The following which correctly states the proximal and distal attachments of the sternocleidomastoid include:
This is also known as musculus sternocleidomastoideus and is the superficial muscle present in the neck region. This thick and narrow muscle is also solely responsible for the division of the neck into what is referred to as anterior and posterior triangles.
The proximal and distal attachment of this muscle can be seen in the sternal manubrium and mastoid process and are responsible for certain actions such as rotation of the head etc.
This is therefore the reason why the aforelisted was chosen as the most appropriate choice.
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