6, 2, 4
Across the superior portion of the middle ear, it is about __ mm, then it narrows to about __ mm, and at the base or bottom it is about __ mm.
What is the thin piece of bone at the superior margin of the middle ear cavity? It forms the roof of the tympanic cavity.
This is an air-filled space between the upper portion of the middle ear and the mastoid cells. It is made of quite porous bone.
superior-tegmental, inferior-jugular, posterior-mastoid, anterior-cartoid, lateral-membraneous, medial-labrynthian
What are the six walls of the middle ear cavity?
jugular fossa, jugular wall
What is the large groove that accommodates the jugular vein? On what wall is it?
aditus to antrum, fossa incudis, pyramidal eminence
What structures are associated with the mastoid wall of the middle ear cavity?
aditus to antrum
Near the top of the mastoid wall is an opening to the mastoid process. What is this opening called?
This is the grooved out area of the mastoid wall. It is on the lower lateral portion of the wall. It accommodates the short process of the incus.
What is the opening in the mastoid wall that allows a tendon of the stapedius muscle to enter?
on the outside, or to your right
In relation to the body, where is the membranous wall of the middle ear cavity?
The is a branch of the VII nerve. It goes under the incus body and on top of the manubrium to carry information from the anterior portion of the tongue to the central nervous system.
cochleariform process, auditory tube opening
What structures are associated with the carotid wall if the middle ear cavity?
This canal on the carotid wall allows a tendon of the tensor tympani muscle to enter middle ear. It is located on the top lateral corner.
on the inside, or to your left
In relation to the body, where is the labryinthian wall of the middle ear cavity?
promontory, fenestra vestibuli, fenestra rotunda, two prominences, and a semi canal
What are the structures associated with the labryinthian wall?
In the upper anterior corner of the labryinthian wall is a partial canal for what muscle?
lateral semicircular canal and the facial VII nerve
On the upper posterior wall of the labryinthian wall are two prominences. What are they for?
This is a large protuberance from the labryinthian wall out into the middle ear cavity that is caused by the basal turn of the cochlea.