Larynx Flashcards
Larynx opens into the
Laryngo-pharynx (region just below oropharynx)
Larynx compostion
Skeletal or cartilages held together by fibrous membranes
Cricoid cartilage
Most inferior
Forms complete ring…like a signet ring
Arytenoid cartilage…articulation and how it moves
Articulates with posterior of cricoid
Rotate around vertical axis like a saloon door because of synovial articulations
2 process of arytenoid cartilage and what they do/location
Vocal process - anteriorly…attachment of vocal ligament
Muscular process - project posterolaterally
Thyroid cartilage articulations and muscle attachment points
Inferior cornu - cricoid below
Superior cornu - muscular attachment site
Oblique line on lateral side for muscle attachment as well
Laryngeal prominence formed from
Two lamina of the thyroid cartilage
Epiglotis attachment
Upper anterior border of thyroid cartilage
Epiglottis base is
Anteriorly
Thyrohyoid membrane links together
Hyoid bone and thyroid cartilage
Neurovascular structures of larynx pass through here
Cricothyroid membrane connects
Thyroid cartilage and cricoid cartilage
Swoopes up to join all 3 cartilages
Vocal ligament formed from
Upper free border of cricothyroid membrane that extends from vocal process to thyroid cartilage
Rima glotis
Space between true vocal cords (vocal ligaments covered with mucosa)
Why is rima glotis closed?
To increase abdominal pressure
Quadrangular membrnae
Spans gap between epiglottic and arytenoid cartilage
Superior edge of quadrangular membrane
Aryepiglottic fold
Laryngeal inlet boundaries formed from
Right and left aryepiglottic folds
Lower free border of quadrangular membrane forms
Vestibular fold (false vocal cord)
Ventricle of the larynx found
Between false and true vocal fold
Extrinsic laryngeal muscles and innervation
Stabilize or move larynx as a whole Ansa cervicalis (generally)
Intrinsic muscles of the larynx and innervatio
Alter positions of one part relative to another
Sometimes create sphincters to protect tract or raise pressure
Also adjuest vocal ligaments
CN 10
Posterior cricoarytenoid muscle arises from and attaches to
Posterior aspect of cricoid cartilage and attaches to muscular process of arytenoid
Functions of posterior cricoarytenoid muscle and innervation
Rotate the arytenoid process and abduct the vocal folds
Recurrent laryngeal branch of CN 10
Cricothyroid muscle function and innervation
Puts tension on thyroid cartilage and raises pitch of voice
External laryngeal nerve
Lateral cricoarytenoid muscle function and innervation
CN 10
Adducts vocal folds
Transverse and oblqiue arytenoid muscles function and innervation
CN 10
Adducts vocal folds
Vocalis runs along
True vocal fold
Attaches to vocal process of arytenoid
Vocalis function and innervation
Adduction of vocal cords and also draws arytenoid cartilage anteriorly to relax vocal cords
CN 10
Superior laryngeal nerve
Common motor and sensory trunk of the larynx
Superior laryngeal nerve divides to
Internal and external laryngeal nerve
Motor fibers of larynx innervation
Recurrent laryngeal except cirocthyroid
Cricothyroid - external laryngeal
Pharynx vs. larynx CN innervations
Larynx - 10
Pharynx - 9 and 10
Internal laryngeal nerve supplies sensory to…where does it run
Mucous membrane above true vocal folds
Pierces thyrohyoid membrane with superior laryngeal artery
Recurrent laryngeal nerve supplies sensory to…where does it run?
Below true vocal folds
With inferior laryngeal artery
Larynx blood supply
Superior laryngeal branch of superior thyroid artery from external carotid artery (1st branch)
Inferior thyroid artery from thyrocervical trunk from subclavian artery
