The superficial and deep epimysia are continuous with an investing deep fascia that encircles the neck and also contains both sternocleidomastoid muscles.
They are autotransplanted to the nearby sternocleidomastoid muscle, or to the forearm so that another intervention would be less risky.
Uncommonly, the lower sternocleidomastoid branch can branch directly from the external carotid.
It is located in the neck, deep to sternocleidomastoid.
Inhalation is aided by use of external intercostals, scalenes and sternocleidomastoid muscles.
The sternocleidomastoid (elevated sternum) and the scalene muscles (anterior, middle and posterior scalene) are typically considered accessory muscles of breathing.
The posterior surface of the sternocleidomastoid muscle is labeled.
The sternocleidomastoid muscle is tested by asking the patient to turn their head to the left or right against resistance.
