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Muscular System - Pectoral girdle.docx

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Department
Health Sciences
Course
Health Sciences 2300A/B
Professor
Jamie Melling
Semester
Fall

Description
Muscular System ­ The Pectoral Girdle’ ­ Scapula isn’t stagnate ­ allows are to move in space.  ­ Brachial Plexuses innervate the entire inner limb. ­ 5 roots that come right out of the spinal cord. Come out from between vertebral  bodies.  ­ From 5 roots to 3 trunks(Superior, middle, inferior), to 6 divisions (3 anterior, 3  posterior).  ­ Clinically important ­ any injury to shoulder, neck and arm can be assessed with  this nerve and its roots.  Trapezius ­ lots of fibres.  ­ Not just one action.  ­ 3 separate fibre groups ­ at least 3 different actions can be performed.  ­ Elevate, adduct and depress.  ­ The accessory nerve is innervating this muscle. Rhomboids ­ Major muscle & minor muscle ­ Come off medial border of scapular; the minor comes right off the spine of the  scapula and the major is right below it ­ Responsible for retraction of scapula ­ Dorsal scapular nerve innervates both. Same function. Adduct & help to elevate  the scapula.  Levator scapulae ­ Dorsal scapular nerve ­ Elevates scapular.  Subclavius ­ Subclaviar nerve.  ­ Depresses clavicle Pectoralis Minor ­ Comes off ribs 3,4,5 and inserts on corocoid process. ­ Pec minor does not move the humerus.  Serratus anterior ­ innervated by long thoracic nerve ­ attaches to top 8 ribs, inserts on medial anterior border of the scapula.  ­ Protracts shoulder blades Cocacobrachialis ­ acts on humerus.  ­ Orig
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