A&P skeletal muscles

Biceps

flexes elbow joint

Deltoid

prime mover of arm abduction

Diaphragm

prime mover of inspiration

Epicranius

frontalis and occipitalis; raises eyebrows, wrinkles forehead horizontally

Erector spinae

prime mover of back extension

Extensor digitorum

prime mover of finger extension

Extensor indicis

extends index finger

extensor carpi radialis/ulnaris

wrist extensor

flexor carpi radialis/ulnarius

wrist flexor

flexor digitorum longus

plantar flexion and foot inversion

gastrocnemius/soleus

plantar flexion during knee extension

gluteus maximus

hip extension

gluteus medius/ tensor fasciae latae

abducts and medially rotates thigh

gracilis/pectineus/adductors

thigh adduction

hamstrings

biceps femoris, semitendinosus, semimembranosus; prime movers of thigh extension and knee flexion

iliopsoas

prime mover for thigh flexion

latissimus dorsi

prime mover of arm extension

masseter

prime mover of jaw closure

orbicularis oris

kissing/whistling muscle

pectoralis major

prime mover of arm flexion

peroneus longus/brevis

plantar flexion and foot eversion

pharyngeal constrictors

constrict pharynx during swallowing which propels food à esophagus

popliteus

flexes and rotates leg medially to unlock extended knee

pterygoids

protrudes mandible, provides force for teeth grinding

quadriceps femoris

rectus femoris, vastus lateralis, vastus medialis, vastus intermedius; knee extension

rectus abdominus

flexes/rotates lumbar region of vertebral column

rhomboids

“squares” the shoulders

rotator cuff muscles

supraspinatus, infraspinatus, teres minor, subscapularis; reinforced the capsule of the shoulder joint to prevent dislocation

sartorius

hip and knee flexion

splenius

extends or hyperextends head

sternocleidomastoid

head flexion, neck flexion

teres major

arm adduction

tibialis anterior

prime mover of dorsiflexion

trapezius

stabilizes, raises, retracts and rotates scapula

triceps

prime mover of forearm extension

zygomaticus

smiling muscle