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superior to lateral cricoarytenoid

passes from thyroid cartilage anteriorly to arytenoids cartilage posteriorly

superior and mot medial fibers: vocalis

o

vocalis: applied lateral and inferior to vocal ligament

o

thyroepiglotticus: thyroid cartilage to epiglottis

interior of larynx

o

cavity of larynx: 3 compartments

vestibule: compartment superior to vestibular folds

ventricle: middle compartment b/w vestibular and vocal folds

may extend into recess, the saccule

infraglottic cavity: inferior to vocal folds and continuous with trachea

o

vestibular folds (ventricular folds): superolateral to vocal cords

o

cricothyroid ligament (conus elasticus)

membrane attached inferiorly to superior border of cricoid ring

superior: thickened as vocal ligament

vocal ligament: forms basis for vocal fold

o

quadrangular membrane

b/w lateral border of epiglottic cartilage and arytenoids cartilage

free inferior border: vestibular ligament, supports vestibular fold

o

laryngeal mucosa superior to vocal cords: internal laryngeal nerve

Middle Ear

middle ear cavity =tympanic cavity

o

air space w/i temporal bone

o

boundaries

laterally: tympanic membrane

small portion superior to membrane: epitympanic recess

posteriorly: mastoid wall

superior portion of wall: open

aditus leads to antrum and air cells of mastoid process

anteriorly: auditory tube leads to nasopharynx

inferior to auditory tube and anterior to tympanic cavity = carotid canal

medially: structures of inner ear: contained w/I temporal region

inferiorly: close to jugular fossa in which superior jugular bulb is located

superiorly: roof/tegmen tympani formed by plate of petrous portion of temporal bone

separates middle ear from middle cranial fossa

each tympanic cavity: chain of 3 auditory ossicles

o

connect tympanic membrane w/ inner ear

middle ear cavity and associated recesses and air cells: covered w/ membrane

facial nerve: traverses temporal bone

o

chorda tympani: passes b/w two of auditory ossicles

covered w/ mucus membrane

crosses handles of malleus medially

suprameatal spine: posterior to superior part of external acoustic meatus

incus: strongest and intermediate of three auditory ossicles

malleus:

o

handle—attached to tympanic membrane

o

head: rises into epitympanic recess

medial wall of tympanic cavity

o

promontory: gentle elevation facing tympanic membrane

o

stapes: in the fenestral vestibuli (oval window)

connected to pyramid by stapedius tendon

o

round window (fenestra cochleae)

bottom of depression posteroinferior to promontory

o

semicircular canals

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