The Structure of Lats.
The latissimus dorsi and the teres major are two distinct muscles of the lower and middle back. They work synergistically in movements involving arm extension, retraction, internal rotation, and shoulder adduction.
Latissimus Dorsi :
The latissimus dorsi is the largest muscle in the back and extends over a significant portion of the lumbar, thoracic, and sacral regions of the spine. It originates from the iliac crest, lower lumbar vertebrae, upper thoracic vertebrae, and the thoracolumbar fascia. The muscle fibers of the latissimus dorsi converge to form a wide tendon that attaches to the minor tubercle of the humerus, near the shoulder joint.
Teres Major :
The teres major is a muscle located beneath the latissimus dorsi. It attaches to the medial side of the scapula at the infraspinous fossa, situated below the supraspinous fossa to which the latissimus dorsi attaches. It then inserts into the humerus, specifically on the medial part of the medial surface of the humerus, just below the minor tubercle.
Video illustration
Main exercices
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