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Cervical Plexus - cords cords form 5 major branches...

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spinal cord Cervical Plexus (cont) * Phrenic Nerve ( C3 & C4 & C5 ) - Descends through the neck and thorax to supply the diaphragm. * It lies on the scalenus anterior muscle and enters the thorax between the subclavian artery and the subclavian vein. * The phrenic nerve is the only nerve to the diaphragm Brachial Plexus Emerges From The Posterior Triangle * Posterior triangle--bordered by the posterior border of the SCM, trapezius, and clavicle Brachial Plexus * the brachial plexus and subclavian artery pass between the scalenus anterior (sa) and medius (sm) muscles. The subclavian vein passes anterior to the scalenus anterior muscle. Legend brachial plexus (bp) subclavian artery (sca) subclavian vein (sv) scalenus anterior (sa) medius (sm) muscles levator scapulae (ls) spinal accessory (sa) nerve * roots - fromed by the5 ventral rami (C5-T1) * five roots unite to form the upper, middle, and lower trunks * Each trunk divide into an anterior and posterior division * the six divisions merge to form three large fiber bundles, the posterior, medial, and lateral
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Unformatted text preview: cords * cords form 5 major branches * axillary * radial * musculocutaneous * median * ulner Brachial plexus * origin in the posterior triangle of the neck. * they enter the posterior triangle by emerging from between the interval between scalenus anterior and scalenus medius. * fromed from the ventral rami of C5, C6, C7, C8, and T1 * Along with the subclavian artery, the brachial plexus acquires a sheath, the axillary sheath. Dorsal Scapular Nerve Axillary Nerve: C5, C6 spinal cord * In the axilla on each side, the quadrangular space is bounded by: * superiorly: * and ventrally: subscapularis * and dorsally: teres minor * inferiorly: teres major * medially: long head of triceps * laterally: humerus * It transmits the: * axillary nerve * posterior circumflex humeral artery * posterior circumflex humeral vein * muscles innervated * teres minor * deltoid * origin * posterior division of the trunks of the brachial plexus Radial Nerve Radial Nerve: Cat...
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