Larynx Flashcards
Larynx
Location
Functions
- Midline opposite C3-6
- Larger in males
- Functions- prevents food from entering airway
- Phonation of voice box
Larynx regions
3
- Vestibule
- Near epiglottis
- Ventricle
- Region of vocal cords
- Infraglottic
- Inferior to glottis
What are the 3 unpaired cartilages
Thyroid
Circoid Epiglottic
Thyroid cartilage
Type
Location
Hyaline cartilage
Larget pharyngeal cartilage
Lies between C4-C6
Thyroid cartilage
Connects…
What passes through
- Connects to hyoid bone via thryrohyoid membrane
- Passing through the thyrohoid membrane
- Superior laryngeal nerve
- Superior laryngeal a.
Thyroid cartilage landmarks
Layngeal prominence (Adams apple)
Oblique line
Thyroid notch
Circoid cartilage
Type location
Hyaline cartilage
Most inferior laryngeal cartilage
Lies at C6
What attaches to circoid cartilage
Intrinsic and extrinsic laryngeal muscles
Epiglottic cartilage
Type
Loction
Innervation
Leaf shaped elastic cartilage at root of tongue
Covered in uscous membrane
Taste buds CN X
3 Paired Cartilages
Arytenoid
Corniculate
Cuneiform
Arytenoid cartilage
type
Forms
Hyaline cartilage
Forms framework for true vocal cords
Cuneiform Cartilage
type
Location
Elastic cartilage
Superior to corniculate cartilages
True vocal cord or voccal fold
Vocal ligament and vocalis muscle
Inferior to false vocal cord
Involved in sound production
False vocal cords or vestibular fold
Free edge or quadrangular membrane or vestibular ligament
No role in vocalization
Rima Vestibuli
what is it and whats between
Triangular opening
Between vestibular folds (false vocal cords)
Rima glottidis
Narrower triangular opening
Between vocal folds (Vocal cords)
Primary function of Intrinsic laryngeal muscles
Regulate tension on vocal cords
Extrinsic muscles of Larynx
and asction
- Raise larynx
- Suprahyoid
- Stylopharyngeus
- Depress larynx
- Infrahyoid muscles
Circothyroid****
Action
Innervation
- Intrinsic muscle of pharynx
- Increases tension on vocal ligaments
- Only laryngeal muscle innervated by Superior laryngeal (branch of CNX)
What innervates all laryngeal muscles
Which is the exception
Recurrent laryngeal nerve branch of CN X
Cicothyroid is the exception
Posterior circoarytenoid action
Opens rim glottidis
Maintain an airway through the larynx
Lateral Circoarytenoid action
Closes (adducts) rima glottidis
Tranverse arytenoid
Closes rima glottidis
Oblique arytenoid action
Closes rima glottidis
Vocalis action
Adjusts tension on vocal ligaments
Which muscles help close laryngopharyngeal opening
Aryepiglotticus
Thyroepiglotticus
Thyroarytenoid action
Decreases tension of vocal ligaments
Arterial supply of Larynx***
- Superior laryngeal artery
- Branch of superior thyroid, ECA
- Passes through the thyrohyoid membrane with branch of supeprior laryngeal nerve and superior laryngeal vein
- Inferior laryngeal artery
- From inferior thyroid of thyrocervical trunk
- Travels with recurrent laryngeal nerve and recurrent laryngeal vein
