Flashcards in Unit VIII - Ear Pt. 1 Deck (66)
Where does sympathetic supply to the external ear come from?
Superior cervical ganglion
The middle ear is between what structures?
Tympanic membrane and inner ear
What are the two parts of the middle ear?
Tympanic cavity and epitympanic recess
What are the three small bones found in the middle ear?
Stapes, malleus, and incus
What two muscles are located in the tympanic cavity?
Stapedius and tensor tympani
What is the smallest muscle in the body?
What forms the roof/tegmental wall of the middle ear?
Petrous part of the temporal bone
What forms the floor/jugular wall of the middle ear?
Thin layer of bone separating the cavity from the internal jugular vein
The small opening in the floor/jugular wall of the middle ear serves what purpose?
Entrance for the tympanic branch of the glossopharyngeal nerve
What forms the lateral/membranous wall of the middle ear?
Almost entirely by tympanic membrane (slight bony part adjacent to epitympanic recess)
What wall of the middle ear is incomplete?
What is the opening between the tympanic cavity and the mastoid air cells?
Aditus of the mastoid antrum (in the posterior/mastoid wall)
What is the opening that the tendon of the stapedius muscle passes through and where is it located?
Pyramidal eminence; posterior/mastoid wall of middle ear
Where do we find the opening for the chorda tympani?
Posterior/mastoid wall of middle ear
The carotid wall of the middle ear separates the cavity from what vessel?
Internal carotid artery
What are the openings found in the carotid wall of the middle ear?
Large opening for pharyngotympanic tube
Opening for tensor tympani
Small exit for chorda tympani
Where does the chorda tympani enter and exit in the middle ear?
Enter - posterior/mastoid wall
Exit - carotid wall
What is the boundary between the middle ear and the inner ear?
What is the impression made by the cochlea in the labyrinthine?
What covers the promontory of the labyrinthine, and what makes it up?
Tympanic plexus; tympanic branch of C.N. IX, branches from the internal carotid plexus
What does the tympanic plexus that covers the promontory supply?
Mucous membranes of middle ear, mastoid area, and pharyngotympanic tube
Which nerve leaves the tympanic plexus and travels to the otic ganglion?
Lesser petrosal nerve
What bone attaches to the oval window on the medial wall of the inner ear?
Where are the oval and round windows located?
The prominence of the facial canal is an impression of bone that is formed by a canal conducting what nerve?
In what wall does the lateral semicircular canal form a small impression?
Medial wall (labyrinthine)
Where are the ossicles located specifically?
What is the largest auditory ossicle?
What does the malleus contact?