Posterior division
posterior parietal cortex – primary zone for integration of visual and somatosensory inputs, responds to eye movement location
The posterior division, also known as posterior cord, is a part of the brachial plexus, which is a network of nerves that innervate the upper limb. It arises from the fusion of the posterior divisions of the fifth, sixth, and seventh cervical spinal nerves, and the first thoracic spinal nerve.
The posterior division gives rise to three major nerves: the axillary nerve, the radial nerve, and the subscapular nerves.
The axillary nerve innervates the deltoid muscle and the teres minor muscle, and also provides sensory innervation to the skin of the shoulder.
The radial nerve innervates the extensor muscles of the arm, forearm, and hand, including the triceps brachii, brachioradialis, and anconeus muscles. It also provides sensory innervation to the skin of the dorsal aspect of the arm, forearm, and hand.
The subscapular nerves innervate the subscapularis muscle and the teres major muscle.
Damage to the posterior division can result in weakness or paralysis of the deltoid, teres minor, triceps brachii, and extensor muscles of the arm, forearm, and hand. It can also lead to sensory deficits in the skin of the shoulder, arm, forearm, and hand.
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