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Muscle: Latissimus dorsi (Musculus latissimus dorsi)

Attachments: Origin & Insertion
Origin: (proximal attachment)
a. Spinous process of the lower six thoracic vertebrae, lumbar vertebrae, and sacrum.
b. Iliac crest.
c. Thoracolumbar fascia.
d. Inferior angle of the scapula.
e. Lower three or four ribs.

Insertion: (distal attachment)
a. Floor of intertubercular (bicipital) groove of humerus.

a. Adducts the arm at the shoulder (glenohumeral) joint.
b. Medially rotates the arm at the shoulder (glenohumeral) joint.
c. Extends the arm at the shoulder (glenohumeral) joint.

Nerves & Nerve Roots:
a. Thoracodorsal nerve.
a. C6, C7, and C8.

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Subscapularis Muscle