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SSCT Intro to A&P C7

SSCT Intro to Anantomy & Physiology Ch. 7

frontalis elevates eyebrows; wrinkles forehead *forehead
orbicularis oris closes mouth, shapes lips *bottom lip
orbicularis oculi closes eye *eyebrow
platysma depresses mandible, grimmace *under chin
masseter elevates mandible *cheeks
temporalis elevates mandible *temples
sternocleidomastoid flexes neck *extends from behind ear to top of chest
rectus abdominus compresses abdomen, flexes trunk *abdominal muscles
external oblique compresses abdomen, rotates trunk *sides of abdomen
serratus anterior protract scapula (pushing away, forward) *shoulder girdle muscle
trapezius moves scapula, various ways *between shoulder & neck
pectoralis major adducts shoulder *chest
latissimus dorsi adducts shoulder *Back (back fat)
deltoid abducts shoulder *shoulder
biceps brachii flexes elbow *upper arm-front
triceps brachii extend elbow *upper arm-back
flexor digitorum flexes wrist & fingers *runs from wrist to elbow along the side of the arm.
extensor digitorum extends wrist & fingers *runs from back of hand to elbow in the middle
rectus femoris extend knee & flexes hip *runs from hip to knee in center
vastus lateralis extend knee *runs from hip to knee on the outside of the thigh
vastus medialis extend knee *runs from hip to knee on the inside of the thigh
vastus intermedius extend knee *
biceps femoris flex knee and extend hip, Hamstring muscle group, back of thigh-to the outside of the thigh, runs butt to knee
semitendinosus flex knee and extend hip, hamstring muscle group *back of thigh-runs butt to knee toward the inside
semimembranosus flex knee and extendd hip, Hamstring muscle group *back of thigh under biceps femoris
gluteus maximus extends hip *butt
tibialis anterior dorsiflexion of ankle *runs from knee to ankle in front of tibia
gastrocnemius plantar flexes ankle *calf muscle
soleus plantar flexes ankle *runs from front of tibia to ankle
Origin attachment of a muscle to the bone that does not move when contraction occurs
Insertion attachment of a muscle to the bone that it moves when contraction occurs
Tendon bands or cords of fibrous connective tissue that attach a muscle to a bone or other structure
Isotonic Contraction of the same tension or pressure
Isometric Contraction type of muscle contraction in which muscle does not shorten
Contraction ability of muscle cells to shorten or contract
Twitch a quick jerky response to a single stimulus
Tetanic Contraction Sustained contraction (tetanus or tetany)
Flexion act of bending decreasing the angle between two bones at the joint
Extension increasing the angle between two bones at a joint
abduction moving a part away from the midline
adduction moving a part toward the midline
rotation movement around a longitudal axis
supination to turn the palm of the hand upward
pronation to turn the palm downward
Dorsiflexion when the top of the foot is elevated with toes pointing upward
plantar flexion action of the bottom of the foot being directed downward (allows a person to stand on their toes)
Created by: dmdisme