- May 2, 2026The serratus posterior muscles are thin quadrilateral muscles of the intermediate back layer beneath the rhomboids and trapezius, lying between…
- May 2, 2026The sternalis is an anomalous superficial chest wall muscle running vertically on the anterior chest, parallel to the lateral sternum…
- May 2, 2026The transversus thoracis (sternocostalis) is a thin muscle on the inner surface of the anterior thoracic wall, continuous inferiorly with…
- May 2, 2026The subcostales are thin, flat muscles on the inner surface of the lower thoracic cage, running from the angle of…
- May 2, 2026The rotatores are the deepest of the transversospinalis group, spanning one or two vertebral levels in the thoracic spine. Despite…
- May 2, 2026The rhomboid major is the larger of the two rhomboids, retracting the scapula and rotating the glenoid inferiorly. Weakness of…
- May 2, 2026The rhomboid minor is the smaller, more superior rhomboid, inserting at the root of the scapular spine. Together with the…
- May 2, 2026Serratus anterior is the key muscle holding the scapula against the thorax and rotating it upward for arm elevation. Long…
- May 2, 2026The subclavius is a small muscle tucked between the first rib and the clavicle, depressing the clavicle and acting as…
- May 2, 2026Pectoralis minor is the key muscle producing anterior scapular tilt (inferior angle lifted away from the thorax), which reduces the…