Ulnar Nerve

Description

Running from the medial cord of the brachial plexus, the ulnar nerve tracks inferiorly along the medial aspect of the upper arm, closely related to the axillary and proximal brachial region before approaching the elbow. Proximally it lies anterior and medial to the humerus, then courses toward the posteromedial elbow where it passes posterior to the medial epicondyle on its way into the forearm. Portions of the shoulder girdle and thoracic cage (scapula, ribs), the humerus, and the paired forearm bones (ulna and radius) provide clear osseous landmarks, while superficial venous channels are drawn in parallel to emphasize neurovascular proximity. Fascicular organization and the neurilemma are implied by the crisp nerve rendering rather than microanatomic cross sections. This perspective matters because the ulnar nerve’s transition around the medial epicondyle defines a common entrapment site and a palpation landmark. Cubital tunnel syndrome often localizes here, and the illustration helps correlate sensory symptoms in the ulnar digits with proximal compression, traction during elbow flexion, or subluxation of the nerve over the epicondyle. It also supports procedural planning: medial elbow approaches, ulnar nerve decompression, and anterior transposition all hinge on understanding the nerve’s relationship to the medial epicondyle, Osborne’s fascia, and adjacent venous structures at the elbow crease. Small space. Big consequences. Use this artwork in gross anatomy and neuroanatomy teaching when introducing the brachial plexus terminal branches, and in hand surgery or sports medicine materials covering ulnar neuropathy in throwers and cyclists. It also fits clinical education pieces that pair surface anatomy with nerve course, such as exam preparation for Tinel sign at the cubital tunnel or counseling after medial epicondyle trauma. Anatomical accuracy verified by SciePro's Medical Advisory Board.