Quick Facts
Origin: Medial cord of the brachial plexus.
Course: It runs inferiorly along the medial wall of the arm.
Branches: Anterior and posterior branches.
Supply: Sensory innervation. Supplies skin on the anterior surface of the arm, medial surface of the forearm.
Origin
The medial antebrachial cutaneous nerve arises from the medial cord of the brachial plexus. It contains fibers from spinal cord segments C8 and T1.
Course
The medial antebrachial cutaneous nerve emerges from the medial cord medial to the second portion of the axillary artery. Typically, its origin is distal to the origin of both the medial pectoral nerve and the medial brachial cutaneous nerve.
The nerve descends in the arm, initially between the axillary artery and vein. At this point it gives off an unnamed ramus that travels subcutaneously to supply the skin over the biceps brachii. The medial antebrachial cutaneous nerve then passes medial to the brachial artery, accompanying the basilic vein. It divides midway in the arm into anterior and posterior branches which continue into the forearm.
Branches
The medial antebrachial cutaneous nerve divides into anterior and posterior branches.
Supplied Structures
The medial antebrachial cutaneous nerve is a sensory nerve. It supplies skin over the anterior surface of the lower half of the arm, the cubital fossa, and anteromedial surface of the arm.
