Middle finger hand drawing2/14/2024 Muscles affected – supraspinatus, infraspinatus, subclavius, biceps brachii, brachialis, coracobrachialis, deltoid and teres minor.This includes the musculocutaneous, axillary, suprascapular, and nerve to subclavius. Nerves affected – the peripheral nerves derived from C5-6 roots are most affected.It most commonly occurs as a result of a stretching injury during a difficult vaginal delivery. There are no functional differences between these divisions – they are simply used to aid explanation of the brachial plexus.Ĭlinical Relevance: Upper Brachial Plexus Injury (Erb’s Palsy)Įrb’s palsy refers to an injury to the upper roots of the brachial plexus (typically C5-6). The brachial plexus is divided into five parts roots, trunks, divisions, cords and branches (a good mnemonic for this is Read That Damn Cadaver Book). In this article, we shall look at the anatomy of the brachial plexus – its formation and anatomical course through the body. The plexus is formed by the anterior rami (divisions) of cervical spinal nerves C5, C6, C7 and C8, and the first thoracic spinal nerve, T1. It begins in the root of the neck, passes through the axilla, and runs through the entire upper extremity. The brachial plexus is a network of nerve fibres that supplies the skin and musculature of the upper limb. 8 Clinical Relevance: Lower Brachial Plexus Injury (Klumpke’s Palsy).7 Clinical Relevance: Upper Brachial Plexus Injury (Erb’s Palsy).5.6 Practical Relevance: Dissecting the Brachial Plexus.
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