Back stair

Posterior staircase , m. Scalenus posterior, begins from the posterior tubercles of the V-VI (sometimes protruding) cervical vertebrae, is directed down behind the middle staircase and is attached to the outer surface
II edges.

Function: with a strengthened spinal column, the second rib rises; With a strengthened thorax and bilateral cuts, tilts the cervical spine forward.

Innervation: nn. Cervicales (C7-C8).

Blood supply: aa. Cervicalis profunda et transversa colli, intercostalis posterior I (truncus costocervicalis).

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