Lab 11: Posterior muscles (upper body)

Splenium capitis origin

nuchal ligament

splenium capitis insertion

mastoid process

splenium capitis action

extend head bilaterally

trapezius origin

occipital bone

trapezius insertion

lateral clavicle

trapezius action

elevate scapula

latissimus dorsi origin

iliac crest

latissimus dorsi insertion

floor of intertubercular sulcus

latissimus dorsi action

extend arm

rhomboid major origin

T2-T5 spinous process

rhomboid major insertion

medial border of scapula below spine

rhomboid major action

retract scapula

rhomboid minor origin

nuchal ligament

rhomboid minor insertion

medial scapular border at root of spine

rhomboid minor action

retract scapula

supraspinatus origin

supraspinous fossa

supraspinatus insertion

greater tubercle of humerus

supraspinatus action

stabilize shoulder

infraspinatus origin

infraspinous fossa

infraspinatus insertion

greater tubercle of humerus

infraspinatus action

stabilize shoulder

teres minor origin

lateral border of scapula

teres minor insertion

greater tubercle of humerus

teres minor action

stabilize shoulder

triceps brachii origin

posterior humerus

triceps brachii insertion

olecranon of ulna

triceps brachii action

extend elbow

abductor pollicis longus origin

interosseous membrane

abductor pollicis longus insertion

base of first metacarpal

abductor pollicis longus action

extend thumb at CMC joint

extensor digitorum origin

lateral epicondyle of humerus

extensor digitorum insertion

extensor expansions of digits 2-5

extensor digitorum action

extend wrist

extensor carpi ulnaris origin

lateral epicondyle

extensor carpi ulnaris insertion

base of fifth metacarpal

extensor carpi ulnaris action

extend wrist

extensor retinaculum (not muscle) origin

lateral distal radius

extensor retinaculum (not muscle) insertion

medial carpal region

extensor retinaculum (not muscle) action

holds extensor tendons at dorsal wrist