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Lateral muscles of the cervical ...


Description

With the evolutionary changes accompanying the neck in vertebrates, the lateral muscle layers lose their sheet-like appearance to become strap-like muscles of the tapered neck. The scalene muscles, attaching to the costal homologues, or ribs, of the cervical vertebrae, comprise the inner three layers of the four-layered lateral muscle wall. (The outermost fourth layer, the levator scapulae, is one of the body wall muscles that migrate onto the scapula to support the superior limb. See muscles of the pectoral girdle for more on this muscle.) Additionally, short intersegmental intertransversarii muscles also form representative parts of the lateral wall musculature.

Muscles Included

Anterior scalene, Middle scalene, Posterior scalene, and Levator scapulae.

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