Back related muscles - *The origins and insertions...

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Proximal attachment (origin) Distal attachment (insertion) Innervation Main actions Trapezius medial third of superior nuchal line, spine of scapula, acromion process, motor: spinal root of Elevates, retracts, and rotates external occipital protuberance, lateral third of clavicle accessory nerve (aka scapula; superior fibers elevate, *this is a ligamentum nuchae, spinous cranial nerve 11 or XI) middle fibers retract, and superficial processes and supraspinous ligament sensory: ventral inferior fibers act together in extrinsic back of C7-T12 rami of cervical nn. superior rotation of scapula muscle (C3-C4) Latissimus spinous processes and floor of intertubercular groove of thoracodorsal nerve extends, adducts, and medially dorsi supraspinous ligament of inferior humerus (between insertions of rotates humerus; raises body *this is a six thoracic vertebrae, pectoralis major and teres major) towards arms during climbing superficial thoracolumbar fascia, iliac crests, *sometimes it attaches to the extrinsic back and lower three or four ribs inferior angle of the scapula muscle Rhomboid major spinous process and supraspinous medial border of scapula from level dorsal scapular nerve retracts scapula and rotates it *superficial ligaments (T2-T5 vertebrae) of spine inferior to inferior angle to depress glenoid cavity; fixes extrinsic back m. scapula to thoracic wall. Rhomboid minor lower portion of ligamentum nuchae, medial border of scapula at level dorsal scapular nerve retracts scapula and rotates it *superficial spinous processes (C7 and T1 of root of scapular spine to depress glenoid cavity; fixes extrinsic back m. vertebrae) scapula to thoracic wall. Levator scapulae posterior tubercles of transverse superior part of medial border of ventral rami of cervical if neck is stabilized: elevate processes (C1-C4 vertebrae) scapula n. (C3-C4), and dorsal scapula, rotate point of scapular nerve (C5) shoulder down If scapula stabilized: bilaterally- extend neck; unilaterally- lateral flex and rotate neck to same side Serratus posterior ligamentum nuchae and spinous posterior borders of second ventral rami of 2nd to aids respiration, elevates superior processes and supraspinous ligament through fourth ribs 5th intercostal nerves second through fourth ribs (C7-T3) (T2-T5) Muscle Proximal attachment (origin) Distal attachment (insertion) Innervation Main actions Serratus posterior spinous processes and inferior borders of 8th to 12th ribs ventral rami of thoracic aids respiration, lowers inferior supraspinous ligament of T11-L2 near the angles spinal nn. (T9-T12) (aka 8th through 12th ribs vertebrae lower three intercostal *The origins and insertions represent what normally happens. They may flip in unusual body positions. ( C6, C7
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This note was uploaded on 04/08/2008 for the course GROSS ANAT 1 taught by Professor Mcgerk! during the Spring '08 term at Texas Chiropractic.

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Back related muscles - *The origins and insertions...

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