Biol129_c15 - The Brachial Plexus Brachial Plexus Mixing of...

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1 The Brachial Plexus Brachial Plexus • Mixing of ventral rami from C5-T1 • Five (5) major nerves of arm and shoulder – Two posterior and three anterior – All nerves are mixed: S and M • A couple of minor important nerves: – Suprascapular n splits before Axillary n – Long Thoracic n begins higher, takes contributions from C6 & 7
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2 Posterior Nerves • Axillary n – S: Skin of shoulder & arm, joint; M: Deltoid & Teres Minor • Radial n – S: Skin post arm, forearm & wrist, joints; M: Anterior Nerves • Musculocutaneous n (mainly C5) – S: Skin of lat forearm; M: Brach, Biceps, Coracobrach •M ed i an n – S: Skin lat 2/3 hand, hand joints; M: flexors in
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3 Location • Dermatomes show innervation patterns from the spinal level. • Note that peripheral nerves differ. • E.g. the median n serves the lateral hand, while the ulnar n serves the medial hand. Dermatomes
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4 • Thorax is an anatomic subdivision – Defined by thoracic cavity, contents, inferior to neck, superior to abdomen • Chest is a region • Thorax contains major parts of three systems: – Pulmonary, Cardiovascular and Immune Skeletal Structure • Refinements: • There are 4 atypical ribs: – The latter are “floating” ribs
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This note was uploaded on 03/31/2008 for the course BIOL 129 taught by Professor Sachshowardgeor during the Spring '08 term at Pennsylvania State University, University Park.

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Biol129_c15 - The Brachial Plexus Brachial Plexus Mixing of...

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