HAPS - Muscle Movements

buccinator

sucks in (compresses) the cheeks

frontalis

elevates the eyebrows

glossus

helps move food around in mouth during chewing and forming sounds

temporalis

elevates and retracts the mandible

masseter

only elevates the mandible

mentalis

protrudes lower lip and wrinkles chin

orbicularis oculi

squinting, blinking, winking of the eye

orbicularis oris

puckers lips (fish lips, kissing)

zygomaticus

pulls corners of mouth into smile

sternocleidomastoid

together: flexes neck; individually: rotates head

platysma

pulls corners of mouth into a frown

sternohyoid

depresses hyoid bone & flexes head at the neck

pectoralis group

flexes, rotates, and adducts arm at shoulder joint

latissimus dorsi

extends, adducts, and medially rotates arms at shoulder joint

intercostals

elevates and depresses rib cage during inhalation and exhalation

trapezius

elevates, retracts, and depresses scapula (shoulders) and extends the head

transverse abdominis

compresses internal organs

diaphragm

contracts for inhalation only

rectus abdominis

flexes the waist

obliques

rotates and laterally flexes waist

erector spinae group

extends vertebral column, keeps spine erect

opponens pollicis

thumb touches tip of little finger

extensor hallucis longus

extends big toe

flexor digitorum longus

flexes toes

flexor hallucis longus

flexes big toe

gastrocnemius

plantar flexes foot & flexes knee

soleus

only plantar flexes foot

tibialis anterior

dorsiflexes and inverts foot

quadriceps group

extends knee and flexes femur at hip joint

hamstrings

flexes knee and flexes femur at hip joint

adductor group

adducts femur at hip joint

popliteus

flexes and rotates to unlock the knee joint

extensor carpi (muscles)

extends wrists

extensor digitorum group

extends fingers

extensor pollicis longus

extends thumb

flexor carpi

flexes wrist

flexor digitorum group

flexes fingers

flexor pollicis longus

flexes thumb

pronator teres

moves palms down and back

supinator

moves palms forward and up

deltoid

abduction of arm and shoulder

biceps brachii

flexes elbow

triceps brachii

extends arm at the elbow

abductor hallucis

abducts big toe

extensor digitorum longus

extends toes