What is the eardrum in psychology?
The Eardrum, or tympanic membrane, is a thin flap of skin at the end of the ear canal. When sound waves hit the eardrum it creates vibrations that travel through the middle ear to the inner ear. The inner ear then sends a message to our brain about what we are hearing.
How was ear developed?
The ear develops from the first pharyngeal pouch and six small swellings that develop in the early embryo called otic placodes, which are derived from ectoderm. The ear may be affected by disease, including infection and traumatic damage.
What are the 2 most prominent landmarks that can be seen when viewing the eardrum?
When you study a normal eardrum with an otoscope, several landmarks are easy to see. The malleus provides two—the lateral process and the long arm (manubrium).
Which theory explains secondary acquired cholesteatoma?
The squamous metaplasia theory proposes that desquamated middle ear epithelium transforms into keratinizing stratified squamous epithelium secondary to chronic or recurrent otitis media , thereby leading to the formation of a cholesteatoma.
What is the purpose of the eardrum?
The tympanic membrane is also called the eardrum. It separates the outer ear from the middle ear. When sound waves reach the tympanic membrane they cause it to vibrate. The vibrations are then transferred to the tiny bones in the middle ear.
What is the most important part of the ear?
The middle ear is important because it is filled with numerous air spaces, which provide routes for infections to travel. It is also the location of the Eustachian tube, which equalizes the air pressure between the inner and outer surfaces of the tympanic membrane (eardrum).
When does the ear develop?
sixth week of
Embryology. The external ear develops during the sixth week of gestation and is completely developed by the 20th week. Six hillocks fuse to form the basic units of the pinna.
What are the 7 parts of the ear?
The parts of the ear include:
- External or outer ear, consisting of: Pinna or auricle. This is the outside part of the ear.
- Tympanic membrane (eardrum). The tympanic membrane divides the external ear from the middle ear.
- Middle ear (tympanic cavity), consisting of: Ossicles.
- Inner ear, consisting of: Cochlea.
Is the eardrum transparent?
The ear drum is often transparent and looks like a stretched piece of clear plastic. The drum is approximately the size of a dime, with the newborn ear drum the same size as the adult. The malleus is the middle ear bone which is attached to the drum and easily identified.
What is pars Flaccida cholesteatoma?
Pars flaccida-type cholesteatoma, or attic cholesteatoma, begins with retraction of the pars flaccida, progresses to the attic with debris accumulation, and ultimately causes bone destruction.