muscular system Flashcards
Epicranius (head and neck)
frontalis & occipitalis, epicranial aponeurosis
raises eyebrows
orbicularis oculi
closes eye
levator palpebrae superioris
opens eye
corrugator supercilii
draws eyebrows together when frowning
orbicularis oris
closes lips (kissing)
zygomaticus major
raises corner of mouth upwards (smiling)
buccinator
compresses cheek (whistling)
platysma
tenses skin of neck when shaving-pouting
superior rectus
Elevates and turns eye medially
inferior rectus
Depresses and turns eye medially
medial rectus
moves eye medially
lateral rectus
moves eye laterally
superior oblique
Depresses eye and turns it laterally
inferior oblique
Elevates eye and turns it laterally
temporalis
Closes Jaw
masseter
Prime Mover of jaw closure
pterygoids (medial & lateral)
protrude mandible and side-to-side grinding of lower teeth
sternocleidomastoid
Flexes and laterally rotates head
splenius capitis
Extends or Hyperextends head
diaphragm
Prime mover of inspiration
intercostals (external and internal)
draw ribs together
external oblique
Flex spine, rotate trunk, flex laterally, compress viscera
internal oblique
Flex spine, rotate trunk, flex laterally, compress viscera
transverse abdominus
Compress abdominal contents
rectus abdominis
flex and rotate lumbar spine
erector spinae
Prime mover of (etebral/spine (back) extension
ischiocavernosus
Retards venous drainage and maintains erection of penis and clitoris
bulbospongiosus
Empties male urethra
levator ani: pubococcygeus & iliococcygeus
Supports pelvic viscera, anal and vaginal sphincters
coccygeus
Supports pelvic viscera
pectoralis minor
Draws scapula forward and down
serratus anterior
Rotates scapula laterally and upward (punching)
levator scapulae
Elevates/adducts scapula
trapezius
Rotates, raises and retracts scapula
rhomboideus minor
Stabilize scapula, retract (adduct) scapula as in
rhomboideus major
“squaring the shoulders”
pectoralis major
Prime mover of arm flexion, rotates arm medially and adducts arm
latissimus dorsi
Prime mover of arm extension, adducts and medially rotates
deltoid
Prime mover of arm abduction
supraspinatus
Initiates abduction of arm (humerus)
infraspinatus
Rotates arm laterally
teres minor
Rotates arm laterally
subscapularis
Rotates arm medially
brachialis
A major elbow (forearm) flexor
biceps brachii
Flexes elbow and supinates forearm (rotates hand laterally)
triceps brachii
Prime mover of elbow extension (forearm)
brachioradialis
Synergist in flexing forearm
pronator quadratus
Prime mover of forearm pronation
pronator teres
Pronates forearm
supinator
Supinates forearm
flexor carpi radialis
Flexes wrist and abducts hand
flexor carpi ulnaris
Flexes wrist and adducts hand
extensor carpi radialis longus
Extends and abducts wrist
extensor carpi radialis brevis
Extends and abducts wrist
extensor digitorum
Prime mover of finger extension
extensor carpi unlaris
Extends and adducts wrist
Iliacus
Prime mover for flexing thigh (hip joint) or flexing trunk at thigh
Psoas
Same as above plus flexes vertebral column laterally
tensor fasciae latae
braces knee when walking
gluteus maximus
Major thigh extensor
gluteus maximus
Major thigh extensor
gluteus medius
Abducts and medially rotates thigh
piriformis
laterally rotates extended thigh, abducts flexed thigh
piriformis
laterally rotates extended thigh, abducts flexed thigh
adductor brevis
Adduct and medially rotate and flex thigh
adductor longus
Adduct and medially rotate and flex thigh
adductor magnus
Adduct and medially rotate and flex thigh
gracilis
Adducts thigh; flexes and medially rotates leg
rectus femoris
Extends knee and flexes thigh at hip
vastus lateralis
Extends and stabilizes knee
vasus medialis
Extends knee
vastus intermedius
Extends knee
sartorius
Flexes, abducts and laterally rotates thigh; flexes knee (sitting cross legged)
biceps femoris
Extends thigh and flexes knee
semitendinosus
Extends thigh and flexes knee
semimembranosus
Extends thigh and flexes knee
extensor digitorum longus
Prime mover of toe extension
extensor hallicus longus
Extends the big toe
tibialis anterior
Prime mover of dorsiflexion
gastrocnemius
Plantar flexes foot
soleus
Plantar flexion
flexor hallicus longus
Flexes big toe
tibialis posterior
Prime mover of foot inversion
fibularis (peroneus) brevis
Plantar flexes and everts foot
fibularis (peroneus) longus
Plantar flexes and everts foot
flexor digitorum longus
Flexes toes; plantar flexes and inverts foot