Posterior Perspective Of The Serratus Anterior

Description

Seen from a posterior perspective, the serratus anterior is highlighted as it wraps from the lateral thoracic wall onto the deep (costal) surface of each scapula, with its digitations arising from the external surfaces of the upper ribs and intercostal spaces. Medially, the thoracic spinous processes and posterior rib angles establish the midline and rib cage contours, while each scapula sits posterolaterally, gliding over the ribs rather than articulating with them. Along the medial border of the scapula, the serratus anterior occupies the interface between scapula and thoracic wall, opposing the rhomboid major and minor, which lie more posteriorly and insert along that same border. Orientation is unambiguous. Functionally, this posterior view clarifies why serratus anterior weakness produces scapular winging: loss of protraction and inadequate fixation of the medial border against the thorax become obvious when you picture the muscle’s broad, fan-like attachment on the costal surface of the scapula. Clinically, the illustration supports teaching around long thoracic nerve (C5 to C7) injury, commonly after axillary surgery, chest tube placement, or blunt lateral thoracic trauma, where patients struggle with forward elevation beyond 90 degrees due to impaired upward rotation. The relationship to the ribs also helps explain why serratus dysfunction can mimic shoulder pathology while the glenohumeral joint remains structurally intact. Use this artwork in gross anatomy or kinesiology modules on scapulothoracic mechanics, in surgical education discussing nerve-sparing approaches in the axilla, or in rehab materials for diagnosing and cueing serratus anterior activation during closed-chain protraction work. It also reads well in orthopedic and sports medicine publications covering scapular dyskinesis and winging patterns. Anatomical accuracy verified by SciePro's Medical Advisory Board.