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Sternocleidomastoid muscle. In human anatomy, the sternocleidomastoid muscle (/ËstÉËrnoÊËklaÉªdÉËmÃ¦sËtÉÉªd, -nÉ-, -doÊ-/), also known as sternomastoid and commonly abbreviated as SCM, is a paired muscle in the superficial layers of the side of the neck. It is one of the largest and most superficial cervical muscles.
The temporalis muscle is one of the 4 muscles of mastication (so called as they are involved in the process of chewing). This is a fan-shaped muscle that originates at the inferior temporal line and passes behind the zygomatic arch to insert at the coronoid process and anterior sruface of the ramus of the mandible.When the entire muscle contracts the lower jaw is raised closing the jaw.rigin of the mentalis muscle. The mentalis muscle is a conical-shaped muscle which arises from the incisive fossa of the mandible and inserts at the skin of the chin. This muscle is used when pouting by lifting the chin and protruding the lower lip.