335 7.1 Muscles or Articulation

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Author:
shanamd2010
ID:
136957
Filename:
335 7.1 Muscles or Articulation
Updated:
2012-02-27 11:39:32
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Muscles articulation
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Description:
muscles of articulation
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  1. muscles of articulation
    • controlling the lips
    • protrusion / retraction
    • opening / closing
    • lower face and neck
  2. muscles of articulation
    insertion
    in or near the lips
  3. muscles of articulation
    exhibit
    functional unity
  4. muscles of articulation
    directionality
    • transverse
    • angular
    • vertical (labial)
    • parallel
  5. orbicularis oris
    • oral sphincter
    • o - corner of lips
    • c - laterally
    • ins - opposite corner of lips
    • inn - VII facial
    • f - closes mouth; compress lips; protrudes lips
  6. buccinator
    • transverse - cheek muscle; lateral walls of buccal cavity
    • o - pterygomandibular ligament
    • c - forward
    • ins - upper and lower orbicularis oris at corner of mouth
    • inn - VII Facial Nerve
    • f - retracts lips; compresses lips
  7. risorius
    • transverse
    • o - posterior region of face; masseter muscle fascia
    • c - forward
    • ins - corner of mouth, orbicularis oris
    • inn - VII Facial Nerve
    • f - retracts lips at corner of mouth
  8. levator labii superioris
    • quadratus labii superioris
    • angular
    • o - infraorbital margin (of the) maxilla and zygomatic bones
    • c - downward
    • ins - upper lip near the midline
    • inn - VII Facial
    • f - elevates upper lip
  9. levator labii superioris alaeque nasi
    • longest name of any human muscle
    • angular
    • o - infraorbital margin and frontal process of the maxilla
    • c - vertically / downward
    • ins - corner of the nose; mid-lateral region of upper lip (orbicularis oris)
    • inn - VII Facial Nerve
    • f - elevates upper lip; sneer of Elvis
  10. zygomatic major
    • angular
    • o - zygomatic bone; lateral to the zygomatic minor
    • c - obliquely downward
    • ins - corner of mouth (OO)
    • inn - VII Facial Nerve
    • f - elevates and retracts the corner of the mouth
  11. zygomatic minor
    • angular
    • o - facial surface of the zygomatic bone
    • c - downward
    • ins - mid-lateral region of upper lip (OO)
    • inn - VII Facial Nerve
    • f - elevates the upper lip
  12. depressor labii inferioris
    • aka quadratus labii inferioris
    • angular
    • origin - mandible near mental foramen
    • course - upward
    • ins - lower lip
    • inn - VII Facial
    • f - depresses lower lip and retracts lower lip
  13. mentalis
    • vertical
    • o - mandible below incisors
    • c - downward
    • ins - chin
    • inn - VII Facial
    • f - raises lower lip, everts (protrudes) lower lip, wrinkles chin
  14. depressor anguli oris
    • vertical
    • o - mandible oblique line
    • c - fans upward
    • ins - angle of the mouth (majority of fiberes), some in the upper lip
    • inn - VII Facial
    • f - depresses corner of mouth, compresses the lips
  15. levator anguli oris
    • vertical
    • o - maxilla canine fossa
    • c - downward
    • ins - angle of the mouth in upper and lower lip
    • inn - VII Facial
    • f - elevates corner of the mouth, compresses the lips
  16. platysma
    • cheet-like, covers anterior neck
    • o - pectoral and shoulder muscle fascia
    • c - upward
    • ins - lower border of the mandible, corners of the mouth
    • inn - VII Facial
    • f - draws angle of mouth down and laterally, depresses the mandible

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