Medial Cord of the Brachial Plexus, Anterior View

Description

Arising from the anterior division of the inferior trunk (C8 to T1), the medial cord (fasciculus medialis) is shown in anterior view within the axilla, positioned medial to the axillary artery and deep to the pectoralis major and pectoralis minor. Proximally it lies inferior to the clavicle and anterior to the first rib, then tracks distally toward the humerus, where its terminal branches diverge into the medial cutaneous nerve of arm, medial cutaneous nerve of forearm, ulnar nerve, and the medial root of the median nerve. Portions of the deltoid and pectoral musculature frame the neurovascular bundle, with the scapula and clavicle providing bony landmarks for orientation. Relationships matter here. Clear separation of cords by their relationship to the axillary artery is what makes this projection clinically readable, since many traction and compression neuropathies are localized by asking which cord-level functions are lost before the nerves fully declare themselves in the arm. Medial cord involvement is a common concern in lower brachial plexus lesions, including Klumpke-type patterns, and it also sits in the corridor traversed during axillary lymph node dissection and breast surgery where iatrogenic injury can affect ulnar-distribution sensation and intrinsic hand strength. An anterior axillary view also matches the surgical field for infraclavicular approaches, where pectoralis minor can hide the cords and confuse identification without a solid mental map. Ideal for upper limb anatomy labs, neuroanatomy teaching files, and surgical education materials covering brachial plexus blocks (infraclavicular) and axillary exploration, this artwork also supports figure sets in clinical texts discussing lower plexus palsy and medial arm or forearm sensory loss patterns. Use it to anchor cord-level organization before branching into terminal nerves and dermatomes. Anatomical accuracy verified by SciePro's Medical Advisory Board.