Sternocleidomastoid is supplied by all of the following aery except
**Core Concept**
The sternocleidomastoid muscle is a key structure in the neck, and its blood supply is crucial for its function and innervation. The sternocleidomastoid muscle is supplied by branches from the occipital artery, the posterior branch of the inferior thyroid artery, and the superficial cervical plexus.
**Why the Correct Answer is Right**
The sternocleidomastoid muscle receives its blood supply from multiple sources, including the occipital artery, which provides the primary supply to the superior part of the muscle. The posterior branch of the inferior thyroid artery supplies the inferior part of the muscle. The superficial cervical plexus, which arises from the anterior rami of C2-C4, also contributes to the blood supply of the muscle. Therefore, the correct answer should be an artery that does not contribute to the blood supply of the sternocleidomastoid muscle.
**Why Each Wrong Option is Incorrect**
**Option A:** The occipital artery is a common source of blood supply to the sternocleidomastoid muscle, making this option incorrect.
**Option B:** The posterior branch of the inferior thyroid artery is another source of blood supply to the sternocleidomastoid muscle, eliminating this option.
**Option D:** The superficial cervical plexus contributes to the blood supply of the sternocleidomastoid muscle, making this option incorrect.
**Clinical Pearl / High-Yield Fact**
The sternocleidomastoid muscle receives its blood supply from multiple sources, making it resistant to ischemia. However, it is still susceptible to injury from trauma or surgical procedures, highlighting the importance of preserving its blood supply.
**Correct Answer: C.**