Kinesiology 2241A/B Lecture Notes - Lecture 11: Soleus Muscle, Clavicle, Breaststroke

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2241A/B
• Professor: Bob Vigars

Document Summary

Upper extremities parts shoulder girdle shoulder joint elbow joint radioulnar joint: wrist joint. Muscle contribution to joint stronger muscles = more joint stability angles of pull influence joint stability stabilizing angles = < 90 dislocating angles = > 90 . Shoulder girdle involved in reaching/grasping motions designed for mobility unstable joint strength of muscles very important. Shoulder joint involved in a wide variety of motions designed for mobility, unstable joint rotator cuffs & deltoids = small angle pull: wheel-axle mechanism (axle is humerus, wheel is hand and forearm) Cocking action" =extreme lateral rotation rapid medial rotation and protraction strengthen medial rotators both concentrically and eccentrically: extra lateral rotation of the shoulder. Elbow joint only flexion and extension stable joint due to bony structure: muscle arrangement = stabilizing effect. How to strengthen elbow extensors elbow extensions with shoulder flexed (e) shoulder hyperextensions with elbow extended (d)