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26 terms

ch 10 muscles of the head, neck, and trunk

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muslces of the head
masseter
temporalis
buccinator
occipitofrontalis
galea aponeurotica
orbicularis oris
orbicularis oculi
orbicularis oculi
blinking
occipitofrontalis
retracts scalp, elevates eyebrows
orbicularis oris
closes lips
temporalis
elevate the mandible
temporalis OI
O: cranium
I: coronoid process of mandible
masseter
elevate the mandible
masseter OI
O: zygomatic arch
I: mandibular ramus
buccinator
compresses cheek against teeth (fish face)
muscles of the neck
sternocleidomastoid
platysma
levator scapulae
platysma
depresses lower lip
sternocleidomastoid action
rotate or tilt head
sternocleidomastoid OI
O: sternum
I: mastoid process
muscles of the abdomen
rectus abdominus
external oblique
internal oblique
transverse abdominus
linea alba
rectus abdominis
vertical, straplike
linea alba
rectus abdominis OI
O: pubic symphysis
I: xiphoid process
external oblique
superfical
downward
external oblique OI
O: ribs
I: iliac crest; pubic symphysis
4 pairs of sheetlike muscles
external oblique
internal oblique
transverse abdominis
rectus abdominis functions
support the viscera
stabilize the vertebral column
help in respiration, urination, defecation and childbirth
internal oblique OI
O: iliac crest
I: ribs; costal
cartilage
transverse abdominal OI
horizontal fiber orientation
deepest layer
O: iliac crest
I: linea alba
muscles used in breathing
diaphragm
external intercostals
internal intercostals
external intercostals
extend downward and anteriorly from rib to rib
pull ribcage up and outward during inspiration
internal intercostals
extend upward and anteriorly from rib to rib
pull ribcage downward during forced expiration
diaphragm
Muscular dome between thoracic and abdominal cavities
Muscle fascicles extend to a fibrous central tendon
diaphragm/ contraction
Contraction flattens it
increases the vertical dimension of the thorax drawing air into the lungs