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