muscle 1: motions

origin

immovable point of attachment

insertion

attachment on bone that’s movable during action

ex: when biceps brachii contract, forearm moves towards humerus

agonist

muscle group that’s primarily responsible for producing movement

antagonist

muscle group located on opposite side of joint and reverses movement of agonist

synergist

aids an agonist in performing a movement

flexion

decreasing angle that the body makes

extension

increasing angle that the body makes

elevate shoulders

raise shoulders towards ears

depress shoulders

lower shoulders to normal position

protraction of shoulders

“hunching over” so that shoulders are close to each other

retraction of shoulder

squeezing shoulderblades together

lateral rotation

rotating limb laterally

medial rotation

rotating limbs medially

abduction

lifting limbs away from midline

adduction

lowering limbs towards midline

supination

radius & ulna parallel

pronation

radius goes over ulna

opposition

thumb touches pinky

inversion

soles of feet pointing medially

eversion

soles of feet pointing laterally

dorsiflexion

flexing feet

plantar flexion

pointing toes