larynx: laryngeal muscles Flashcards
what are the groups of laryngeal muscles?
extrinsic laryngeal muscles
intrinsic laryngeal muscles
which muscles make up the extrinsic laryngeal muscles?
suprahyoid muscles
infrahyoid muscles
function of suprahyoid muscles (extrinsic laryngeal muscles)?
elevate hyoid and larynx (swallowing + phonation)
function of infrahyoid muscles (extrinsic laryngeal muscles)?
depress hyoid and larynx (balance position of hyoid bone)
function of the intrinsic laryngeal muscles?
move the laryngeal components, altering the length and tension of the vocal cords and size and shape of rima glottidis
what are the intrinsic laryngeal muscles supplied by?
recurrent laryngeal nerve except cricothyroid muscle
what is the function of cricothyroid muscle and what is it supplied by?
tenses vocal cords
supplied by external laryngeal nerve (from superior laryngeal nerve)
vascular supply to the larynx?
from superior and inferior laryngeal arteries
what is superior laryngeal artery a branch of?
superior thyroid artery
ECA –> superior thyroid artery –> superior laryngeal artery
what does superior laryngeal artery accompany?
internal branch of superior laryngeal nerve
what is the inferior laryngeal artery a branch of?
inferior thyroid artery
subclavian artery –> thyrocervical trunk –> inferior thyroid artery –> inferior laryngeal artery
what does the inferior laryngeal artery accompany?
the inferior laryngeal nerve
venous drainage of the larynx?
superior and inferior laryngeal veins
summary of nerve, artery and veins to larynx
superior and inferior laryngeal arteries, veins and nerves
superior laryngeal nerve has internal and external branches
what does the internal branch of superior laryngeal nerve supply?
sensory to supraglottic region