with open mouth they cannot close
- Treatment: Manual reduction (Hippocratic method) — thumbs on lower molars, push down and back
Lateral Pterygoid Paralysis
- If the LEFT lateral pterygoid is paralysed:
- Jaw deviates to the LEFT on opening (towards the side of the lesion)
- Because the intact RIGHT lateral pterygoid pulls the condyle forward on the right side unopposed
- This is the basis of the clinical sign: “Jaw deviation towards the side of the V3 lesion”
Facial Nerve Palsy and Digastric
- In lower motor neuron facial nerve palsy (Bell’s palsy), the posterior belly of digastric and stylohyoid are also paralysed (in addition to facial muscles)
- This subtly affects swallowing and hyoid elevation — not usually clinically prominent but tested in anatomy MCQs
Mylohyoid Nerve Anaesthesia
- The mylohyoid nerve is a branch of the inferior alveolar nerve, given off BEFORE it enters the mandibular foramen
- Standard inferior alveolar nerve block (IANB) anaesthetises the inferior alveolar nerve INSIDE the foramen — and therefore misses the mylohyoid nerve
- This is why a lower molar may not be fully anaesthetised by IANB alone — the mylohyoid nerve can provide accessory innervation to the lower first molar
- Clinically important in dentistry
🎯 High-Yield Exam Facts
These are the specific facts that appear repeatedly across NEET PG, USMLE, AIIMS, FMGE and MDS entrance papers.
- 🔴 Digastric primary action = Depression of the mandible — when hyoid is fixed by infrahyoid muscles
- 🔴 Anterior belly of digastric = Mylohyoid nerve (V3); Posterior belly = Facial nerve (CN VII) — dual nerve supply due to dual pharyngeal arch origin
- 🔴 Lateral pterygoid = only muscle of mastication that depresses AND protrudes the mandible — all other muscles of mastication elevate the jaw
- 🔴 Most powerful elevator of the mandible = Masseter — the strongest muscle per unit cross-section in the body
- 🔴 Temporalis posterior fibres = Retrusion — the only muscle that retrudes (pulls back) the mandible
- 🟠 Geniohyoid nerve supply = C1 via hypoglossal nerve — CN XII merely transports C1 fibres; it does not innervate geniohyoid itself
- 🟠 Stylohyoid = Facial nerve (CN VII) — same as posterior belly of digastric; both are 2nd pharyngeal arch derivatives
- 🟠 All four muscles of mastication = V3 (mandibular nerve) — all are 1st pharyngeal arch derivatives
- 🟠 Jaw deviation on opening = towards the side of lateral pterygoid paralysis — because the opposite lateral pterygoid acts unopposed
- 🟠 Infrahyoid muscles (strap muscles) = Ansa cervicalis (C1–C3) except thyrohyoid = C1 via CN XII
- 🟡 Mylohyoid = forms the floor of the mouth — it is a muscular diaphragm; “mylohyoid shelf” is the lingual bony plate it sits on
- 🟡 Intermediate tendon of digastric is held to hyoid by a fibrous sling — the pulley mechanism that allows force transmission between the two bellies
- 🟡 Depression of mandible involves gravity + suprahyoid muscles + lateral pterygoid — gravity is a significant contributor to mouth opening
- 🟡 Trismus = inability to open mouth — most commonly from masseteric/pterygoid spasm; tetanus is the classic systemic cause
🧠 Mnemonics & Memory Tricks
Mnemonic 1: Digastric nerve supply — “Anterior = trigeminal (5), Posterior = facial (7)” Think: Anterior → Arch 1 → V3 (trigeminal); Posterior → Pharyngeal arch 2 → CN 7 (facial) Use it for: The most tested fact about the digastric — never mix up the nerve supplies of the two bellies
Mnemonic 2: Muscles of mastication — “My Tall Mate Loves Pterygoids” Masseter → Temporalis → Medial pterygoid → Lateral pterygoid All four supplied by V3; all derived from 1st pharyngeal arch Use it for: Remembering the complete list of muscles of mastication without missing one
Mnemonic 3: Elevators of the mandible — “MMT closes the bite” Masseter + Medial pterygoid + Temporalis = the three elevators Use it for: Quickly listing jaw-closing muscles in clinical scenario questions about trismus or bite force
Mnemonic 4: Suprahyoid muscles and nerve supplies — “Digastric Muscles Get Supplied”
- Digastric anterior → V3 (Mylohyoid nerve)
- Digastric posterior → CN VII (Facial)
- Mylohyoid → V3 (Mylohyoid nerve)
- Geniohyoid → C1 (via CN XII)
- Stylohyoid → CN VII (Facial) Use it for: The nerve supply table for all suprahyoid muscles in one sweep
Mnemonic 5: Jaw deviation — “Jaw runs away from the good side” When the lateral pterygoid is paralysed on one side, jaw deviates TOWARDS the paralysed side (away from the healthy functioning side) Use it for: Clinical scenario questions asking which way the jaw deviates in V3 or lateral pterygoid lesions
⚠️ Common Mistakes Students Make
❌ Mistake: “The digastric depresses the floor of the mouth” ✅ Reality: The mylohyoid muscle forms and elevates the floor of the mouth — it is the muscular diaphragm of the oral floor. The digastric’s primary action is depression of the mandible, not the floor. While both muscles are in the same region and share the same nerve (V3 for their relevant bellies), their primary actions are distinct. 📝 Exam trap: Option D in this MCQ was “Depressing the floor of the mouth” — placed there specifically to catch students who confuse digastric with mylohyoid. The floor of the mouth is raised (not depressed) during swallowing — by mylohyoid.
❌ Mistake: “The lateral pterygoid only protrudes the mandible” ✅ Reality: The lateral pterygoid is the most versatile of the masticatory muscles. It protrudes the mandible (both heads), assists depression (lower head pulls condyle forward during opening), and produces lateral movement (one-sided contraction moves jaw to the opposite side). It is the ONLY muscle of mastication that helps open the mouth. 📝 Exam trap: “Which muscle of mastication depresses the mandible?” — Answer: Lateral pterygoid. Students who think only suprahyoid muscles depress the jaw will miss this.
❌ Mistake: “Geniohyoid is supplied by the hypoglossal nerve (CN XII)” ✅ Reality: Geniohyoid is supplied by C1 spinal nerve fibres that travel alongside (but are not part of) the hypoglossal nerve. The hypoglossal nerve acts only as a “carrier” for these fibres. CN XII itself innervates intrinsic and extrinsic tongue muscles (except palatoglossus). This is a classic distinction in anatomy MCQs. 📝 Exam trap: “The nerve supply of geniohyoid is — (A) C1 via hypoglossal nerve (B) Hypoglossal nerve (C) Mylohyoid nerve (D) Ansa cervicalis” — Answer: A. Not B. The distinction between C1 via CN XII versus CN XII itself is the trap.
❌ Mistake: “Temporalis retrudes the mandible using all its fibres” ✅ Reality: Only the posterior fibres of temporalis retrudge the mandible. The anterior and vertical fibres of temporalis elevate the mandible. The posterior fibres run almost horizontally and pull the condyle backward. This fibre-direction distinction is tested in applied anatomy questions. 📝 Exam trap: “Which part of temporalis is responsible for retrusion?” — Answer: Posterior fibres. If the question says “temporalis” without specifying, they usually mean its role in elevation (most common action).
❌ Mistake: “Side-to-side movement is produced by medial pterygoid alone” ✅ Reality: Lateral movement of the mandible is primarily produced by the lateral pterygoid of the contralateral side. When the right lateral pterygoid contracts, it pulls the right condyle forward and medially — swinging the jaw to the LEFT. The medial pterygoid assists but is not the primary mover. The question option “side-to-side movement” for the digastric is completely wrong. 📝 Exam trap: A question about which muscle produces lateral excursion of the mandible — answer is lateral pterygoid of the opposite side, not medial pterygoid, not digastric.
🔗 How This Topic Connects to Others
Mastering the digastric and muscles of mandibular movement connects directly to these high-yield related topics:
- Facial nerve (CN VII) anatomy — The posterior belly of digastric and stylohyoid are early branches of the facial nerve; understanding the course of CN VII from the stylomastoid foramen explains their supply
- Trigeminal nerve (V3) — Mandibular division — Motor root of V3 supplies all four muscles of mastication, mylohyoid, anterior belly of digastric, tensor veli palatini, and tensor tympani — a complete list that appears in nerve lesion MCQs
- Swallowing (Deglutition) — Pharyngeal phase — Hyoid elevation by suprahyoid muscles (including digastric) is critical; connects to the complete physiology of swallowing examined in both anatomy and physiology
- Temporomandibular joint (TMJ) anatomy — The lateral pterygoid inserts into the articular disc; TMJ dislocation, clicking, and osteoarthritis are clinical applications of masticatory muscle anatomy
- Dental anaesthesia — Inferior alveolar nerve block — The mylohyoid nerve branches before the foramen, explaining failed anaesthesia; connects directly to the mylohyoid nerve (V3) supply of the anterior digastric and mylohyoid muscles
- Pharyngeal arches and their derivatives — First arch → V3 muscles (masseter, temporalis, pterygoids, mylohyoid, anterior digastric, tensor tympani, tensor veli palatini); Second arch → CN VII muscles (posterior digastric, stylohyoid, all muscles of facial expression, stapedius)
❓ The MCQ That Started This — Fully Explained
Question: The action of digastric muscle is:
- A. Depression of mandible
- B. Protrusion of mandible
- C. Side-to-side movement of mandible
- D. Depressing the floor of the mouth
✅ Correct Answer: A. Depression of mandible
Why correct: When the hyoid bone is fixed by the infrahyoid (strap) muscles, contraction of both bellies of the digastric pulls the mandible downward and backward — depressing it and opening the mouth. This is the primary clinically tested action of the digastric. Additionally, when the mandible is fixed, the digastric elevates the hyoid during swallowing — but depression of the mandible is the answer examiners expect.
Why B is wrong: Protrusion of the mandible (pushing the jaw forward) is performed by the lateral pterygoid (primary) and assisted by medial pterygoid and superficial fibres of masseter. The digastric has a slight retrusory effect (especially the posterior belly) — the exact opposite of protrusion.
Why C is wrong: Side-to-side (lateral) movements of the mandible are produced by the lateral pterygoid of the contralateral side. The digastric has no role in lateral excursion. This option is a distractor testing knowledge of which muscle performs which specific mandibular movement.
Why D is wrong: Depressing the floor of the mouth is not a recognised primary action of the digastric, and is actually physiologically incorrect — the floor of the mouth is elevated during swallowing (not depressed), and this is done by the mylohyoid muscle. The digastric lies in the same anatomical region as mylohyoid, and this option exploits that proximity to create confusion.
📝 Test Your Understanding — 5 Practice MCQs
Q1. The anterior belly of the digastric muscle is supplied by which nerve?
- A. Facial nerve (CN VII)
- B. Glossopharyngeal nerve (CN IX)
- C. Mylohyoid nerve (branch of V3)
- D. Ansa cervicalis (C1–C3)
✅ **C. Mylohyoid nerve (branch of V3)** — The anterior belly of digastric is derived from the 1st pharyngeal arch and is therefore supplied by the nerve of the 1st arch — the mandibular division of trigeminal (V3), specifically via the mylohyoid nerve (a branch of the inferior alveolar nerve). The posterior belly is supplied by CN VII (2nd arch derivative). This dual nerve supply is the most tested anatomical fact about the digastric.
Q2. A patient presents with inability to open his mouth (trismus) following a lower molar extraction. On examination, he has painful spasm of the masseter bilaterally. Which nerve, if blocked, would relax the masseter and help open the mouth?
- A. Facial nerve (CN VII)
- B. Mandibular nerve (V3)
- C. Mylohyoid nerve
- D. Ansa cervicalis
✅ **B. Mandibular nerve (V3)** — The masseter is one of the four muscles of mastication, all of which are supplied by the motor root of the mandibular nerve (V3). Blocking V3 (as in a mandibular nerve block) would abolish motor supply to masseter, temporalis, and pterygoid muscles, relaxing the spasm. The facial nerve (CN VII) supplies muscles of facial expression — not mastication. The mylohyoid nerve supplies the anterior digastric and mylohyoid, not masseter.
Q3. During swallowing, the hyoid bone is elevated. Which combination of muscles is primarily responsible for this action?
- A. Sternohyoid and omohyoid
- B. Digastric, mylohyoid, and geniohyoid
- C. Masseter and temporalis
- D. Lateral pterygoid and medial pterygoid
✅ **B. Digastric, mylohyoid, and geniohyoid** — These are suprahyoid muscles. When the mandible is fixed (teeth clenched), the suprahyoid muscles elevate the hyoid upward during swallowing. This moves the larynx superiorly and anteriorly, a critical mechanism for airway protection during deglutition. Options A (sternohyoid, omohyoid) are infrahyoid muscles that DEPRESS the hyoid — the opposite action. Masticatory muscles have no role in hyoid elevation.
Q4. A patient sustains a V3 nerve injury. On asking him to open his mouth, his jaw deviates to the right. Which muscle is most likely paralysed?
- A. Left masseter
- B. Right lateral pterygoid
- C. Left temporalis
- D. Right medial pterygoid
✅ **B. Right lateral pterygoid** — When the lateral pterygoid is paralysed on one side, the intact lateral pterygoid on the opposite side acts unopposed, pulling the condyle of that side forward. This rotates the mandible so that the chin deviates TOWARDS the paralysed side. Jaw deviates to the RIGHT → right lateral pterygoid is paralysed. Remember: “jaw deviates towards the side of the lesion” for lateral pterygoid. This is a V3 motor lesion sign.
Q5. Which of the following statements about the geniohyoid muscle is CORRECT?
- A. It is supplied by the hypoglossal nerve (CN XII) directly
- B. It is derived from the 2nd pharyngeal arch
- C. It is supplied by C1 fibres travelling with the hypoglossal nerve
- D. Its primary action is elevation of the mandible
✅ **C. It is supplied by C1 fibres travelling with the hypoglossal nerve** — Geniohyoid is a suprahyoid muscle supplied by C1 spinal nerve fibres that travel alongside (not within) the hypoglossal nerve. The hypoglossal nerve itself supplies intrinsic and extrinsic tongue muscles (except palatoglossus). Geniohyoid is derived from the occipital myotomes (not pharyngeal arches), explaining its cervical nerve supply. Its primary action is depression of the mandible and elevation/protrusion of the hyoid — not elevation of the mandible (which is performed by the muscles of mastication).
📚 References & Further Reading
- Gray’s Anatomy (41st Edition) — Chapter on Muscles of the Head and Neck: Suprahyoid and Infrahyoid Muscles; Muscles of Mastication
- BD Chaurasia’s Human Anatomy (Volume 3 — Head, Neck & Brain) — Chapter on Muscles of the Floor of the Mouth; Infratemporal Fossa and Muscles of Mastication
- Last’s Anatomy: Regional and Applied — Chapter on the Oral Cavity, Floor of Mouth, and Temporomandibular Joint
- Moore’s Clinically Oriented Anatomy — Chapter on the Head: Temporal and Infratemporal Fossae; Submandibular Region
- Snell’s Clinical Anatomy by Regions — Chapter on the Head and Neck: Muscles and Nerves of the Infratemporal Region
🚀 Ready to Master Anatomy?
You’ve just covered one of the most clinically rich and exam-dense topics in Head and Neck Anatomy. The digastric muscle alone connects pharyngeal arch development, dual nerve supply, jaw mechanics, swallowing physiology, and dental anaesthesia — all in one question cluster that can generate 5–8 MCQs in a single exam paper.
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