Health Sciences 2300A/B Lecture Notes - Lecture 7: Bicipital Groove, Subscapularis Muscle, Biceps

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 2300A/B
• Professor: Christopher William James Melling

Document Summary

Topic 7 muscles of the upper limbs. Nerve plexuses: brachial plexus is the plexus the innervates the muscles of the pectoral girdle and upper limb. 2 groups: muscles that move the pectoral or shoulder girdle, anterior and posterior, muscles that move the humerus or arm, axial - anterior and posterior, scapular - anterior and posterior. Superior fibres cause an upwards rotation of scapula, reaching up. Inferior fibres cause a downwards rotation of scapula, lower the scapula: middle fibres adduct the scapula, bring it towards the midline. Innervation - accessory nerve (cn-11: rhomboids, rhomboid major and minor, do the same thing, elevate, adduct and downwardly rotate the scapula. Innervation - dorsal scapular nerve: levator scapulae, elevates and downwardly rotates the scapula. Subclavius: only muscle that influences the clavicle, located under the clavicle, stabilizes the clavicle, first rib to under the clavicle.