Ascending pharyngeal aery is branch of
**Core Concept**
The ascending pharyngeal artery is a small but important branch of the pharyngeal arteries, which supply the pharynx and surrounding structures. It is one of the several arteries that arise from the external carotid artery, which is a major artery supplying the head and neck.
**Why the Correct Answer is Right**
The ascending pharyngeal artery is unique in that it is the only artery that arises from the external carotid artery and passes through the carotid sheath. This makes it a branch of the external carotid artery. It then ascends through the carotid sheath, giving off branches to the pharynx, the meninges, and the muscles of the neck.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the ascending pharyngeal artery does not arise from the subclavian artery, which is a major artery supplying the arm and chest.
**Option B:** This option is incorrect because the ascending pharyngeal artery does not arise from the internal carotid artery, which is a major artery supplying the brain.
**Option C:** This option is incorrect because the ascending pharyngeal artery does not arise from the vertebral artery, which is a branch of the subclavian artery and supplies the posterior part of the brain.
**Clinical Pearl / High-Yield Fact**
The ascending pharyngeal artery is a branch of the external carotid artery and is the only artery that arises from the external carotid artery and passes through the carotid sheath. This makes it a key landmark for surgeons during neck dissections.
**Correct Answer: D. External carotid artery**