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trapezius

muscle that allows you to shrug your shoulders or extend your head

latissimus dorsi

muscle that adducts the shoulder and causes extension of the shoulder joint

deltoid

shoulder muscle that is the antagonist of the latissimus dorsi

erector spinae

prime mover of back extension; a deep composite muscle consisting of three columns

latissimus dorsi

large paired superficial muscle of the lower back

quadratus lumborum

fleshy muscle forming part of the posterior abdominal wall that helps maintain upright posture

iliopsoas

hip flexor, deep in pelvis; a composite of two muscles

gluteus maximus

used to extend the hip when climbing stairs

gastrocnemius

"toe dancer's" muscle; a two-bellied muscle of the calf

tibialis anterior

inverts and dorsiflexes the foot

adductors

muscle group that allows you to draw your leg to the midline of the body, as when standing at attention

quadriceps

muscle group that extends the knee

hamstrings

muscle group that extends the thigh and flexes the knee

gluteus medius

smaller hip muscle commonly used as an injection site

fibularis muscles

muscle group of the lateral leg; plantar flexes and everts the foot

sartorius

straplike muscle that is a weak thigh flexor; the "tailor's muscle"

soleus

like the two-bellied muscle that lies over it, this muscle is a plantar flexor

flexor carpi ulnaris

wrist flexor that follows the ulna

extensor digitorum

muscle that extends the fingers

flexor digitorum superficialis

muscle that flexes the fingers

biceps brachii

muscle that allows you to bend (flex) the elbow

deltoid

powerful shoulder abductor, used to raise the arm overhead

triceps brachii

muscle that extends the elbow

zygomaticus

used in smiling

buccinator

used to suck in your cheeks

orbicularis oculi

used in winking

frontalis

used to form the horizontal frown crease on the forehead

orbicularis oris

the "kissing" muscle

masseter

prime mover of jaw closure

temporalis

synergist muscle for jaw closure

sternocleidomastoid

prime mover of head flexion; a two-headed muscle

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