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Laboratory 5. Axillary Region
Step 4. Medial Cutaneous Nerves of the Arm and Forearm

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Adjacent and proximal to the ulnar nerve, identify two nerves arising from the medial cord. These are the medial cutaneous nerve of the arm, which is also called the medial brachial cutaneous nerve, and the medial cutaneous nerve of the forearm, which is also called the medial antebrachial cutaneous nerve. They may arise separately or from a common trunk. These nerves provide cutaneous innervation to the medial aspect of the arm and forearm.

The intercostobrachial nerve arises from the second or third intercostal nerves of the medial wall of the axilla to join the medial brachial cutaneous nerve. It conveys sensation from the skin of the medial aspect of the arm.

Links and References:
Grant's 6.6, 6.22 -6.27;
Netter (1ed.): 402-405; (2ed.): 398-401;
Rohen/Yokochi 374-377, 384-391