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lecture exam 3

actions of muscles

sternocleidomastoid flexes and laterally rotates head
orbicularis oculi closes eye
zygomaticus major elevates corner of the mouth upward; smiling
zygomaticus minor elevates corner of the mouth; smiling
orbicularis oris closes lips; kissing muscle
masseter closes jaw; matication
temporalis closes jaw; mastication
buccinator compresses cheek; blowing whistling,sucking
digastric (both bellies) opens mouth and depresses mandible
erector spinae group extends and laterally flexes vertebral column
quadratus lumborum flexes vertebral column laterally
anterior scalene elevates 1st tow ribs
middle scalene elevates 1st two ribs
posterior scalene elevates 1st two ribs
external intercostals elevates rib cage; inhalation
internal intercostals depresses ribs; exhalation
rectus abdominis flexes and rotates lumbar region of vertbral column
trapezius stabilizes, retracts, raises and rotates scapula
deltoid abducts shoulder
supraspinatus initiates abduction
infraspinatus lateral rotation at shoulder
teres minor lateral rotation at shoulder
subscapularis medial rotation at shoulder
teres major extends, medially rotates and adducts humerus
pectoralis major medial rotation, flexion and adduction at shoulder
latissimus dorsi medial rotation, extension and adduction at shoulder
triceps brachii extension at elbow
biceps brachii flexion at elbow and supination
brachioradialis flexion at elbow
pronator teres pronates wrist
flexor carpi radialis flexes and abducts wrist
palmaris longus flexes wrist (weak); tenses skin and fasciae of palm during hand movement
flexor carpi ulnaris flexes and adducts wrist
extensor carpi ulnaris extends and adducts wrist
extensor digitorum extends digits
extensor carpi radialis brevis or longus extends and abducts wrist
flexor digitorum supericialis flexes wrist and middle phalanges of digits 2-5
supinator assists biceps brachii to supinate forearm
biceps femoris flexes knee and extension at hip
semitendinosus flexes knee and extension at hip
semimembranosus flexes knee and extension at hip
rectus femoris extends knee and flexes thigh at hip
vastus lateralis extends knee
vastus intermedius extends knee
vastus medialis extends knee
psoas major flexes hip and flexes vertebral column laterally
iliacus flexes hip
gluteus maximus extends and laterally rotates hip
gluteus medius abducts and medially rotates hip
tibialis anterior dorsiflexes foot
gastrocnemius plantarflexes (ankle extension)
Created by: alfinia