Muscle Actions Flashcards
orbicularis oculi action
closes eyelids
levator palpebrae superioris action
elevation of upper lip
orbicularis oris action
closes & protrudes lips
zygomaticus major action
elevates corners of mouth
zygomaticus minor action
elevation of upper lips
buccinator action
compression of cheek
occipitofrontalis action
elevates eyebrows, wrinkles forehead, moves scalp
risorius action
draws mouth corners laterally
superior rectus action
elevates & medially moves the eyes
inferior rectus action
depresses & medially moves the eyes
lateral rectus action
outward/lateral movement of eyes
medial rectus action
inward/medial movement of eyes
superior oblique action
depresses & laterally moves the eyes
inferior oblique action
elevates & medially moves the eyes
masseter action
elevates & retracts mandible
temporalis action
elevates & retracts mandible
medial pterygoid action
elevates & protracts mandible
lateral pterygoid action
protracts mandible
digastric action
opens the mouth and elevates hyoid bone
sternocleidomastoid action
flexes the cervical vertebrae
semispinalis capitis action
extends head; rotates head to opposite side
splenius capitis action
extends head; rotates head to same side
longissimus capitis action
extends head; lateral flexion and rotation of head to same side
scalenes action
flex, laterally flex, & rotate cervical vertebrae; elevate ribs 1 & 2 when inhaling
spinalis capitis action
extend vertebral column
spinalis cervicis action
extend vertebral column
spinalis thoracis action
extend vertebral column
iliocostalis cervicus action
maintains posture; laterally flexes vertebral column
iliocostalis thoracis action
maintains posture; laterally flexes vertebral column
iliocostalis lumborum action
maintains posture; laterally flexes vertebral column
longissimus capitis action
extend & rotate head; extends and laterally flexes vertebral column
longissimus cervicis action
extend & rotate head; extends and laterally flexes vertebral column
longissimus thoracis action
extend & rotate head; extends and laterally flexes vertebral column
rectus abdominis action
flexes vertebral column; flexes abdomen
external oblique action
compresses abdomen; flexes vertebral column
internal oblique action
compresses abdomen; flexes vertebral column
transverse abdominis action
compresses abdomen
diaphragm action
changes size of thorax
external intercostals action
lifts ribs during inhalation
internal intercostals action
draw ribs together during exhalation
innermost intercostals action
draw ribs together during exhalation
subclavius action
depresses/moves clavicle anteriorly; stabilizes pectoral girdle
pectoralis minor action
abducts scapula and rotates it downward
serratus anterior action
abducts scapula and rotates it upward
trapezius action
superior & inferior fibers: upward rotation and stabilization of scapula
middle fibers: adducts scapula
levator scapulae action
elevates scapula and rotates it downward
rhomboid major action
elevates & adducts scapula; rotates scapula downward and stabilizes it
rhomboid minor action
elevates & adducts scapula; rotates scapula downward and stabilizes it
pectoralis major action
adducts & medially rotates arm at shoulder
latissimus dorsi action
extends, adducts, & medially rotates arm at shoulder; draws arm inferiorly & posteriorly
deltoid action
lateral fibers: abducts arm
anterior fibers: flexes and medially rotates arm at shoulder
posterior fibers: extends and laterally rotates arm at shoulder
subscapularis action
medially rotates arm at shoulder
supraspinatus action
assists deltoid in abduction of arm
infraspinatus action
laterally rotates and adducts arm
teres minor action
laterally rotates, extends, & adducts arm at shoulder
teres major action
extends arm at shoulder; assists in adduction & medial rotation of arm at shoulder
coracobrachialis action
flexes & adducts arm at shoulder
biceps brachii action
flexes arm at shoulder; flexes forearm at elbow; supinates forearm
brachialis action
flexion of forearm at elbow
brachioradialis action
flexes arm at elbow; pronates and supinates forearm
triceps brachii action (long, medial, and lateral heads)
extends arm at elbow & shoulder
anconeus action
assists triceps brachii in extending the elbow
pronator teres action
pronates forearm; weakly flexes forearm at elbow
pronator quadratus action
pronates forearm
supinator action
supinates forearm at elbow
flexor carpi radialis action
flexes and abducts hand at wrist
flexor carpi ulnaris action
flexes and adducts hand at wrist
palmaris longus action
weakly flexes hand at wrist
flexor digitorum superficialis action
flexes middle phalanges at proximal interphalangeal joint; flexes proximal phalanges at metacarpophalangeal joint; flexes hand at wrist
flexor digitorum profundus action
flexes distal & middle phalanges at interphalangeal joint; flexes proximal phalanges at metacarpophalangeal joint; flexes hand at wrist
flexor policis longus action
flexes distal phalanges of thumbs at interphalangeal joint
extensor digitorum action
extends distal & middle phalanges at interphalangeal joint; extends proximal phalanges at metacarpophalangeal joint; extends hand at wrist
extensor carpi radialis longus action
extends and abducts hand at wrist
extensor carpi radialis brevis action
extends and abducts hand at wrist
extensor carpi ulnaris action
extends and adducts hand at wrist
thenar action
moves the pollex
hypothenar action
moves the little finger
intermediate action
moves all digits minus thumb
iliopsoas action
flexes hip joint
rectus femoris action
flexes thigh at hip joint; extends leg at the knee
vastus lateralis action
extends leg at the knee
vastus intermedius action
extends leg at the knee
vastus medialis action
extends leg at the knee
pectineus action
adducts thigh
adductor longus action
adducts thigh
adductor brevis action
adducts thigh
gracilis action
adducts thigh
adductor magnus action
adducts thigh
gluteus maximus action
extends & laterally rotates thigh
gluteus medius action
abducts & medially rotates thigh
gluteus minimus action
abducts & medially rotates thigh
semimembranosus action
extends thigh at hip and flexes knee
semitendonosus action
extends thigh at hip and flexes knee
biceps femoris action
extends thigh at hip and flexes knee
gastrocnemius action
flexes leg at knee; plantar flexes foot
plantaris action
flexes leg at knee; plantar flexes foot
soleus action
plantar flexes foot
tibialis posterior action
plantar flexes and inverts foot
flexor digitorum longus action
plantar flexes foot & flexes toes
flexor hallucis longus action
plantar flexes foot & flexes hallux
tibialis anterior action
dorsiflexes & inverts foot
extensor digitorum longus action
dorsiflexes foot & extends toes
extensor hallucis longus action
dorsiflexes foot & extends hallux
