Questions: Which of the following muscles has 2 heads: orbicularis oculi sternocleidomastoid orbicularis oris platysma

Which of the following muscles has 2 heads: orbicularis oculi sternocleidomastoid orbicularis oris platysma
Transcript text: Which of the following muscles has 2 heads: orbicularis oculi sternocleidomastoid orbicularis oris platysma
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Solution

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The answer is the second one: sternocleidomastoid.

Explanation for each option:

  1. Orbicularis oculi: This muscle encircles the eye and is responsible for closing the eyelids. It does not have two heads; it is a circular muscle.

  2. Sternocleidomastoid: This muscle has two heads. It originates from the manubrium of the sternum (sternal head) and the clavicle (clavicular head) and inserts on the mastoid process of the temporal bone. It is responsible for rotating and flexing the neck.

  3. Orbicularis oris: This muscle encircles the mouth and is responsible for movements of the lips. It does not have two heads; it is a circular muscle.

  4. Platysma: This is a superficial muscle that covers the neck and is involved in facial expressions. It does not have two heads.

In summary, the sternocleidomastoid is the muscle with two heads.

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