Latissimus dorsi muscle is a very wide muscle extending on the lateral wall of the thorax from the dorso-lumbar spine to the arm. It has an aponeurotic origin, which is succeeded by a wide muscular portion.
Origin: Lumbodorsal fascia, 11 th and 12 th ribs and fascia over the intercostal and external oblique muscles.
Insertion: The anterior part in common with the teres major to the medial (teres) tubercle of the humerus; the middle part to the aponeurosis on the deep face of the long head of triceps; the posterior part along with the deep pectoral to the medial tuberosity of the humerus. The tensor fasciae antibrachii originates from the lateral surface of this muscle.
