KIN 361 Lecture 12: KIN 361 - Lecture 12
Document Summary
Biceps brachii (long head) two headed muscle, both heads arise on the scapula and join to form a single muscle belly. Rotator cuff (supraspinatus, infraspinatus, subscapularis, teres minor, teres major, deltoid) Trapezoid ligament holds clavicle down to its normal position. Stops clavicle moving to the right or acromion to move backwards towards left (works on a horizontal plane) resists horizontal excursion of the distal clavicle form the acromion. Shoulder scapulo-humeral rhythm abduct arm greater tubercile is going to bump to corcogon or corcon ligament have to externally rotate humerous then put greater tubercle behind and can put arm up 180 degrees. 2 to 1: 2 glenohumeral (gh) motion (120) there is 1 degree of scapula rotation (60) Scapula is moving up and clavicle has to modify to help scapula move up. Can"t (cid:271)en(cid:272)h press (cid:271)e(cid:272)ause ac joint moves too much (for incline bench press only) Scapulo-humeral rhythm - is the kinematic interaction between the scapula and the humerus.
