Muscles 1-9

Muscles 1-9 - • Action elevates medial border of scapula...

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Muscles 1-9
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Trapezius Origin: Superior nuchal line, external occipital protuberance, spinous processes of thoracic vertebrae Insertion: Upper – lateral clavicle; middle – acromion; lower – medial scapular spine Action: Elevates, retracts, and depresses scapula Innervation : Accessory (11 th cranial nerve, C3, C4)
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Latissimus Dorsi Origin: spinous processes of T6-S5 Insertion: Bicipital groove of humerus Action: extension, abduction, IR of arm Innervation : thoracodorsal nerve
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Rhomboid Major Origin: spinous processes of T2-T5 Insertion: Medial border of scapula Action: retracts and stabilizes scapula Innervation : dorsal scapular nerve
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Rhomboid Minor Origin: spinous processes of C7-T1 Insertion: Medial border of scapula Action: retracts and stabilizes scapula Innervation : dorsal scapular nerve
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Levator Scapulae Origin: Transverse processes of C1-C4 Insertion: Medial border of scapula above spine
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Unformatted text preview: • Action: elevates medial border of scapula • Innervation : dorsal scapular nerve Pectoralis Major • Origin: Clavicular part-medial half of clavicle Sternal part-lateral border of sternum • Insertion: Bicipital groove of humerus • Action: Adduct, medially rotate arm • Innervation : medial and lateral pectoral nerves Pectoralis Minor • Origin: 3 rd , 4 th , and 5 th ribs • Insertion: corocoid process of scapula • Action: draws scapula forward and downward • Innervation : medial pectoral nerve Subclavius • Origin: medial border of 1 st rib • Insertion: under- surface of clavicle • Action: depresses and stabilizes clavicle • Innervation : C5, C6 Serratus Anterior • Origin: Outer surface of first eight ribs • Insertion: Anterior surface of the medial border of scapula • Action: protracts scapula • Innervation : long thoracic nerve...
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This note was uploaded on 06/26/2008 for the course EXSS 175 taught by Professor Zinder during the Summer '08 term at UNC.

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Muscles 1-9 - • Action elevates medial border of scapula...

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