![]() In humans, the nerves of the plexus usually originate from the lower cervical and the first thoracic spinal cord segments (c5-c8 and T1), but variations are not uncommon. The brachial plexus extends from the neck into the axilla. ![]() Posterior wall: subscapularis, latissimus dorsi, teres major musclesĮmbedded in the axillary fat, enclosed within the axillary sheath, the contents of the axilla include: the axillary artery and its branches, the axillary vein and its tributaries, the branches of the brachial plexus Brachial Plexus The large network of nerve fibers which distributes the innervation of the upper extremity.Lateral wall: intertubercular sulcus Intertubercular sulcus Arm: Anatomy of the humerus Humerus Bone in humans and primates extending from the shoulder joint to the elbow joint. ![]() ![]()
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