광배근(latissimus dorsi)

LATISSIMUS DORSI

Origin Spine T7, spinous processes and supraspinous ligs of all lower thoracic, lumbar and sacral vertebrae, lumbar fascia, post third iliac crest, last four ribs (interdigitating with ext oblique abdominis ) and inf angle of scapula		Action Extends, adducts and med rotates arm. Costal attachment helps with deep inspiration and forced expiration
Insertion Floor of bicipital groove of humerus after spiraling around teres major		Nerve Thoracodorsal N (C6, 7, 8) (from post cord)