Laryngeal Anatomy Flashcards
What are the two major functions of the hyoid bone?
Supports the root of tongue
Support the larynx
What is the main function of the epiglottis?
Protects airways during swallowing
Which cartilage attaches to the epiglottis and where is it attached?
The thyroid cartilage attaches to epiglottis
It’s attached at the thyroid arch via the thyroepiglottic ligament
T/F: intrinsic muscles have all of their muscles in the larynx
True
T/F: extrinsic muscles have all of their muscles in the larynx
False! They have one muscle in the larynx and the other muscle outside of the larynx
Name the ONLY laryngeal abductors
Posterior cricoarytenoids muscle
Vocal fold abduction is what?
When the vocal folds open
ADDuction is when the vocal fold closes
Do thyrohyoid muscles elevate or depress the larynx?
TRICK QUESTION
It can do either BUT it depends on what the muscles around it are doing
Which cranial nerve innervates the posterior cricoarytenoids muscles?
CN X(recurrent laryngeal nerve)
It ALSO inner at the lateral cricoarytenoids and the interarytenoids
Which muscles ADDUCT the vocal folds?
Lateral cricoarytenoids AND interarytenoids muscles
STUDY INSERTIONS AND ORIGINS OF ALL MUSCLES!!
Use the worksheet created for assignment one!!!
Which CN innervates the larynx?
CN X-vagus nerve
What two functions are provided by CN X to the larynx?
- Sensory innervation
2. Motor innervation to intrinsic laryngeal muscles
Which two branches of the VAGUS nerve serve the larynx?
Superior laryngeal nerve and the recurrent laryngeal nerve
What are the three functions of the larynx?
Protects the airway
Phonation
Pressure valving
What does the superior laryngeal branch of CN X do?
Internal: sends sensory info from supraglottic area of the larynx
External: motor innervation to the cricothyroid
AND inferior pharyngeal constrictor
Sensory info from inferior pharyngeal constrictors
What does the recurrent branch of CN X do?
Motor innervation to ALL intrinsic laryngeal muscles EXCEPT cricothyroid
And sensory from infraglottic larynx
Which part of the vocal folds really vibrate?
Superficial layer
Name the five layers of the vocal folds
Epithelium- outer layer/thin stiff capsule Superficial layer-lamina propria Intermediate layer-Lamina propria Deep layer lamina propria Thyroarytenoid layer
Name the three layers of the vocal folds
Cover-epithelium and superficial lamina propria
Transition-intermediate and deep lamina propria
Body-vocalis muscle (thyroarytenoid)
T/F: does ADDuction occur whenever a voice sound occurs?
True!
Which muscles helps with medial addiction?
Thyroarytenoids
This muscle
What is the vertical phase difference?
It is when the top of the vocal folds are opening the bottom of the vocal folds are beginning to close
How do the vocal fold open AND close? (I.e bottom to top or top to bottom)
Bottom to top AND from anterior to posterior
