1 Supralaryngeal Anatomy. 2 Muscles of Face Facial muscles are devoid of facial sheaths...
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Transcript of 1 Supralaryngeal Anatomy. 2 Muscles of Face Facial muscles are devoid of facial sheaths...
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Supralaryngeal Anatomy
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Muscles of Face
• Facial muscles are devoid of facial sheaths (characteristic of skeletal muscle)
• Size, shape & extent of development depend on– age
– dentition
– sex
• Lips are most mobile
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Facial Muscles
Risorius
LevatorLabii
Superioris
DepressorAnguliOrisMentalis
OrbicularisOris
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Orbicularis Oris• Principal muscle acting on the lips• Oval ring of muscle encircling mouth• Paired: upper & lower muscles (superior
& inferior), functional differentiation• Acts as point of insertion for many other
muscles• Function: Protrude & close lips,
compress, contract, extend, rounding
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Obicularis Oris
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Buccinator
• “Bugler’s muscle”
• Lies deep to the risorius
• Originates on the pterygomandibular ligament
• Inserts into the lower orbicularis oris
• Function: Compresses the lips & cheeks against the teeth & draws the corners of mouth laterally; primarily involved in mastication, moves food onto grinding surface of the molars, contraction constricts the oropharynx
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BuccinatorPterygomandibular
Ligament
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Levator Anguli Oris
• Arises from the canine fossa of the
maxilla (lower part of orbit)
• Inserts into upper & lower lips
• Function: Draws the corner of the mouth
up and medial-ward (spreads lips)
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Levator Anguli Oris
Canine Fossaof Maxilla
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Levator Labii Superioris
• Originates from the infraorbital margin
of the maxilla (lower part of orbit)
• Insertion into the mid-lateral region of
the upper lip
• Function: Elevation of the upper lip
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Levator Labii Superioris Infraorbital margin
of Maxilla
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Zygomatic Major
• Arises on the zygomatic bone
• Courses obliquely
• Inserts into the corner of the obicularis oris
• Function: Elevates and retracts the angle of the mouth, as in the gesture of smiling
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Depressor Labii Inferioris
• Originates oblique line of mandible, runs upward
• Insert into the lower lip and orbicularis oris
• Function: Depresses the corners of the mouth and, by virtue of attachment to lower lip, help compress the lower lip to the upper lip
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Depressor Labii Inferioris
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Mentalis
• Origin from incisive fossa of mandible, inserting into skin of chin below (lower gum in area of mandibular teeth)
• Function: contraction elevates and wrinkles the chin and pulls the lower lip out
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Masseter
• Originates for zygomatic arch
• Insert into angle & lateral surface of the
ramus of the mandible
• Function: Closes jaw & retracts the
mandible
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Masseter
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Facial Muscles• Obicularis oris, inferior & superior muscles:
– Lip protrusion, closure, retraction, elevation & depression
• Risorius & Buccinator:– Assist in retraction of the lips & support entrapment of air
within the oral cavity
• Levator labii superioris, zygomatic minor:– Elevate upper lip
• Depressor labii inferioris:– Depresses lower lip
• Zygomatic major:– Elevates & contracts corners of mouth
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Muscles of the Mouth
• Extrinsic & intrinsic muscles of the
tongue
• Muscles for soft palate elevation
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Tongue
• Occupies the floor of the mouth
• Extrinsic muscles: moves tongue into different positions or regions in the mouth
• Intrinsic muscles: Shapes tongue into contours; fine graded control of the articulatory gestures
• Primarily involved in mastication & deglutition– Movement of food– Position food for chewing– Propel it backward for swallowing
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Tongue• Dorsum: Superior surface
• Tip or Apex: Anterior-most portion
• Base: In oropharynx
• Palatine surface: Portion of surface in oral cavity; 2/3 of tongue
• Lingual Frenulum: Underside of tongue; Joins inferior tongue & mandible; stabilizing tongue during movement
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Intrinsic Tongue Muscles
• Two pairs of muscles running
longitudinally, transversely & vertically
• Interact in a delicate fashion to produce
the rapid, delicate articulations for
speech & nonspeech activities
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Intrinsic Tongue Muscles
• Superior Longitudinal:– Courses along the length of tongue
– Upper layer of tongue
– Originates from fibrous submucous layer near epiglottis
– Fibers fan forward & outward to insert into the lateral margins of the tongue & apex region
– Function: Elevate tongue tip, pulls tongue to one side (toward side of contraction)
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Superior & Inferior Longitudinal Muscles
Superior
Inferior
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Intrinsic Tongue Muscles
• Inferior Longitudinal Muscle:– Originates at the root of the tongue & corpus
hyoid
– Fibers course to apex of tongue
– Occupies lower sides of tongue (absent in medial tongue base)
– Function: Depresses tongue tip; assist in retraction of the tongue; Contraction to one side pulls tongue in that direction & downward
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Intrinsic Tongue Muscles
• Transverse Muscles:
–Function: to narrow tongue; Pulls
edges toward midline
–Fibers originate at the median fibrous
septum & course laterally to insert into
side of the tongue
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Transverse & Vertical Muscles
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Intrinsic Tongue Muscles
• Vertical Muscles:
– Run at right angles to the transverse
muscles
– Course from base of tongue and insert into
the membranous cover
– Function: Flatten tongue; Pulls tongue
down into the floor of the mouth
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Intrinsic Tongue Muscles
Vertical Muscles
Inferior LongitudinalTransverse
Muscles
Coronal
Superior Longitudinal
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Extrinsic Muscles
• Genioglossus:– Prime mover, most of deeper bulk
– Arises from inner mandibular surface and fans to insert into the tip & dorsum of the tongue
– Medial position
– Function: • 1. Withdraw tongue into mouth
• 2. Pull tongue tip down, lower the tongue
• 3. Protrude the tongue
• 4. Pull tongue root & dorsum anteriorly
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Genioglossus
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Extrinsic Muscles
• Hyoglossus:
– Arises from greater cornu & lateral body of the hyoid
– Inserts into the sides of the tongue between the styloglossus & inferior longitudinal
– Function: Pulls sides of tongue down
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Hyoglossus
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Extrinsic Muscles
• Styloglossus:
– Originates from antero-lateral margin of
styloid process
– Inserts into inferior sides of tongue;
divides to insert into inferior longitudinal
& hyoglossus
– Function: Draws tongue back & up
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Styloglossus
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Extrinsic Muscles
• Palatoglossus:
– Muscle of the tongue & velum
– Function: Depress the soft palate or
elevating the back of the tongue
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Palatoglossus
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Velopharyngeal Anatomy
• Soft palate & its relationship with the pharyngeal wall
• Muscles here run from skull and insert somewhere in palate
• Muscles important for speech-Cleft palate
• Three sounds in English that require velum to be depressed- n, m, ing
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Reading/Assignments
• Seikel: Pgs. 305-319
• Dickson: Pgs. 222-250