Chapter 4 Flashcards
Whats the energy source for speech ?
The respiratory system is the energy source for speech
•You cannot have sound without energy
•Lungs provide the driving force for the vocal folds
•Try making your vocal folds vibrate without expiring!
Phonetion
sound production involving the larynx
What happens to the vocal folds during phonation ?
During phonation vocal fold vibration causes waves of sound pressure that are the basic sound source for voice and speech
How many layer and whats the deepest layer to the vocal folds ?
5 layers of tissue w deepest layer=muscle
•Glottis
–Space between the folds
–Most important laryngeal space for speech
–Defined by the variable sphincter that allows voicing
How do the vocal folds vibrate ?
As air passes between the vocal folds, they may be made to vibrate (video)
Subglottal (subglottic)
Area below the vocal folds
Where is the vocal mechanism housed ?
The vocal mechanism is housed in the larynx
•Larynx is the top cartilaginous portion of trachea
Biological function kf the larynx ?
Lifting
•Expelling foreign objects (coughing)
•Defecation, birth
Nonbiological function of the larynx
Sound source
–Provides the source for voiced speech
Voiceless sounds ?
Produced without use of vocal folds (e.g., /s/, /f/)
Voiced sounds ?
Produced by action of vocal folds (e.g., /z/, /v/ & all vowels)
Structure of the larynx?
Musculo-cartilaginous structure
•Located at the top of the last ring of the trachea
•Adjacent to cervical vertebrae 4
through 6
Length of the larynx
Average length of larynx
–44 mm - 36 mm (gender dependent)
Unpaired and paired cartilages lined with mocus membrame?
3 unpaired and 3 paired cartilages lined with mucous membrane
•Unpaired: epiglottis, cricoid, thyroid
•Paired: arytenoid, corniculate and cuneiform
Connective laryngeal tissue
Thyrohyoid membrane •Lateral thyrohyoid ligament •Median thyrohyoid ligament •Hyo-epiglottic ligament •Thyroepiglottic ligament •Cricotracheal membrane
Laryngeal Landmarks
Vallecular sinuses or vellecute
Ary-epiglitic folds
Pyriform sinuses
Vocal fold layers
The vocal folds have layers:
–Squamous epithelium
–Lamina Propria
•Superficial layer (random orientation elastin)
•Intermediate layer (AP orientation elastin)
•Deep layer (collagen)
–Thyrovocalis of the thyroarytenoid muscle
Vocal ligaments consists on
Intermediate layer Lamina Propria
–Deep layer Lamina Propria
Mucosal lining of vocal fold consist of
Epithelial lining
–Superficial layer Lamina Propria
The cover consist of
Epithelial lining
–Superficial layer Lamina Propria
–Intermediate layer Lamina Propria
Body of vocal folds
Deep layer Lamina Propria
–Thyrovocalis
Venteicles or landmarks of vocal folds
Aditus laryngis – laryngeal entrance
•Laryngeal vestibule – b/w aditus and ventricular folds
•Laryngeal ventricle - b/w ventricular folds and true folds
Glottis
space between vocal folds
–Anterior commissure – anterior aspect of the glottis
–Posterior commissure – between the arytenoids
–Membraneous glottis – anterior 3/5
–Cartilaginous glottis – posterior 2/5
Where does the arytenoid cartilages sit ?
Paired arytenoid cartilages sit on the cricoid cartilage
thin portion in anterior aspect that widens in posterior aspect
Arytenoids articulate with cricoid on this posterior aspect
Arytenoids have 3 major parts
Apex, muscular process and vocal process
Corniculate cartilages articulate with arytenoids at the apex
Cricoid Cartilage
Shaped like a signet ring
Sits above the top-most tracheal ring
Forms the base of the larynx
Arytenoid Cartilages
Ride atop cricoid cartilage
Articulate with cricoid
Vocal folds attach to them
Landmarks Of Arytenoid Cartilage
Anterior: vocal process
Apex
Muscular process
Articular facets: bottom of arytenoid