**Question:** Otic ganglion supplies

**Core Concept:** Otic ganglion is a component of the facial nerve (cranial nerve VIII) that plays a crucial role in the parasympathetic innervation of the inner ear.

**Why the Correct Answer is Right:** The otic ganglion is a part of the facial nerve (CN VIII), which supplies sensory, motor, and parasympathetic functions to the inner ear. In particular, it contributes to the parasympathetic innervation of the inner ear, particularly the cochlea and the vestibular apparatus.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect:** Otic ganglion is not responsible for supplying the vestibulocochlear nerve (CN VIII). The vestibulocochlear nerve is the entire nerve that includes both the sensory and motor components, whereas the otic ganglion focuses on parasympathetic innervation of the inner ear.

B. **Incorrect:** The otic ganglion does not supply the tympanic membrane or the auditory nerve (CN VIII). The tympanic membrane is supplied by the auriculotemporal nerve, which is a branch of the mandibular division of the trigeminal nerve (CN V), while the auditory nerve consists of the cochlear and vestibular nuclei and is responsible for hearing and balance functions.

C. **Incorrect:** The otic ganglion does not supply the parotid gland or the mandibular division of the trigeminal nerve (CN V). The parotid gland is supplied by the facial nerve (CN VII), while the mandibular division of the trigeminal nerve (CN V) innervates the mandibular muscles, including masseter and temporalis muscles, not the otic ganglion.

D. **Incorrect:** The otic ganglion does not supply the mandibular nerve (CN V3) or the stapedius muscle. The mandibular nerve (CN V3) is a branch of the trigeminal nerve that supplies the mandibular muscles and innervates the mandibular region, while the stapedius muscle is innervated by the accessory ganglion, which is a part of the sympathetic system and is located in the tympanic plexus, not the otic ganglion.

**Core Concept:** The otic ganglion is a part of the parasympathetic system and functions to supply the internal auditory meatus and the vestibulocochlear nerve (CN VIII). The vestibulocochlear nerve is responsible for the sensory functions of hearing and balance and is supplied by the otic ganglion.

**Core Concept:** The otic ganglion is a part of the parasympathetic system, which is responsible for the innervation of the inner ear. It plays a crucial role in the sensory functions of hearing and balance, specifically the vestibulocochlear nerve (CN VIII).

**Clinical Pearls:** The otic ganglion contributes to the parasympathetic innervation of the inner ear