MRCP UK EXAMINATIONS

Detailed explanation-1: -The latissimus dorsi muscle is a broad, flat muscle that occupies the majority of the lower posterior thorax. The muscle’s primary function is of the upper extremity but is also considered to be a respiratory accessory muscle.

Detailed explanation-2: -The latissimus dorsi is the larger, flat, dorso-lateral muscle on the trunk, posterior to the arm, and partly covered by the trapezius on its median dorsal region.

Detailed explanation-3: -Unlike teres major, which develops in the limb bud, latissimus dorsi spreads across the posterior aspect of the thorax and trunk as the myoblasts migrate out of the limb bud into the axial mesenchyme posteriorly.

Detailed explanation-4: -The latissimus dorsi (/ləˈtɪsɪməs ˈdɔːrsaɪ/) is a large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline.

Detailed explanation-5: -The anterior border of the latissimus dorsi muscle is located along a line between the posterior axillary fold and the iliac spine. In thin patients, the border of the muscle can be palpated in the direction from the humerus in an oblique line to the ribs.