HCCC A&P I Lab Test II
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Function: Closes Eyes
Muscle: Orbicularis oculi
Function: Raises lateral corners of mouth upward
Muscle: Zygomaticus major and minor
Function: Closes lips
Muscle: Orbicularis oris
Function: Prime mover of jaw closure (chewing)
Function: Depreses mandible & pulls lower lip back and down.
Muscle: Platysma (greek for plate)
Function: flexion of neck forward and rotate head toward shoulder on opposite side.
Function: Prime mover of arm flexion; adducts medially rotates arm.
Muscle: Pectoralis major
Function: Acting as a whole, prime mover of arm abduction
Function: with ribs fixed, draws scapula forward and inferiorly.
Muscle: Pectoralis minor
Function: pulls ribs toward one another to elevate rib cage.
Muscle: Exteral intercostals
Function: Dra ribs together to depress rib cage.
Muscle: Internal intercostals
Function: Prime mover of inspiration flattens on contraction.
Function: Flexes and rotates vertebral column
Muscle: Rectus abdominis
Function: truck rotation and lateral flexion.
Muscle: External oblique
Function: raises, rotates, and retracts (adducts) scapula and stabilies it.
Function: Prime mover of arm extension; adducts and medially rotates arm.
Function: Powerful forearm extensor
Muscle: Triceps brachil
Function: Flexion (powerful) of elbow and supination of forearm
Muscle: Biceps bracii
Function: flexes distal phalanges
Muscle: Flexor digitorum profundus
Function: Prime mover of finger extension.
Function: Flexes, abducts, and laterally rotates thigh; flexes knee.
Function: Extends knee and flexes thigh at hip.
Muscle: Quadriceps femoris
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