Muscle Actions Part One (D)

pectoralis major

flexor carpi radialis and ulnaris

deltoid

sternocleidomastoid

rectus abdominis

biceps brachii

trapezius

triceps brachii

latissimus dorsi

levator scapulae

extends elbow

elbow flexion, forearm supination.

flexes waist and compresses abdominal viscera

adducts and medially rotates humerus, extends the shoulder joint

rotates head left and right. bilaterally draws head forward and down.

ant. fibers flex and medially rotate arm, lat. fibers abduct the arm, post. fibers extend and laterally rotate the arm

flexes, adducts, and medially rotates humerus

flexes wrist anteriorly

extends and laterally flexes the neck.

elevates scapula if cervical vertebrae are fixed., flexes neck laterally when scapula is fixed.