Kinesiology 2222A/B Lecture Notes - Lecture 3: Rhomboid Muscles, Trapezius Muscle, Deltoid Tuberosity
20 Apr 2016
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Document Summary
Muscles of the pectoral girdle and upper limbs- appendicular muscles. Nerve plexuses- spinal nerves that come together to form webs (ex. sciatic nerve- comes off a plexus) to innervate muscles. Several plexuses cervical (phrenic nerve c3-c5), brachial, lumber (femoral nerve), sciatic (sciatic nerve) Muscles of the pectoral girdle: muscles that move the shoulder (moves the scapula, clavicle, muscles that move the humerus, anterior, posterior, axialo anterior. Trapezius: moves the scapula, therefore moving entire upper limb. Can rotate, abduct, adduct, elevate, depress: large muscle, many different movements can occur, o: off the ligamentum nuchae o. Have different directions, how they have different functions. Superior runs from cervical region/base of skull down to spine of scapula. Contraction pulls scapula towards origin adduction of scapula. Inferior- opposite direction to superior, lower attachment on spine of scapula. Contraction causes depression of scapula, upwards rotation. Superior angle doesn"t move, inferior angle rotates, glenoid fossa rotates upwards.
