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Superfic Back Musc

Origin, Insertion, Innervation of Superficial Back Muscles

QuestionAnswer
Trapezius O: External occipital protuberance, medial portion superior nuchal line of occiput, ligamentum nuchae, & spinous processes of c-7 through t-12 I: Lateral 1/3 clavicle, acromion & spine of scapula N: Cranial accessory nerve XI & ventral ramus C2, 3, 4
Latissimus Dorsi O: Inferior angle of scapula, spinous processes of last 6 thoracic vert., last 3 or 4 ribs, thoracolumbar aponeurosis and posterior iliac crest I: intertubercular groove of humerus N: Thoracodorsal C6, 7, 8
Rhomboid Minor O: Spinous Processes of C-7 and T-1 (Minor) I: Upper portion of medial border of scapula, across from spine of scapula N: Dorsal scapular C4, 5
Rhomboid Major O: spinous processes of T-2 to T-5 I: Medial border of scapula between the spine of scapula and inferior angle N: Dorsal scapular C4, 5
Levator Scapula O: Transverse Processes of C1-C4 I: Medial border of scapula, between superior angle and superior portion of spine of scapula N: Cervical 3, 4, and dorsal scapular 4, 5
Trapezius upper fibers action 1) Extend the head and neck 2) Laterally flex the head and neck to the same side 3) Rotate the head and neck to the opposite side 4) Elevate the scapula 5) Upwardly rotate the scapula
Trapezius middle fibers action 1) Adduct the scapula 2) Stabilize the scapula
Trapezius lower fibers action 1) Depress the scapula 2) Upwardly rotate the scapula
Latissimus Dorsi action 1) Extend the shoulder 2) Adduct the shoulder 3) Medially Rotate the shoulder
Rhomboid Major and Minor action 1) Adduct the scapula 2) Elevate the scapula 3) Downwardly rotate the scapula
Levator Scapula 1) Elevate scapula 2) Downwardly rotate scapula 3) Laterally flex head and neck 4) Rotate head and neck to the same side
Created by: aublynn2010