-
muscles of articulation
- controlling the lips
- protrusion / retraction
- opening / closing
- lower face and neck
-
muscles of articulation
insertion
in or near the lips
-
muscles of articulation
exhibit
functional unity
-
muscles of articulation
directionality
- transverse
- angular
- vertical (labial)
- parallel
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
mentalis
- vertical
- o - mandible below incisors
- c - downward
- ins - chin
- inn - VII Facial
- f - raises lower lip, everts (protrudes) lower lip, wrinkles chin
-
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
-
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
-
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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