Front staircase

Anterior staircase , m. Scalenus anterior, starts from anterior tubercles of III-VI cervical vertebrae, directed downward and forward and attached to tuberculum m. Scaleni anterioris I ribs.

Function: with a strengthened spine, I pull the rib upward; With a strengthened thorax and one-sided cutting, tilts the cervical spine to his side, and with bilateral contraction - forward.

Innervation: nn. Cervicales (C5-C7).

Blood supply: aa. Cervicalis ascendens, thyroidea inferior.

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