What is the origin of the sternocleidomastoid?

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Prepare for the NHI Eastern Kinesiology Test with our comprehensive quiz. Utilize flashcards and multiple-choice questions, complete with hints and detailed explanations. Ready yourself for success!

Multiple Choice

What is the origin of the sternocleidomastoid?

Explanation:
Two-headed origin. The sternocleidomastoid starts with two separate attachment points: the sternal head from the anterior surface of the manubrium of the sternum and the clavicular head from the superior surface of the medial third of the clavicle. Together, the muscle’s origin is at the top of the manubrium and the medial part of the clavicle. That matches the description “top of manubrium, medial 1/3 of clavicle.” The other options misidentify the origin: the lateral part of the clavicle isn’t where SCM begins, the xiphoid process is far below and unrelated, and noting the manubrium alone omits the clavicular portion.

Two-headed origin. The sternocleidomastoid starts with two separate attachment points: the sternal head from the anterior surface of the manubrium of the sternum and the clavicular head from the superior surface of the medial third of the clavicle. Together, the muscle’s origin is at the top of the manubrium and the medial part of the clavicle. That matches the description “top of manubrium, medial 1/3 of clavicle.” The other options misidentify the origin: the lateral part of the clavicle isn’t where SCM begins, the xiphoid process is far below and unrelated, and noting the manubrium alone omits the clavicular portion.

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