Muscle Memory Flashcards
raises eyebrows, wrinkles forehead
frontalis
origin: galea aponeurotica
insertion: skin of eyebrows, nose
raises corner of mouth (smiling)
zygomaticus
origin: zygomatic bone
insertion: skin and muscle at corner mouth
close eyelids
orbicularis oculi
origin: frontal & maxillary bones and ligaments around orbit
insertion: eyelid tissue
puckers mouth (kissing)
orbicularis oris
origin: mandible & maxilla
insertion: encircles mouth
opens and closes the mouth
masseter
o: zygomatic bone
i: ramus of mandible
opens and closes the mouth
temporalis
o: temporal fossa
i: coronoid process of mandible
rotates head laterally
sternocleidomastoid
o: sternum & clavicle
i: mastoid process
extends the head
splenius
o: spine c7 - t6
i: masoid process and spine
flexion and rotation at waist - stabilizes pelvis during walking
rectus abdominis
o: pubis
i: sternum & ribs 5-7
flexion and rotation of trunk
external oblique
o: lower 8 ribs
i: linea alba & pubic crest
flexion and rotation of trunk
internal oblique
o: lumbar, iliac crest & inguinal ligament
i: linea alba, pubic crest & last 3-4 ribs
flattens on contraction:
increases volume of thorax - inspiration
diaphragm
o: lower edge of rib cage, lumbar
i: central tendon
raises rib cage:
increases thoracic volume - inspiration
external intercostals
o: inferior border of rib above
i: superior border of rib below
pulls rib cage down:
decreases thoracic volume - forced expiration
internal intercostals
o: superior border of rib below
i: inferior border of rib above
raises rib cage in forced inspiration
pectoralis major
o: sternal end of clavical
i: humerus
