Card Set Information
What are the MOBILE articulators?
Tongue, Jaw, Lips, Velum, Cheeks, Chest wall, Pharyngeal walls, Laryngeal system
What are the IMMOVABLE articulators?
Alveolar Ridge, Hard Palatte, Teeth
articulates with temporal bone (TMJ)
fuses medially during embryogenesis to form upper jaw, roof of the mouth
Floor of nasal cavity
Forms posterior nasal septum
Bridge of Nose
Forms medial aspect of orbit
What happens to VP port during speech
Reduce cross-sectional diameter of VP port, rapidly. Velar musculature generates most of movement, LPW has medial motion, PPW little motion
VP closure beteen nasals and non-nasals
VP has greater closure between non-nasal as opposed to nasals
What does muscle arrangement of velum allow?
-elevation/depression of velum
-constricting of port
-tensing/stiffening of velar surface
What is the velar sling
Levator Veli Palatini
Action of LVP
elevate and retract velum, upward and backward movemtn of velar tissue
What does the TVP do?
tense anterior velum by tension placed on the velar tendon. Opens Eustachian tube, equalization ME air pressure
What does the Musculus Uvulae do?
shortens and thickens nasal surface of velum, increases mass of velum to close VP port (lack of muscle bulk can cause leak of air through nasal cavity-hypernasality)
Anterior Frontal Arch
What does the palatoglossus do?
Lower velum or decrease distance between l and r faucial arches if tongue is stable. Elevates and retracts tongue if velum is stabalized
Posterior Faucial Arch
What does the palatopharyngeus do?
Narrows oropharynx and lowers the velum
Non speech functions of the tongue
taste, food movement, transport bolus through oral cavity
Speech functions of the tongue
Acts as valve to stop airflow, restricts airflow to produce stridents and fricatives,
tip of tongue
blade, dorsum and root
superior surface of the tongue
flap of tissue beneath apex of tongue, attached to floor of mouth
taste buds are interspersed throughout pappilae
divides the body of the tongue into anterior body and posterior root
What is a Muscular Hydrostat
an organ that lacks a skeleton of bone or cartilage
What is isovolumetric structure?
maintains a constant volume as its muscles contract
Intrinsic muscles of the tongue are responsible for...
fine muscle movements of the tongue
What acts as the articulatory rate limiter
intrinsic muscles of the tongue
Extrinsic muscles insertions and origin
insertion inside tongue
origon outside tongue
Do intrinsic/extrinsic muscles have higher innervation ratio?
What does the transversus do?
Narrows and elongates the tongue
What does the Verticalis do?
flattens the tongue and pulls it down into the floor of the mouth
What does the Superior Longitudinal do?
elevates, retracts, and deviates the apex
What does the Inferior Longitudinal do?
pulls tip of tongue downward in retraction and deviates the tongue
What is the bulk of the tongue called?
What do anterior fibers of the genioglossus do?
retract the tongue
what do posterior fibers of the genioglossus do?
protrude the tongue
what do anterior ANDposterior fibers of the genioglossus do?
depress the tongue
draws the tongue up and back
pulls sides of the tongue down
How do muscles in lower face differ from those in limbs
lack well defined insertion points, lack tendonous connections, not divided into distinct muscle group,
how are bilabials made
lip muscles seal, compress along with muscle that make up corners of mouth
How are labials made
low are labio-dentals made
lip produces an area of constriction in assosciation with upper incisors
close lips, protrudes lips, draws oral angles to midline
raises upper lip and turns it outward
Levator Labii Superior
Elevates upper lip
draws angle of mouth upward and out
what is the smiling muscle
Raise angle of the mouth
Vevator Anguli Oris
Raided and everts lower lip, wrinkles skin of chin, lip compression
Draws lower lip downward and laterally
Depressor Labii Inferior
Draws angle of mouth downward and laterally
Depressor Anguli Oris
Compresses cheeks against teeth, privides wall for oral pressure development
Retreacts angle of mouth directly posterior
Muscular sheet covering frontal bone that elevates eyebrow and wrinkles forehead
Elliptical muscle surrounding eyelid, closes eyelid
Draws eyebrow together
Wrinkle Bridge of nose
Nostril flaring muscle, widens nasal aperture
Elevate smandible, closes jaw, slow but powerful contraction
Elevates mandible, fast contraction time, shears and tears
Assists elevation/protrusion of mandible and side-to-side movement of jaw. very active during speech.
Assists in opening mouth, rocks mandible against upper maxillary segment during chewing
Jaw opener/ speech muscle (ABD AND PBD)
anterior belly digastricus, posterior belly of digastricus
elevates floor of mouth. paired muscle that forms floor of mouth
jaw opener that parallels ABD orientation