Upper Body

Description

Posterior upper trunk anatomy is rendered with the superficial back musculature draped over the thoracic cage, including trapezius spanning from the occipital region and nuchal ligament to the scapular spine, and latissimus dorsi sweeping inferolaterally toward its humeral insertion. Over the shoulder girdle, the deltoid caps the glenohumeral region while infraspinatus and teres minor occupy the posterior scapula, with teres major forming the inferior border of the quadrangular space. Color-coded peripheral nerves course laterally into the upper limb alongside accompanying arteries and veins, tracking through the posterior axillary region and around the scapular borders. Relationships are clear. Clinically, this posterior perspective maps the corridors used in nerve and vessel injury around the scapula and proximal arm, where traction or compression can affect the suprascapular nerve at the suprascapular notch and the axillary nerve as it passes through the quadrangular space with the posterior circumflex humeral artery. The arrangement of trapezius, rhomboid region, and scapular stabilizers also supports assessment of scapular dyskinesis and accessory nerve palsy, where trapezius weakness alters scapular position and shoulder abduction mechanics. Surface anatomy meets neurovascular risk. Use this illustration in gross anatomy and kinesiology teaching to anchor posterior thorax and shoulder-girdle relationships, or in orthopaedics and sports medicine materials discussing rotator cuff pathology, scapular stabilizer dysfunction, and posterior shoulder approaches. It also suits patient-facing education on sites of entrapment neuropathy and referral patterns in the upper back and shoulder. Anatomical accuracy verified by SciePro's Medical Advisory Board.