Lecture 31b Flashcards
2 parts of external ear
auricle (pinna) and external acoustic meatus
parts of auricle
helix, antihelix, concha, tragus, antitragus, lobule
outer portion of the external acoustic meatus is cartilaginous and secretes a waxy material called
cerumen
the middle ear consists of 3 bones called
ossicles
roof of the middle ear
tegmen tympani
the space directly internal to the tympanic membrane is called the
tympanic cavity
space directly above tympanic membrane is called the
epitympanic recess
eardrum
tympanic membrane
when center of tympanic membrane becomes indrawn, it creates the
umbo (point)
medial wall of middle ear is formed by
promontory, created by the base of the cochlea
2 openings associated with the promontory
fenestra vestibuli and fenestra cochlea
oval window, receives footplate of the most medial of the 3 ossicles (the stapes)
fenestra vestibuli
round window, closed by a membrane
fenestra cochlea
opening to mastoid antrum
aditus ad antrum
projection that originates at the stapedius
pyramidal eminence