Muscle Set #2

Pectoralis major

Pectoralis major

adducts and flexes humerus

Pectoralis minor

draws scapula down, rotates shoulder upward

Rectus abdominis

flexes vertebral column (used during defecation, childbirth, and breathing, 6 pack)

External oblique

flexes and rotates vertebral column

Internal oblique

flexes and rotates vertebral column

Transverse abdominis

compresses abdominal contents

External intercostals

elevate ribs when inhaling

Internal intercostals

depress ribs when exhaling

Diaphragm

breathing

Serratus anterior

moves scapula forward and rotates it upward

Latissimus dorsi

(back) extends and adducts humerus

Gluteus medius

abducts thigh and medially rotates thigh (injection site)

Gluteus minimus

abducts thigh

Gluteus maximus

(butt) extends hip (climbing stairs)

Erector spinae

(3 parts), extend the vertebral column

Trapezius

extends neck, adducts and stabilizes scapula

Levator scapula

raises scapula

Rhomboideus major

pulls scapula medially

Deltoid

abducts humerus

Supraspinatus

helps deltoid abduct upper arm

Biceps brachii

flexes elbow and supinates forearm (turn and pull bottle top)

Brachioradialis

forearm flexion (flexes elbow)

Brachialis

elbow flexion

Pronator teres

assists in pronation

Palmaris longis

weakly flexes wrist (sometimes absent)

Triceps brachii

extends elbow (punching)

Extensor carpi radialis longus

extends and abducts wrist

Extensor carpi radialis brevus

extends and abducts wrist

Extensor digitorum

extends fingers and wrist, adducts fingers

Extensor carpi ulnaris

extends and adducts wrist

Flexor carpi ulnaris

flexes wrist

Infraspinatus

rotates arm laterally

Supinator

supinates forearm and hand

Flexor carpi radialis

flexes wrist