Flashcards in laryngeal anatomy Deck (32):
Structure of Laryngeal System
inter-related series of muscles, ligaments, cartilages, joints, and 1 bone (hyoid bone)
Primary Biological Function
to rapidly and securely protect airflow into trachea
Secondary Biological Function
vocalization and sound source production center
thyroid, epiglottis, and cricoid
corniculate, arytenoids, cuneform
U-shaped bone suspended in upper neckforms upper framework of laryngeal system
How many wings does the thyroid cartilage have?
2 wings, including upper and lower horns
In which direction does the thyroid open?
Which other cartilage does the thyroid articulate with?
the cricoid cartilage
What's the name of the joint that is formed by the cricoid and thyroid cartilages?
the cricothyroid joint, which is a synovial/diarthrodial joint
Interactions between the Thyroid and Cricoid..
-joint allows thyroid to "rock over" the cricoid-can change vocal fold length by 25%
What kind of facets does the cricoid cartilage have for the arytenoids?
2 convex facets
2 small arytenoid cartilages artic with the cricoid cartilage
-vocal process (VFs connect here)-muscular process-apex/extension of arytenoid cart.
Where is the arytenoids articular facet located?
on the inferior surface of the muscular processmeets with the convex articular facet on the cricoid
Interactions between cricoid and arytenoid
-rocking motion of the arytenoid on the cricoid-synovial saddle joints
Which 3 ligaments affect joint motion of the arytenoid?
posterior cricoarytenoid ligament, lateral cricoarytenoid ligament, and the vocal ligament
when vocal folds move apart from eachother (when they OPEN)
when vocal folds come together (when they CLOSE)
arytenoid connection is very important to..
open and close the VFs
when the arytenoid rock forward, this causes
adduction, the vocal folds come together and close
cricothroid joint allows the thyroid to..
What shape is the epiglottis cartilage?
to deep surface of the angle of the thyroid cartilage (below the notch)
anterior surface of epiglottis attached the the body of the hyoid bone v
Function of the Epiglottis
shuts off airway to trachea when we swallow
Corniculate cartilages location
-sit on top of the apex of the arytenoid cartilages
Cuneiform cartilage location
-embedded within the aryepiglottic folds-these are the folds that form the entrance to the larynx
no funtion for vocalization or speech production in humans