prime mover of jaw closure, elevates mandible.
closes lips, purses and protrudes lips (ie kissing or whistling)
extends head. raises, rotates, and retracts (adducts) scapula and stabilizes it.
acting as a whole, prime mover of arm abduction.
powerful forearm extensor
flexion of elbow and supination of forearm
major forearm flexor
synergist in forearm extension
prime mover of arm flexion; adducts, medially rotates arm
external: pull ribs toward one another to elevate rib cage (inspiration)
internal: draw ribs together to depress rib cage (expiration)
flexes and rotates vertebral column
external: largest and most superficial of the 3 lateral muscles. flexes & rotates vertebral column, compresses abdominal wall.
internal: same functions as external
flexes, abducts, and laterally rotates thigh; flexes knee
extends thigh, flexes knee
(calf muscle) plantar flexes foot
(deep to gastrocnemius) plantar flexion, is an important muscle for locomotion
prime mover of dorsiflexion
prime mover of arm extension; adducts and medially rotates arm
powerful thigh extensor, laterally rotates and abduct thigh
abducts and medially rotates thigh; steadies pelvis
extend and bend the vertebral column laterally
prime mover of inspiration flattens on contraction
extends knee and flexes thigh at hip. steadies knee
flexion of neck forward, rotate head toward shoulder on opposite side