Deep Neck Flashcards
What is the rima glottis?
-opening between the true vocal cords and arytenoid cartilage
What does the cricothyroid do?
-stretch and tense vocal ligament
What does the thyro-arytenoid do?
-relaxes vocal ligament (medial part is vocal is m)
What does the posterior crico-arytenoid do?
-abducts vocal ligament (opens rima glottis)
What do the lateral crico-arytenoid do?
-adducts vocal folds (closes rima glottis)
What do the transverse and oblique arytenoids do?
-adducts arytenoid cartilages (closes rima glottis)
What does the vocal is muscle do?
-relaxes posterior vocal ligament while maintaining tension of anterior part
What are the two branches of the vagus nerve that innervate the larynx?
- superior laryngeal n
- recurrent laryngeal n
What is the function of the superior laryngeal nerve?
Internal branch (internal laryngeal n) -sensory to glottis and the laryngeal vestibule and vocal folds
External branch (external laryngeal n) -motor to cricothyroid muscle
What is the function of the recurrent laryngeal nerve?
- motor to all other laryngeal muscles
- sensory to subglottis
How many anatomical stages to swallowing are there?
3
What is stage one of swallowing?
-the bolus is compressed against the palate and pushed from the mouth into the oropharynx, mainly by movements of the muscles of the tongue and soft palate
What is stage two of swallowing?
- involuntary and rapid
- soft palate is elevated, sealing off the nasopharynx from the oropharynx and laryngopahrynx.
- they pharynx widens and shortens to receive the bolus of food as the suprahyoid muscles and longitudinal pharyngeal muscles contract, elevating the larynx
What is stage three of swallowing?
- involuntary
- sequential contraction of all three pharyngeal constrictor muscles forces the food bolus inferiorly into esophagus
What does the fourth and sixth pharyngeal arch form?
- thyroid cartilage
- cricoid cartilage
- arytenoid cartilage
- corniculate cartilage
- cuneiform cartilage
