KP221 Lecture Notes - Lecture 6: Deltoid Tuberosity, Latissimus Dorsi Muscle, Serratus Anterior Muscle

• School: WLU
• Department: Kinesiology & Physical Education
• Course: KP221
• Professor: Michael Cinelli

Document Summary

Muscle of shoulder proper (give shoulder its shape) Kp221 lecture topic 6: fibers run in different directions different actions (ant. , post. , lat. , origin = (anterior) lateral 1/3 of clavicle; (posterior) spine of scapula; (lateral) acromion, posterior = shares insertion point with trapezius. Insertion = 3 heads converge into deltoid tuberosity (rough; where deltoid attaches, most lateral side: muscle fibers have optimal length in which they like to contract. Innervation = axillary: action = (ant. ) medial rotation and flexion of humerus; (post. ) lateral rotation and extend humerus; (lat. ) abduct arm (from 15-90o) & pectoralis major: **trapezius is involved in most of these movements.