Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

ANA 534 External Ear

learning objectives answers to external ear

QuestionAnswer
What lines the tympanic cavity? A mucous-secreting membrane.
Name the three ossicles of the middle ear cavity in order from lateral to medial. Malleus, incus and stapes.
Name two muscles found in the middle ear cavity, their innervation and what they attach to. Stapedius, CN VII, the stapes; tensor tympani, V3, the malleus.
Name the region of the tympanic cavity found above the head of the malleus. The epitympanic recess.
Identify an anterior communication of the middle ear cavity and to what does it 
communicate? The auditory tube, the nasopharynx.
Identify a posterior communication of the middle ear cavity and to what does it 
communicate? The aditus of the mastoid antrum, mastoid air cells.
Name two nerves associated with the middle ear cavity CN VII and CN IX
What branches does the facial nerve give off to the middle ear cavity and what 
modalities do they carry? The nerve to the stapedius (motor) and the chorda tympani (taste to anterior 2/3 of tongue).
What branches does the glossopharyngeal nerve give off to the middle ear cavity and 
what fibers are carried in it? The tympanic branch that contributes preganglionic parasympathethetic fibers to the tympanic plexus.
What two major vessels have an inferior relationship to the middle ear cavity? The internal jugular vein and internal carotid artery.
What fibers travel on the surface of the internal carotid artery and to what to they 
contribute? Postganglionic sympathetic fibers (the carotid sympathetic plexus) that are contributed to the tympanic plexus.
Identify the bulge on the medial wall of the tympanic cavity and what causes it? The promontory, the cochlea of the inner ear.
Define the umbo and pars flaccida. The umbo is the point of attachment of the manubrium of the malleus to the tympanic membrane. The pars flaccida is the uppermost portion of the tympanic membrane that lacks a central fibrous layer and is therefore not as rigid.
Name one branch given off the intraosseous portion of CN VII that is NOT related 
to middle ear structures. What kind of fibers travel in this nerve? The great petrosal nerve. Preganglionic parasympathetic fibers.
Name two openings in the medial wall of the tympanic cavity and which of these 
contains the footplate of the stapes? The oval window and round window. The oval window is filled by the footplate of the stapes
What is the bony cave in the petrous temporal bone forming the middle ear called? The bony labyrinth.
What lines this cavity? The membranous labyrinth.
What fluid is found within the membranous labyrinth? Between the bony and 
membranous labyrinth? Endolymph. Perilymph.
What structure(s) of the middle ear comprise the portion dealing with hearing? The cochlea and cochlear ducts.
What structure(s) of the middle ear comprise the portion dealing with balance? The 3 semicircular canals.
The cochlear duct divides the cochlea into which two spaces? A superior scala vestibuli, an inferior scala tympani.
What is responsible for detection of sound vibrations? The organ of Corti in the flat inferior aspect of the coclear duct - the basilar membrane.
Which division of CN VIII deals with hearing? With detection of balance/ 
acceleration? The cochlear division. The vestibular division.
What specialized areas of the semicircular canals are responsible for detection of 
balance/acceleration? The maculae of the semicircular canals.
Created by: wiechartm