ZOO 3713C Lecture Notes - Lecture 1: Extensor Pollicis Brevis Muscle, Flexor Pollicis Longus Muscle, Extensor Pollicis Longus Muscle
Document Summary
Supraspinatus: abductor of the arm, belongs to the rotator cuff muscle group. Infraspinatus: lateral rotator of the arm belongs to the rotator cuff muscle group. Rotator cuff group, nn: axillary (circumflex) n. c5-c6. Pathology: tendinopathy of supraspinatus (baseball), calcification, pain, tendon rupture >40 y and in younger people, avulsion of greater tub. Rotator cuff function: help to maintain the stability of the shoulder joint. Function: most important abductor of the arm up to 90 degree. Part: flexes (anteversion) the arm+ medial rotation of the arm. Origin: lateral border of scapula close to inferior angle. Insertion: crest of lesser tubercle of the humerus. Origin: vertebral part, thoracolumbar part, iliac part and costal part. Function: adduction and medial rotation and extension of the arm, Insertion: from superior to inferior angle and the medial border of the scapula. Protracts the scapula and holds it against the thoracic wall and rotates the scapula laterally to elevate the arm.
