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Erb's palsy is a paralysis of the arm caused by injury to the upper group of the arm's main nerves, specifically the severing of the upper trunk C5–C6 nerves. These form part of the brachial plexus, comprising the ventral rami of spinal nerves C5–C8 and thoracic nerve T1.
The subclavius is a small triangular muscle, placed between the clavicle and the first rib. [1] Along with the pectoralis major and pectoralis minor muscles , the subclavius muscle makes up the anterior axioappendicular muscles , also known as anterior wall of the axilla .
The subclavian nerve, also known as the nerve to the subclavius, is a small branch of the upper trunk of the brachial plexus. It contains axons from C5 and C6 . It innervates the subclavius muscle .
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Injury to Erb's point is commonly sustained at birth or from a fall onto the shoulder.The nerve roots normally involved are C5 and partly C6. Symptoms include paralysis of the biceps, brachialis, and coracobrachialis (through the musculocutaneous nerve); the brachioradialis (through the radial nerve); and the deltoid (through the axillary nerve).
It occupies the interval between the pectoralis minor and subclavius, and protects the axillary vein and artery, and axillary nerve. [ 1 ] Traced upward, it splits to enclose the subclavius, and its two layers are attached to the clavicle , one in front of and the other behind the muscle; the deep layer fuses with the deep cervical fascia and ...