Latissimus dorsi origin includes which of the following?

• A. Inferior angle of scapula
• B. Spinous processes of last six thoracic vertebrae
• C. Last three or four ribs
• D. Inferior angle of scapula, spinous processes of last six thoracic vertebrae, last three or four ribs, thoracolumbar aponeurosis and posterior iliac crest

Answer: (D)

Latissimus dorsi has a broad, multi-site origin that anchors it along the lower back and pelvis, which lets it pull the arm downward and back efficiently. The most complete way to describe its origin includes several attachment points: the inferior angle of the scapula, the spinous processes of the lower six thoracic vertebrae, the last three or four ribs, the thoracolumbar aponeurosis (thoracolumbar fascia), and the posterior part of the iliac crest. This combination provides a wide anchor for the muscle, explaining its strong actions on the arm—extension, adduction, and medial rotation—as well as its role when the arm is fixed, in aiding trunk movement. The other options mention only one or a subset of these origins, which doesn’t capture the full attachment pattern of the latissimus dorsi.