ch 10 muscles of the head, neck, and trunk
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26 terms
Terms | Definitions |
|---|---|
 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 |
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