Anatomy of Organs of Hearing and Equilibrium in Petrous Portion of Temporal Bones

A series of vocabulary flashcards covering the anatomy and functions of the organs of hearing and equilibrium located in the petrous portion of the temporal bones.

External Acoustic Meatus

Opening and canal of the external ear.

Stenvers method

This position also visualize the mastoids

Styloid process

Inferior and slightly aNterior to eam

tragus

part of the external structure, it is the small liplike structure Located anterior to the EAM. It is a partial shield to the ear opening.

Eustachian tube

Passageway between the middle ear and the nasal fax

True

The purpose of the EUSTACHIAN tube is to equalize pressure

False

The Travis is also known as the PINNA

External, middle, internal

There are 3 divisions of the ear

Petrous portion

The organs of hearing and equilibrium are the main structures found within the

Mastoid process (mastoid tip)

What is posterior and inferior to the EAM of the temporal bone?

Meatus

Narrow somewhat as it meets the Tympanic membrane or eardrum

Tympanic membrane

Considered part of the middle ear even though it serves as a partition between the external and middle ears

Middle ear

Where are the three auditory ossicles located?

Malleus incus and stapes

What are the three auditory obstacles?

2 malleus, 2 incus 2 stapes hyoid bone

The seven associated bones in the middle ear

Middle ear

Communicates with nasal pharynx and mastoids

Eustachian Tube

Pathway that equalizes pressure and connects the middle ear to the nasopharynx.

Osseous labyrinth and membranous labyrinth

What are the two main parts of the internal ear?

Auditory Ossicles

Three tiny bones in the middle ear: Malleus, Incus, and Stapes.

Hammer

malleus looks like

Tooth or anvil

Incus looks like a

Stirrup

Stapes looks like

Axiolateral oblique projection

With what projections can be best demonstrated for the tube like internal acoustic canal

Stenvers method

It visualizes the mastoids tube like internal acoustic canal is what method

Auricle

Also known as the pinna; the outer flap of the ear.

Mastoid Process

Bony prominence located posterior and inferior to the external acoustic meatus.

Tympanic Membrane

Commonly known as the eardrum; partitions the external and middle ear.

Encephalitis

A serious infection of the brain that may arise from infections in the middle ear.