External and Middle Ear Flashcards
The ear consists of the following:
_______
_______
_______
External Ear
Middle Ear
Internal Ear
Another name for the Middle ear is:
Tympanic Cavity
Another name for the Internal Ear is:
Labyrinth
The Labyrinth contains the organs of _______ and _______.
Hearing and Balance
The _________ contains the organs of hearing and balance.
Internal Ear (or Labyrinth)
The External Ear consists of the _______ and the ______________.
Auricle (or pinna)
External Auditory Meatus
The _______ has a characteristic shape that allows it to collect air vibrations.
Auricle (or Pinna)
The auricle (or Pinna) consists of a thin plate of _______ _________ covered by skin. It has both ______ and _______ muscles which are innervated by the _________ nerve.
Elastic cartilage
Extrinsic and intrinsic
Facial (CN VII)
The Pinna (auricle) is innervated by ________.
(VII) Facial Nerve
The outer third of the external auditory meatus is composed of ____ _____, and the inner two-thirds is ______.
Elastic cartilage
Bone
The sensory nerve supply of the lining of the external auditory meatus is from the _____ nerve and the _______ branch of the _______ nerve.
auriculotemporal
Auricular
Vagus (CN X)
The lymph drainage of the external auditory meatus is to the ____ ______, _________, and _______ ________ lymph nodes.
Superficial parotid
Mastoid
Superficial cervical
The _______ ________ is pearly gray and concave.
Tympanic membrane
There is a depression in the center of the tympanic membrane called the _____.
Umbo
The middle ear is an air filled cavity in the _____ portion of the ______ bone.
Petrous
Temporal
The middle ear is lined with a mucous membrane and contains the ______ _______.
Auditory ossicles
The middle ear communicates in front with the nasopharynx via the _______ ______ and behind with the ______ ________.
Auditory tube
Mastoid antrum
The ______ ear can be thought of as a small room with roof, floor, anterior and posterior walls, and medial and lateral walls.
Middle
The auditory ossicles are the ______, ________, and _________.
Malleus
Incus
Stapes
The _____ is the largest of the ossicles and has a process called the ________ that is attached to the medial surface of the tympanic membrane.
Malleus
Handle
Fenestra Vestibuli means….
The oval window
The base of the ______ fits into the fenestra vestibuli.
Stapes
What are the 2 muscles associated with the ossicles?
Tensor Tympani
Stapedius
The tensor tympani originates in the ________________ and ___________.
It inserts on the _________
Wall of the auditory tube
Its own canal
Handle of the malleus
The innervation of the tensor tympani is from a branch of ____.
Its action is to ________.
V3
Dampen vibrations of the tympanic membrane
The strapedius originates from the ______ on the posterior wall of the middle ear.
It inserts on the __________.
Pyramid
Neck of the stapes
The innervation of the stapedius is from a branch of the ___________ nerve.
Its action is to:
Facial (CNVII)
Dampen the vibrations of the stapes
The ________ _____ functions to equalize pressure in the middle ear with atmospheric pressure.
Auditory tube
The ______ ________ communicates with the middle ear by way of the aditus. It communicates inferiorly with the mastoid air cells.
Mastoid antrum
When the Facial Nerve (CN VII) reaches the bottom of the internal auditory meatus, it enters the ____ _______.
The nerve runs laterally above the vestibule of the inner ear until it reaches the medial wall of the middle ear where it expands to from the _______ __________.
The nerve then bends sharply backward above the promontory.
Facial canal
Geniculate ganglion
The facial nerve descends in the posterior wall of the middle ear, behind the pyramid, where it gives a branch to the _______ muscle.
Stapedius
The bend of the facial canal is called the _______.
Genu
Which cranial nerve emerges through the sylomastoid foramen?
Facial nerve (CN VII)
The _____ ______ arises from the facial nerve just above the stylomastoid foramen.
Chorda tympani
The chorda tympani exits the middle ear through the _________ _______ to enter the infratemporal fossa to join the lingual nerve.
Petrotympanic fissure
The chorda tympani contains _____ fibers and ______ _____ fibers destined for the submandibular ganglion.
Taste
Preganglionic parasympathetic
The _______ nerve arises from the glossopharyngeal nerve just below the jugular foramen. It passes through the floor of the middle ear and onto the promontory, where it splits into branches forming the _______ plexus. The plexus supplies the mucosa of the middle ear and gives off the ______ ________ nerve, which contains _______ ________ fibers destined for the _______ ganglion.
Tympanic Tympanic Lesser petrosal Preganglionic parasympathetic Otic
The lesser petrosal nerve exits the skull through the ______ ______ and joins the _____ __________.
Foramen ovale
Otic ganglion
