335 11.1 Intrinsic Muscles of the Larynx

Home

Get App

Create

intrinsic muscles of the larynx have

both origin and insertion withint he larynx
landmarks of the larynx 10
- epiglottis
- aryepiglottic folds
- laryngeal aditus
- laryngeal vestibule
- vertricular folds / false vocal folds
- laryngeal ventricle
- true vocal folds
- conus elasticus
- glottis
- pyriform sinuses
aryepiglottic folds

membrane extending from arytenoid cartilages to epiglottis
laryngeal aditus

entryway into larynx
laryngeal vestibule

opening of larynx epiglottis and aditus but above the false vocal folds
ventricular folds / false vocal folds

located between the laryngeal vestibule and the laryngeal ventricle
laryngeal ventricle

lateral outpouching between true and false vocal folds
true vocal folds
- = thyroarytenoid muscles
- = vocal ligaments = upward extension of the conus elasticus
conus elasticus

also known as the cricothyroid membrane
glottis

space between true vocal folds
pyriform sinuses

shallow depressions lateral to aryepiglottic folds at level of vocal folds
structure of the vocal folds
5 layers
- 1. squamous epithelium - most superficial
- 2. lamina propria
- - superficial layer
- - intermediate layer
- - deep layer
- 3. thyrovocalis muscle
squamous epithelium
- most superficial extremely thin layer
- glistening white portion
- aids in hdration by retention of fluid
lamina propria
- comprised of 3 layers
- connective tissue
- superificial, intermediate, and deep layers
suprficial layer of lamina propria
- very elastic
- made of elastin fibers
- AKA Reinke's space
- very susceptible to swelling
intermediate layer of lamina propria

elastic fibers
deep layer of lamina propria

collagen fibers
thyrovocalis muscle
- deep to lamina propria
- bulk of the vocal folds
layers of the vocal folds 4
- mucosal epithelium (outer surface covering)
- superficial lamina propia (Reinke's space, covering)
- Intermediate and deep lamina propria (ligament)
- vocalis muscle (deep contractile tissue, body)
thyroarytenoid
thyrovocalis (vocalis)
- o - angle of the thyroid
- dorsal (inner) surface
- c - back
- ins - vocal process of the arytenoid
- f - independently relaxes vocal folds
- co-operatively tenses vocal folds
- inn - X vagus recurrent laryngeal branch
thyroarytenoid
thyromuscularis
- o - angle of the thyroid
- dorsal (inner) surface
- c - back
- ins - base and muscular process of the aytenoid
- f - relaxes the vocal folds
- inn - X vagus recurrent laryngeal branch
posterior cricoaytenoid
- only glottal
- lateral and medial bunches
- o - posterior lamina of the cricoid
- c - obliquely up
- ins - muscular process of the arytwnoid
- function - abducts vocal folds and pulls back arytenoid
- inn - recurrent laryngeal branch of the X Vagus nerve
lateral cricoarytenoid
- o - upper and lateral borders of cricoid arch
- c - up and back
- ins - muscular process of the arytenoid
- f - adducts the vocal folds and pulls forward on the arytenoid
- inn - recurrent laryngeal brach of X Vagus
interarytenoids (arytenoids)
transverse arytenoid
- o - lateral - posterior surface of one arytenoid
- ins - lateral - posterior surface of the other arytenoid
- f - adducts the vocal folds and pulls the arytenoids together
interarytenoids
oblique arytenoid
- o - posterior base of muscular process of one arytenoid
- c - obliquely up
- ins - apex of other arytenoid
- f - adducts the vocal folds and pulls the arytenoids together
- inn - recureent pharyngeal branch of X Vagus
cricothyroid
- two section : pars recta (vertical) and pars oblique (dorsal)
- o - pars recta - anterior surface of the cricoid beneath arch
- pars oblique - lateral to pars recta
- c - pr - up and out
- po - obliquely up
- ins - pr - lower lamina of the thyroid
- po - between laminae and inferior horns of thyroid
- f - pulls thyroid forward and down
- lengthens the vocal folds
- increases vocal tensoin
- changes pitch
- inn - superior laryngeal branch of the X Vagus

Author

shanamd2011

144457

Card Set

335 11.1 Intrinsic Muscles of the Larynx

Description

intrinsic muscles of the larynx

Updated

2012-04-02T22:38:21Z

Show Answers