Flashcards in 4.6 Ear Deck (45)
What structures make up the external ear?
pinna and external acoustic meatus
What ossicle is attached to the deep surface of the tympanic membrane?
What muscle attaches to the malleus and what innervates it?
tensor tympani m. (CN V3)
What does the stapes attach to?
oval window of cochlea
What muscle attaches to the stapes and what innervates it?
stapedius m. (CN VII)
What compromises the bony labyrinth of the inner ear?
vestibule, semicircular canals and cochlea
What is the bony labyrinth filled with?
What is the membranous labyrinth filled with?
What nerve supplies the external surface of the tympanic membrane?
auricular branch (CN X)
What nerve supplies the internal surface od the tympanic membrane?
tympanic n. (CN IX)
What separates the external from the middle ear?
Which portion of the mandible can be palpated by placing the small finger into the out part of the external ear canal?
What nerve passes between the malleus and the incus?
Chorda tympani (CN VII)
What is the function of the oval window?
translates mechanical vibrations of ossicles into waves of fluid that fills cochlea
What is the function of the round window?
dissipates pressure waves generated by mechanical vibrations
How does the oval window relate to the promontory?
near upper pole of promontory
How does the round window relate to the promontory?
near lower pole of promontory
What structure forms the promontory?
initial part of spiral bony cochlea, bulges into middle ear cavity in form of round projection on medial wall of cavity
Tensor tympani m. (V3) attaches to the malleus to dampen excessive vibration of membrane caused by loud sound including ...
Stapedius m. (CN VII) attaches to the stapes and reduces excessive vibration of stapes caused by loud sound including ...
What fiber types are found in the tympanic branch of CN IX?
general sensory - mucosa of middle ear cavity and inner surface of tympanic membrane
Preganglionic parasympathetic fibers of lesser petrosal n.
The lesser petrosal n. exits the middle ear cavity through hiatus of lesser petrosal canal and enters the middle cranial fossa and then exits the cranial cavity through?
Where does the lesser petrosal n. synapse?
What nerve do the postganglionic parasympathetic fibers of the lesser petrosal n. hitch a ride on after synapsing in the otic ganglion?
auriculotemporal n. of (CN V3) to the parotid gland
What does the middle ear communicate with posteriorly?
mastoid air cells (deep to mastoid process)
What does the middle ear communicate with anteriorly?
nasopharynx via bony and cartilaginous pharyngotympanic tube
What does the lateral wall of the middle ear communicate with?
What does the medial wall of the middle ear communicate with?
has bony projections caused by lateral semicircular canal, facial canal, and cochlea (cochlear promontory)
What component of the vestibule detects position of head in space (tilt of head) by detecting gravitational pull with its horizontally oriented patch of receptors (macula)?