Post Superior Alveolar Nerve is a branch of:
**Core Concept**
The posterosuperior alveolar nerve is a small branch that provides sensory innervation to the upper molar teeth and surrounding soft tissues. It is a branch of the maxillary nerve, which is a division of the trigeminal nerve (cranial nerve V).
**Why the Correct Answer is Right**
The posterosuperior alveolar nerve arises from the maxillary nerve, which is responsible for transmitting sensory information from the face, including the upper teeth and surrounding tissues. This nerve is a branch of the trigeminal nerve, which is the fifth cranial nerve and is responsible for facial sensation, including pain, temperature, touch, and proprioception. The maxillary nerve itself is a large branch of the trigeminal nerve, which divides into three main branches: the ophthalmic, maxillary, and mandibular nerves.
**Why Each Wrong Option is Incorrect**
* **Option A:** The inferior alveolar nerve is a branch of the mandibular nerve, not the posterosuperior alveolar nerve. It provides sensory innervation to the lower teeth and surrounding tissues.
* **Option B:** The buccal nerve is a branch of the mandibular nerve, not the posterosuperior alveolar nerve. It provides sensory innervation to the cheek and surrounding tissues.
* **Option C:** The infraorbital nerve is a branch of the maxillary nerve, but it is not the posterosuperior alveolar nerve. It provides sensory innervation to the lower eyelid, nose, and upper lip.
**Clinical Pearl / High-Yield Fact**
The posterosuperior alveolar nerve is a small but important branch that can be injured during dental procedures, leading to numbness or pain in the upper molar teeth and surrounding tissues.
**Correct Answer: C. Maxillary nerve.**