Latissiumus Dorsi originates off the spine and winds under the arm pit to the anterior surface of the humerus. Looking at the line of pull on this muscle, what actions would be involved when contracted?

Answer GH joint movements of adduction, extension, hyperextension, horizontal abduction and inward rotation.

Origin = Spinous processes of last six thoracic vertebrae and all lumbar vertebrae; posterior surface of the sacrum, iliac crest; lower three ribs.

Insertion = Anterior surface of the humerus, parallel to the tendon of the pectoralis major.