HelppVersion en ligne Helpp par Emily Coates 1 Trapezius 2 Levator Scapulae 3 Rhomboid Muscles 4 Deltoid Origin: midline of back (occipital protuberance and spinous processes of C7-12) Insertion: lateral 1/3 of clavicle, acromion and spine of scapula Innervation: cranial nerve XI, C3, C4 Action: rotates scapula to elevate arm. also elevates. depresses and retracts scapula. extends and rotates head Origin: transverse processes of C1-C4 Insertion: upper medial border of scapula Innervation: C3. 4 and dorsal scapula nerve (C4, 5) Action: elevates scapula Origin: spinous processes of C7 (minor) and T2-5 (major) Insertion: medial edge of scapula at (minor) and below (major) scapula spine Innervation: dorsal scapular nerve (C4-5) Action: elevates and retracts scapula Origin: clavicle and scapula (opposite trapezius) Insertion: deltoid tuberosity of humerus Innervation: axillary nerve (C5-6) Action: powerful abduction of arm beyond 15 degrees
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