**Question:** The posterior belly of the digastric muscle is supplied by the:

A. Facial artery
B. Auriculotemporal artery
C. Superficial temporal artery
D. Stylohyoid artery

**Core Concept:**
The posterior belly of the digastric muscle is one of the cervical muscles. It is a part of the deeper layer of the deep cervical fascia and is responsible for the depressor action of the mandible. It is innervated by the mylohyoid nerve, which is a branch of the mandibular division of the trigeminal nerve.

**Why the Correct Answer is Right:**
The correct answer, D. Stylohyoid artery, is chosen because it is a branch of the external carotid artery. The external carotid artery is the primary source of blood supply to the muscles of the anterior neck and the hyoid region, which includes the posterior belly of the digastric muscle.

**Why Each Wrong Option is Incorrect:**
A. Facial artery (A): The facial artery supplies the muscles of facial expression and does not innervate or supply the muscles of mastication like the posterior belly of the digastric muscle.
B. Auriculotemporal artery (B): The auriculotemporal artery supplies the temporalis muscle and does not supply the posterior belly of the digastric muscle.
C. Superficial temporal artery (C): The superficial temporal artery supplies the skin on the temporal region and does not supply the posterior belly of the digastric muscle.

**Clinical Pearl:**
In clinical practice, this understanding is crucial for surgeons and anesthesiologists when planning surgical procedures or administering anesthesia in the neck region. The knowledge of the arterial supply to various muscles helps to avoid complications such as injury to essential structures during surgeries or regional anesthesia.