A&P Muscle Lab

epicranius

epicranius

wrinkles the forehead

orbicularis oculi

circular muscle that closes and opens the eyes

orbicularis oris

circular muscle that opens and closes the mouth

temporalis

lifts and retracts the mandible

masseter

responsible for chewing

mentalis

muscle that protrudes the lower lip and wrinkles the chin

sternohyoid

muscle that depresses the hyloid bone during speech and swallowing

sternocleidomastoid

head rotation and flexion of the neck

platysma

muscle that depresses the corners of the mouth and lower the mandible

deltoid

muscle found on the shoulder responsible for flexion, abduction and extension of the arm

trapezius

responsible for depressing, elevating, rotating, and retracting the scapula

Levator scapulae

elevates scapula

Supraspinatus

abduction of the arm

Rotator cuff (SITS)

supraspinatus, infraspinatus, teres minior, subscapularis

infraspinatus

lateral rotation of the arm

teres minor

lateral rotation of the arm

subscapularis

medial rotation of the arm

Pectoralis minor

stabilization, depression, abduction, medial rotation of the scapula

Pectoralis major

flexion, adduction and medial rotation of the humerus

intercostals

external intercostal: elevates ribs, internal intercostal: depresses ribs

diaphragm

inspiration

serratus anterior

protraction of the scapula

external oblique

flexion of the vertebral column

internal oblique

flexion of vertebral column

rectus abdominis

flexion of vertebral column

transverse abdominis

compression of abdominal contents

linea alba

white fibrous tissue that runs down the middle of the rectus abdominis

triceps brachii

extension of the forearm

biceps brachii

flexion of the forearm, supination

brachialis

flexion of the forearm

extensor carpi radialis longus

extension of the wrist

extensor carpi radialis brevis

extension of the wrist

flexor carpi ulnaris

flexion of the wrist

extensor digitorium

extension of the digits

flexor carpi radialis

flexion of the wrist

brachioradialis

flexion of the forearm

Extensor carpis ulnaris

extension of the wrist

iliopsoas

flexion of the leg at the hip

gluteus maximus

extension at the hip, lateral rotation

gluteus minimus

abduction at the hip

gluteus medius

abduction at the hip

piriformis

lateral rotation

Rectus femoris

flexion at the hip, extension at the kneee

Vastus lateralis

extension at the knee

Vastus medialis

extension at the knee

Vastus intermedialis

extension at the knee

Tensor fasciae latae

extension and lateral rotation

Sartorius

flexion at the hip, abduction and lateral rotation

Gracilis

adduction at the hip, flexion at the knee

biceps femoris

extension at the hip, flexion at the knee

semitendinosus

extension at hip, flexion at knee

semimembranosus

extension at hip, flexion at knee

gastrocnemius

plantar flexion

soleus

plantar flexion

extensor digitorium longus

extends the digits, dorsiflexion, and inversion

tibialis anterior

dorsiflexion and inversion

fibularis longus

eversion of ankle

latissmus dorsi

extension, adduction, and medial rotation of the arm

rhomboids

retraction and rotation of the scapula

erector spinae

extension and lateral flexion of the vertebral column

flexion

decreasing the angle between two bones

extension

increasing the angle between two bones

adduction

moving towards the midline

abduction

moving away from the midline

elevation

upward movement

depression

downward movement