larynx muscles Flashcards
what is the only muscle to increase pitch by increasing tension
cricothyroid
what is the muscle to decrese pitch?
thyroarytenoid
what is the ONLY muscles to ABduct vocal chords?
posterior cricoarytenoid
what muscles is associated with phonation?
lateral cricoarytenoid
what two muscles aDduct arytenoids closing rims glotus?
transverse arytenoid and oblique arytenoid
all laryngeal muscles are innervated by WHAT? exception?
- all innervation originates from vagus
* all muscles are recurrent laryngeal nerve EXCEPT cricothyoroid which is external laryngeal nerve
cricothyroid does what?
lengthens vocal fold, pulling them taut
posterior cricoarytenoid action?
rotates arytenoid outwardly, aBducting vocal folds (increasing rema space)
posterior cricoarytenoid originates?
medial part of posterior cricoid cartilage
posterior cricoarytenoid inserts?
muscular process of arytenoid cartilage (spans up laterally)
lateral cricoarytenoid actions?
rotates arytenoid inwardly, aDducting vocal folds, *INITIATES sound production =PHONATION
lateral cricoarytenoid origin?
lateral aspect over cricoid cartilage
lateral cricoarytenoid insertion?
muscular process of arytenoid cartilage
transverse and oblique arytenoids action?
work together to slide arytenoids together, aDducting vocal folds
*T is deep to O
thyroarytenoid action?
tilts arytenoids anteriorly, relaxing vocal folds (anterior=closer= decrease tension)
thyroarytenoid location?
located deep, lateral aspects of vocal folds (completely contained within medial part of thyroid cartilage)
***attaches to anterior inner aspect of thyroid cartilage and goes to cricoid
vocalis action
fine tuning of vocal ligament tension
superior laryngeal nerve
o comes off vagus
o branches in internal and external laryngeal nerve
external laryngeal
motor to the criciothyroid ONLY
internal laryngeal
o sensory ONLY above coal fold
o enters hole in thyrohyoid membrane
recurrent (inferior) laryngeal
o motor to ALL intrinsic muscles of larynx except criciothyroid
o sensory to below vocal fold
