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20 terms

AP1 Trunk, Arm, Forearm Muscle Actions

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Pectoralis major
adducts and flexes the arm
Pectoralis minor
abducts scapula and rotates it downward, elevates 3rd - 5th ribs during forced inhalation
Serratus anterior
abducts and rotates scapula upward - boxers stance
Latissimus dorsi
extends and adducts arm at shoulder joint, lowers arm when when it is ekevated overhead
Trapezius
middle portion adducts scapula, inferior portion depresses scapula
External oblique
Bilateral contraction that compresses abdomen and flexes vertebral column
Rectus abdominus
Flexes vertebral column,especially lumbar region
Internal oblique
bilateral contraction that compresses abdomen and flexes vertebral column
Transversus abdominus
compresses abdomen
Diaphragm
flattens to increase the length and volume of thoracic cavity during normal inspiration
Infraspinatus
laterally rotates and adducts arm at shoulder joint
Supraspinatus
assists deltoid muscle in abducting arm at shoulder joint
Teres major
extends arm at shoulder joint
Teres minor
laterally rotates, extends and adducts arm at shoulder joint
Subscapularis
medially rotates arm at shoulder
Deltoid
lateral portion abducts arm, anterior portion flexes arm, posterior portion extends arm
Biceps brachii
flexes forearm at at elbow and flexes arm at shoulder
Brachialis
flexes forearm at elbow
Triceps brachii
extends forearm at elbow, extends arm at shoulder
Brachioradialis
flexes forearm, pronates and supinates forearm