Name
Pronunciation
(luh-TIS-uh-mus DOR-si)
Origin/Proximal Attachment
Spinous processes of T7-L5, supraspinous ligament, upper2-3 sacral segments, iliac crest, lower 3-4 ribs, inferior angle of scapula
Insertion/Distal Attachment
Floor of the bicipital groove of the humerus
Action/Relevance
Extension of the arm (from a flexed position) Internal rotation of the armAdduction of the arm4. Downward rotation of the scapula
Innervation
Thoracodorsal nerve, C6, 7,8