Name

# Latissimus Dorsi

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