Origin: lateral epicondyle of humerus

insertion: lateral olecranon process

Action: abducts ulna during pronation

origin: posterior surface of radius and ulna

insertion: metecarpal 1 and trapezium

Action: abducts/extends thumb

origin: doesal shaft of radius

Insertion: proximal phanlynx of thumb

Action: extends thumb

Origin:dorsal shaft of ulna

Insertion: base of distal phalanx of thumb

Action: extends thumb

Origin: distal 1/3 of dorsal ulna

Insertion: base of proximal phalanx of #2

Action: extends pointer finger;assists pronation

Origin: lateral supercondylar ridge of humerus

insertion: base of metecarpal #2

Action: extends/abducts wrist

extensor carpi ulnaris

Origin: lateral epicondyle; posterior border of the ulna

insertion: base of metacarpal #5

Action: extends/adducts wrist

Origin: lateral epicondyle

Insertion: distal phalanges off fingers 2-5

Action: extends fingers and wrist

Origin: illiac fossa and crest; lateral sancrum

insertion: lesser trochanter of femur

Action: flex thigh

origin: illiac crest

insertion: transverse proccess of upper lumbar vertabrae and lower margin of 12th rib

Action: flexes spine laterally; maintains posture

Origin: t12 and lumbar vertabrae

insertion: lesser trochanter of femur

Action: lateral flexion of spine

Origin: T12 and L1

insertion: Pubis

Action: flexes lumbar spine

origin: inguinal ligament iliac crest cartilages of last 5 or 6 ribs

insertion: linea alba and pubic crest

Action: compresses abdominal contents

internal oblique

origin: illiac crest, inguinal ligament

insertion: linea alba, pubic crest, costal cartilages of last 3 ribs

action: flexes vertebral column (oblique curls)

Origin: pubic crest and symphyisis

insertion: xiphoid process and costal cartilages of ribs 5-7

action: flexes/ rotates vertabral column (sit ups)

origin: anterior surface of the last 8 ribs

insertion: lina alba, pubic crest, iliac crest

Action: flexes/rotates vertabral column (oblique curls)