ANATOMY- SUPERFICIAL BACK MUSCLES, Lecture notes of Anatomy

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CENTRO ESCOLAR UNIVERSITY SCHOOL OF MEDICINE (ANATOMY) SUPERFICIAL BACK SUPERFICIAL BACK MUSCLES * TRAPEZIUS _ * The superior fibers elevate the scapula == (eg, when squaring the shoulders), sss the middle fibers retract the scapula. Se=e~ (ie, pull it posteriorly), the inferior fibers depress the scapula and lower the shoulder, * Nerve supply is spinal accessory nerve sw (motor fibers) and C3, C4 spinal nerves (pain and proprioceptive“ fibers). * LEVATOR SCAPULAE * The levator scapulae elevates scapula, * Nerve supply isthe dorsal scapular nerve and C3, C4 spinal nerves, CUTANEOUS INNERVATION * The spinal nerves, as they emerge from the intervertebral foramina of the vertebral column, divide into anterior rami and posterior rami. * The cutaneous innervation of the back is derived from the posterior rami of spinal nerves. * LATISSIMUS DORSI * The ltissimus dosi extends, adducts, and medially rotates arm; raises body toward arms, as in hin-ups or climbing a tree, * Nerve supply is thoracodorsal nerve,