Posterior Full Body View of the Infraspinatus Beneath the Skin

Description

Emerging across the posterior scapula, the infraspinatus occupies the infraspinous fossa inferior to the scapular spine, its fibers converging laterally toward the greater tubercle of the humerus as part of the rotator cuff. Superficial to it lie the posterior deltoid laterally and the trapezius and posterior shoulder fascia medially, while teres minor runs along its inferior lateral border and teres major sits more inferiorly near the posterior axillary fold. Midline landmarks of the back, including the spinous processes of the cervical and thoracic vertebrae, help orient the scapulae and the posterior shoulder girdle in anatomical position. Bony contours remain readable beneath the semi-transparent soft tissues. Clinically, this posterior relationship is the one you need when teaching external rotation strength testing and when explaining why isolated infraspinatus atrophy points to suprascapular nerve compromise at the spinoglenoid notch rather than the suprascapular notch. A frequent pattern. The view also supports discussions of posterosuperior rotator cuff tears, where retraction toward the scapula and loss of external rotation strength correlate with tendon involvement at the greater tubercle and with altered scapulohumeral rhythm. Faculty commonly use this full-body posterior context in gross anatomy and kinesiology labs to tie the shoulder musculature to axial landmarks and overall posture, while orthopedics and sports medicine authors use it to illustrate posterior shoulder pain generators and the surface anatomy used for palpation and targeted rehabilitation. Physical therapy and athletic training materials can pair it with goniometry and resisted testing figures for shoulder external rotation and horizontal abduction. Anatomical accuracy verified by SciePro's Medical Advisory Board.