Muscles and Bones of the Upper Body, Gross Anatomy

Description

Posterior trunk and shoulder girdle anatomy is rendered in an adult male, with superficial musculature laid over key bony landmarks of the axial skeleton and upper limb. Superiorly, the trapezius spans from the occipital region and nuchal ligament to the lateral clavicle, acromion, and spine of the scapula, lying superficial to the levator scapulae and rhomboid region and framing the posterior triangle of the neck. Inferior and lateral to it, the latissimus dorsi courses superolaterally toward the intertubercular sulcus of the humerus, forming the posterior axillary fold with teres major, while the deltoid caps the glenohumeral joint and the triceps brachii descends along the posterior humerus toward the olecranon. Along the midline, the erector spinae columns run longitudinally adjacent to the spinous processes, with the external oblique visible more laterally on the abdominal wall. Posterior shoulder views matter when you need clean spatial relationships between the scapula, rotator cuff region, and the posterior compartment of the arm, because many pain patterns and surgical corridors track along these planes. The infraspinatus and teres minor occupy the infraspinous fossa and lateral border of the scapula, respectively, and their tendinous insertions on the greater tubercle become clinically relevant in rotator cuff tears and in differentiating weakness of external rotation from deltoid dysfunction. Clear landmarks. Think also of posterior approaches for scapular fracture fixation, or safe placement of intramuscular injections away from the axillary nerve and posterior circumflex humeral artery near the surgical neck. Use this plate for gross anatomy teaching of the back and shoulder girdle, for orthopedic or sports medicine content on rotator cuff pathology and scapulothoracic mechanics, or for surgical education illustrating posterior portals and dissection layers in the upper back and arm. Anatomical accuracy verified by SciePro's Medical Advisory Board.