Anteromedial Surface Of The Humerus, Anatomy

Description

Anteromedial humeral shaft anatomy is emphasized from the proximal third down toward the distal metaphysis, where the anterior surface blends medially into the sharp medial border. Proximally, the bicipital (intertubercular) groove lies anterolateral to this field, while the lesser tubercle and surgical neck sit superior to the smoother diaphyseal cortex. Along the midshaft, the anteromedial surface provides broad origin for the brachialis (deep to biceps brachii) and receives insertion of coracobrachialis on the medial aspect, with the medial intermuscular septum anchoring along the medial supracondylar ridge as the bone flares distally. Landmarks matter here. Clinically, the anteromedial cortex is a key reference when describing humeral shaft fracture patterns, because spiral and oblique fractures can be localized relative to the deltoid tuberosity laterally and the nutrient foramen that typically enters the shaft on the anteromedial surface in the middle third. That relationship is not academic: the nutrient artery supports endosteal blood supply, and comminution near the foramen can influence healing and fixation strategy. The illustration’s fixed perspective is also useful for teaching the surface anatomy that underlies medial arm approaches, where the brachial artery and median nerve track along the medial aspect of the arm while the coracobrachialis and brachialis define muscular planes over the anterior humerus. Use this illustration in undergraduate gross anatomy labs to orient students to humeral shaft surfaces, in orthopedic teaching files when documenting fracture level and approach planning, and in medical publishing for chapters covering arm compartment anatomy and surgical exposures of the humerus. Anatomical accuracy verified by SciePro's Medical Advisory Board.