1 supralaryngeal anatomy & physiology. 2 velopharyngeal anatomy soft palate & its...
TRANSCRIPT
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Supralaryngeal Anatomy & Physiology
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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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Soft Palate
• Velum; flexible muscular flap hanging from hard palate
• Attached by the palatine aponeurosis – Sheet of flattened tendon Arrangement of muscle
fibers:• Elevates, lowers and tenses
• Three classes of muscles:– Depressor relaxers (glossopalatine & Pharyngopalatine)– Elevators (Levator Palatini & Uvular)– Depressor-Tensor (Tensor Palatini)
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Levator Veli Palatini
• Palatal Elevator, bulk of soft palate
• Arises from the temporal bone & medial wall of the eustachian tube
• Courses down to insert into the palatal aponeurosis of soft palate
• Primary elevator of the soft palate– Contraction elevates & retracts the posterior
velum
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Levator Veli Palatini
TemporalBone
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Muscularis Uvulae
• Medial & posterior portions of the soft palate
• Arises from posterior nasal spine of palatine
bone & palatal aponeurosis
• Fibers run the length of the soft palate
• Inserts into mucous membrane of the velum
• Contraction shortens the velum, bunching it
up
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Tensor Veli Palatini
• Tensor of the soft palate and dilator of the eustachian tube
• Arises from the sphenoid bone & lateral eustachian tube wall
• Terminate into a tendon that wraps around the pterygoid hammulus, then flattens to become the palatine aponeurosis
• Contraction tenses the soft palate and flattens it & dilates eustachian tube to aerate it.
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Hammulusof Pterygoid
Eustachian Tube
Tensor Veli Palatini
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Soft Palate
Levator Palatini
Eustachian Tube
TensorPalatini
Sagittal section ofVocal tract
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Palatoglossus
• Posterior of oral cavity
• Anterior faucial pillar (First arch in oral cavity)
• Serves dual purpose:– Elevates tongue or depresses soft palate
– Originates at the anterolateral palatal aponeurosis & inserts into the sides of the tongue
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Palatoglossus
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Palatopharyngeus
• Anterior fibers originate from the anterior hard palate & posterior fibers arise from the midline of the soft palate
• Insert into posterior thyroid cartilage
• Courses down and form posterior faucial pillars
• Assists in narrowing the pharyngeal cavity & lowers the soft palate & elevates larynx
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Velar Depressors
Soft Palate
Palatoglossus
Palatine Tonsil
Palatopharyngeus
AnteriorFaucial
Arch
PosteriorFaucial
Arch
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Supralaryngeal Physiology
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Introduction• Source-filter theory
–Source = generates sound (larynx)
–Filter = sound modified (vocal tract)
• Vocal tract-–Filter for all vowels and consonants
–Serves as source of noise for consonants
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Noise Generation: Source
• All consonants include an element of noise (except semi-vowels)
• Consonant that is voiced= Noise added to the voice generated at Glottal Source
• Consonant that is voiceless= Characterized entirely by noise
• Narrowing of vocal tract causes resistance to cause noise (usually in upper vocal tract)– /h/ is an exception- noise caused at the glottis
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Oral Pressure
• Two functions of vocal tract:
– Serves as a filter for all consonants & vowels
– Serves as a source of noise for most consonants
• Prerequisite for noise:
– Build pressure behind constriction or occlusion
• Intraoral air pressure (requires velopharyngeal
competence)
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Turbulent Noise
• The noise element of consonants produced
by fricatives is the result of turbulence.
– Hiss of steam
– Occurs when air channel is constricted enough
to disrupt smooth flow of air
– Turbulence if the other type of consonant noise
(bursts & turbulence)
– Place of articulation distinguishes fricatives
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Places of Articulation
H
K-G-NG
SH-ZH-L-CH-J-R
T-D-S-Z-NTHM-W-P-B
F-V
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Bursts of Noise
• Burst, a puff of air
• Air stream is stopped by tongue or lips (plosive or stop)
• Progress of stop:– Closure (tongue, lips)-Block air stream
– Pressure builds behind stoppage
– Brief gap of silence
– Stoppage is released (can be aspirated)
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Closure Stoppage Release Transition
AirstreamStoppage
Transition
SilencePlosiveBurst
Vowel
Airstream
Typical Plosive Production
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Reading/Assignments
• Seikel: Pgs. 323-326;
• Dickson: Pgs. 208-218