Question

multiple choice question

onto which part of the sternum does the sternocleidomastoid muscle attach?

manubrium
body
xyphoid process

Explanation:

Identify the muscle and its attachments

Using the Sternocleidomastoid Muscle and Neck Anatomy knowledge points

The sternocleidomastoid muscle is a prominent paired muscle in the superficial layer of the anterior portion of the neck. Its name directly reflects its anatomical attachments:

• Sterno-: refers to the sternum (specifically, the anterior surface of the manubrium of the sternum).
• Cleido-: refers to the clavicle (specifically, the medial third of the clavicle).
• Mastoid: refers to the mastoid process of the temporal bone of the skull (its insertion point).

Determine the correct part of the sternum

The sternum consists of three main parts: the manubrium (superior portion), the body (middle portion), and the xiphoid process (inferior portion). The sternal head of the sternocleidomastoid muscle originates specifically from the upper anterior surface of the manubrium. Therefore, the correct option is "Manubrium".

Answer:

• Manubrium (Correct answer)
• Body
• Xyphoid process