Superficial Lymphatics of the Forearm Without the Muscles, Posterior View

Description

Posterior forearm lymphatic vessels course superficially in the subcutaneous tissue over the extensor compartment, ascending from the dorsum of the hand toward the lateral epicondyle and medial epicondyle regions. With the muscles removed, the radius lies lateral and the ulna medial, providing fixed bony landmarks as lymphatics track proximally alongside the superficial venous network, most often paralleling the cephalic vein laterally and the basilic vein medially. Proximally, these collectors converge toward the cubital fossa region and continue to the epitrochlear (supratrochlear) nodes medially and onward to the axillary nodes. Posterior mapping matters because superficial lymphatic drainage of the upper limb is commonly assessed indirectly by following the superficial veins and palpable nodes along the medial arm. Sentinel lymph node concepts extend beyond breast and melanoma, and infections of the dorsum of the hand or posterior forearm can produce lymphangitis with tender, erythematous streaking that tracks proximally toward epitrochlear lymphadenopathy. This is a practical surface anatomy pathway. It also supports planning incision placement and flap elevation, where preserving superficial lymphatics can reduce postoperative lymphedema risk. Faculty can drop this figure into upper-limb anatomy lab manuals to clarify why dorsoradial drainage tends to follow the cephalic route, while ulnar-sided collectors more often reach epitrochlear nodes before the axilla. It also fits clinical teaching on cellulitis workup, node palpation points, and post-axillary dissection counseling in surgical oncology and physiotherapy resources. Anatomical accuracy verified by SciePro's Medical Advisory Board.