Serratus Anterior as, Lateral View

Description

Running along the lateral thoracic wall, the serratus anterior is rendered as a series of finger-like digitations arising from the external surfaces of the upper ribs, then sweeping posteriorly to meet the costal (anterior) surface of the scapula. Rib contours and costal spaces remain visible beneath the muscle slips, with the thoracic vertebrae and posterior rib angles shown posteriorly and the superior pelvis included inferiorly for orientation. From this lateral perspective, the serratus sits superficial to the rib cage and deep to where pectoral and axillary soft tissues would normally overlie it. Fiber direction reads inferoposterior from rib origins toward the scapular attachment. Clinically, this view matters because serratus anterior function is best understood in profile: it protracts the scapula, holds the medial border against the thoracic wall, and contributes to upward rotation during arm elevation. Long thoracic nerve palsy, often iatrogenic after axillary surgery or from traction in contact sports, produces medial scapular winging that becomes obvious during a wall push-up. Clean visualization of the rib-based digitations also helps clarify why pain along the lateral chest wall can accompany serratus strain in overhead athletes and why injections or surgical approaches near the mid-axillary line must respect the long thoracic nerve’s superficial course on the muscle. Ideal for anatomy and kinesiology teaching on scapulothoracic mechanics, as well as for surgical education in breast, axillary, and thoracic wall procedures where identifying serratus anterior planes guides safe dissection. Publishers can pair it with shoulder girdle chapters to explain winged scapula, scapular dyskinesis, and the anatomic basis of long thoracic nerve injury. Anatomical accuracy verified by SciePro's Medical Advisory Board.