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Myology 1
Lecture 4
| Question | Answer |
|---|---|
| muscles of facial expression and mouth muscles | levator labii superioris, zygomaticus minor, zygomaticus major, levator anguli oris, risorius,depressor anguli oris,depressor labii inferioris, mentalis, buccinator, orbicularis oris, |
| levator labii superioris | mm of facial expression,main elevators of upper lip, blend with zygomaticus minor, contraction alone showing upper teeth |
| zygomaticus minor | mm of facial expression, main elevators of upper lip, blends with levator labii superioris |
| zygomaticus major | mm of facial expression, bigger than zygomaticus minor,contributes to smiling and laughing,joker mm,attaches into modiolus |
| modiolus | fibromuscular condensation roughly 1/4 lateral to angle of mouth(corner of mouth),6 muscles attach=zygomaticus major,levator anguli oris,risorius,depressor anguli oris, buccinator,orbicularis oris |
| levator labii superioris OIAN | O=inferior orbital margin of the maxilla,I=upper lip, A=elevation of upper lip=show front teeth, N=CN VII facial nn |
| zygomaticus minor OIAN | O-zygomatic bone, I=upper lip,A=elevation of upper lip=Elvis,N=CN VII facial nn |
| zygomaticus major OIAN | O=zygomatic bone,I=angle of mouth,A=elevation of angle of mouth as in smiling. also draws laterally at the angle of the mouth=up and out big smile, lauging. N=CN VII facial nn |
| levator anguli oris | aka caninus,mm of facial expression,contraction show canines like dracula, laughing, also manifest a sneer,attach into modiolus |
| levator anguli oris OIAN | O=maxilla, just inferior to the infraorbital foramen,I=angle of mouth,A=elevation of angle of mouth,N=CN VII facial nn |
| risorius | mm of facial expression,drawing angle of the mouth laterally is involved with grinning, smiling and laughing,attaches into modiolus |
| depressor anguli oris | mm of facial expression,blends into the platysma,contributes to facial expression of sadness and uncertainty,attaches into modiolus |
| depressor labii inferioris | mm of facial expression,contribute to facial expression of sorrow,doubt and irony |
| risorius OIAN | O=fascia superficial to masseter, does not attach to bone.I=angle of mouth,A=draws laterally the angle of the mouth,N=CN VII facial nn |
| depressor anguli oris OIAN | O=body of mandible,I=angle of the mouth,A=depresses the angle of the mouth.assists the risorius in drawing the angle of the mouth laterally,out and down,N=CNVII facial nn |
| depressor labii inferioris OIAN | O=mandible,slightly above depressor anguli oris,I=lower lip,A=depression of lower lip,assists in drawing the lower lip laterally and everting it, roll bottom lip out.N=CNVII facial nn |
| mentalis | mm of facial expression,contributes to facial expression of doubt,pouting,disdain |
| buccinator | mm facial express,attach into modiolus,parotid duct pierces thru to enter mouth,bilat compress cheeks against teeth,forcefully expell air,whistling,blowing up balloon,helps keep food from lingering in vestibule of mouth,puckering cheeks eat sour food. |
| orbicularis oris | mm of facial expression,attaches into modiolus,causes lips to close and protrude as in puckering or whistling |
| mentalis OIAN | O=madible,I=skin of chin,A=elevation of lower lip,eversion and protracts the lower lip,N=CNVII facial nn |
| buccinator OIAN | 2 cc's=2 Origins,O=maxiall and mandible,I=lips(buccinator mm is located in the tissue of the cheek),A=compression of cheeks(against teeth).N=CNVII facial nn |
| orbicularis oris OAN | O=surrounds the mouth,A=closes mouth and protracts lips,N=CNVII facial nn |
| muscles of mastication | all attach onto mandible,acronym=TIME,temporalis,masseter,lateral(external) pterygoid,medial(internal) pterygoid, Acronym=Time to eat dinner at 5=all mm are CNV trigeminal nn |
| synergistic mm of mastication | masseter and medial pterygoid |
| temporalis | mm of mastication,contributes to side to side grinding(lateral deviation) of mandible.tight temporalis may be involved in Headaches and TMJ dysfunction. |
| masseter | mm of mastication,big(BIG ASS MASSATER),prime mover of mandibular elevation at TMJ=close mouth,square shaped mm,superficial & deep layers,large parotid glands are superficial to masseter.proportional to its size=strongest mm in body(Dr.V disagree-tongue) |
| lateral pterygoid | mm of mastication,aka external pterygoid,lateral deviation is important for grinding and chewing food.hypertonicity could excessively pull on TMJ structures causing dysfunction. |
| medial pterygoid | mm of mastication,aka internal pterygoid,fairly thick,quadrilateral mm,fiber directions are identical to masseter but medial pterygoid is internal to mandible and masseter is external. |
| temporalis OIAN | O=temporal fossa,I=coronoid process/ramus of mandible,A=elevation of mandible, eccentrically slows depression and protraction.N=CNV trigeminal nn |
| masseter OIAN | O=inferior margins of both zygomatic bone and zygomatic arch of temporal bone.I=superficial layer to angle,ramus/deep layer wraps under mandible to coronoid of mandible.A=elevates,protracts and retracts mandible.N=CNV trigeminal nn,hing jt(glides too) |
| lateral pterygoid OIAN | O=sphenoid bone,I=mandible and TMJ,A=protraction(Dr.V also retraction)of mandible.N=CNV trigeminal nn |
| medial pterygoid OIAN | O=sphenoid bone,Internal surface of mandible,A=elevates and protracts the mandible(dr v also retraction),N=CNV trigeminal |
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