Latissimus dorsi origins include which of the following structures?

Latissimus dorsi origins include which of the following structures?

• A. Spinous processes of T6-L5; Thoracolumbar fascia; Iliac crest
• B. Thoracolumbar fascia; Iliac crest
• C. Spinous processes of T6-L5
• D. Clavicle

Answer: (A)

Latissimus dorsi has a broad, multi‐part origin anchored to the back and pelvis, which underpins its powerful pulling action on the arm. It arises from the spinous processes of the lower thoracic and upper lumbar vertebrae (typically around T6–L5), from the thoracolumbar fascia, and from the iliac crest. This combination gives a wide base that runs upward to insert on the intertubercular groove of the humerus, enabling extension, adduction, and medial rotation of the arm. The clavicle does not contribute to its origin.

Latissimus dorsi has a broad, multi‐part origin anchored to the back and pelvis, which underpins its powerful pulling action on the arm. It arises from the spinous processes of the lower thoracic and upper lumbar vertebrae (typically around T6–L5), from the thoracolumbar fascia, and from the iliac crest. This combination gives a wide base that runs upward to insert on the intertubercular groove of the humerus, enabling extension, adduction, and medial rotation of the arm. The clavicle does not contribute to its origin.