Latissiumus Dorsi

Question 1

Origins of Latissimus dorsi

Answer 1

• SPs: T7-T12, all LV, all SV
• posterior part of iliac crest
• from lower 3-4 ribs via muscular slips that interdigitate with external oblique muscle

Question 2

Insertions of Latissimus dorsi

Answer 2

Crest of lesser tubercle
Floor of bicipital groove of humerus

Question 3

Innervation of Latissimus dorsi

Answer 3

Thoracodorsal nerve (posterior cord of brachial plexus, C6-C8 fibers)

Question 4

Blood supply of Latissimus dorsi

Answer 4

Thoracodorsal artery (branch of subscapular artery)

Question 5

Action of Latissimus dorsi

Answer 5

Extension, medial rotation, adduction of arm