From an anatomical and ventilation point of view, the middle ear is divided into two compartments by the epitympanic diaphragm, consisting of the incus, the malleus, and their folds. The epitympanic diaphragm is described as the floor of the epitympanum, which is the dividing structure from the mesotympanum [1, 2, 3].

What is in the epitympanum?

Posteriorly the epitympanum is in direct continuity with the mastoid antrum via the aditus ad antrum, and thence the mastoid air cells. Its main contents are the head of the malleus and body and short process of the incus, which articulate with each other at the incudomalleolar joint.

Which structure is located in the epitympanum of the ear?

The epitympanum houses the head of the malleus and the body and short process of the incus. The floor of the middle ear is primarily composed of the bone covering the jugular bulb.

What is in the epitympanic recess?

epitympanic recess a small upper space of the middle ear, containing the head of the malleus and the body of the incus. Called also attic and epitympanum.

What is Mesotympanum?

The mesotympanum (rare plural: mesotympana) forms the main compartment of the tympanic cavity and contains most of the important structures of the middle ear, including most of the ossicular chain.

Middle ear spaces/Epitympanic recess

22 related questions found

What is mastoid antrum?

The mastoid antrum (plural: mastoid antra) (also known as tympanic antrum or Valsalva antrum) is an air space (up to 1 cm in size) lying posterior to the middle ear and connected to it by a short passageway, the aditus ad antrum.

What is Titus media?

Otitis media is inflammation located in the middle ear. Otitis media can occur as a result of a cold, sore throat, or respiratory infection.

What is Aditus ad antrum?

Anatomical terminology. The aditus to mastoid antrum (otomastoid foramen or entrance or aperture to the mastoid antrum) is a large irregular cavity that leads backward from the epitympanic recess into a considerable air space named the tympanic or mastoid antrum.

What is promontory ear?

The promontory (promontorium) is a rounded hollow prominence, formed by the projection outward of the first turn of the cochlea; it is placed between the fenestræ, and is furrowed on its surface by small grooves (Groove of promontory), for the lodgement of branches of the tympanic plexus.

How many walls does the tympanic cavity have?

The tympanic cavity is lined with mucous membrane and has the following six walls: Tegmental wall: This roof is formed by the tegmen tympani, which is part of the temporal bone. Jugular wall: This floor is formed by a bone that separates the middle ear from the internal jugular vein.

Which cranial bone contains the bony labyrinth?

The bony labyrinth (also osseous labyrinth or otic capsule) is the rigid, bony outer wall of the inner ear in the temporal bone. It consists of three parts: the vestibule, semicircular canals, and cochlea. These are cavities hollowed out of the substance of the bone, and lined by periosteum.

What causes ossicular discontinuity?

Ossicular chain discontinuity, or separation of the middle ear bones, most commonly happens when chronic ear infections dissolve the delicate middle ear bones. However, it may also happen with a skull fracture or after penetrating trauma, such as a Q-tip injury.

How do you do Myringoplasty?

How myringoplasty is performed

1. Enter the ear either through an incision behind the ear or through the ear canal, depending on the size and location of the hole and the size of your child's ear canal.
2. Use an instrument to “freshen” the edge of the hole which triggers the body's own natural healing process.

What is a Scutum in anatomy?

The scutum (plural: scuta) is a sharp bony spur that is formed by the superior wall of the external auditory canal and the lateral wall of the tympanic cavity. It forms the lateral margin of Prussak space.

Can an ear infection cause a cyst?

Repeated infections and/or and a tear or retraction of the eardrum can cause the skin to toughen and form an expanding sac. Cholesteatomas often devolop as cysts or pouches that shed layers of old skin, which build up inside the middle ear.

What is bilateral Tympanosclerosis?

Tympanosclerosis is the medical term for scarring of the ear drum. Scarring occurs after the ear drum is injured or after surgery. Commonly a small white area can be seen after a person has had middle ear ventilation tubes.

What is cochlear promontory?

The cochlear promontory is the name given to the bone that overlies the basal turn of the cochlea protruding into the middle ear cavity.

Is the auditory tube the same as eustachian tube?

The eustachian tube extends from the middle ear to the upper part of the throat behind the nose. Also known as the auditory tube, it helps keep the middle ear healthy by equalizing pressure, clearing secretions, and protecting it from pathogens that might otherwise cause infections.

What is Jacobson nerve?

Jacobson's nerve is a tympanic branch of the glossopharyngeal nerve, arising from its inferior ganglion. It enters the middle ear cavity through the inferior tympanic canaliculus, runs in a canal on the cochlear promontory and provides the main sensory innervation to the mucosa of the mesotympanum and Eustachian tube.

Can mastoiditis be cured?

Mastoiditis can be cured if treated with antibiotics right away. It may come back periodically (recur) in some individuals. If infection spreads, serious complication can arise including hearing loss, bone infection, blood clots, brain abscess, and meningitis.

What bone is the middle ear found in?

The middle ear contains three tiny bones: Hammer (malleus) — attached to the eardrum. Anvil (incus) — in the middle of the chain of bones. Stirrup (stapes) — attached to the membrane-covered opening that connects the middle ear with the inner ear (oval window)

What is Suprameatal triangle?

The suprameatal triangle (Macewen, mastoid fossa) is an area between the posterior wall of the external acoustic meatus and the posterior root of the zygomatic process. In this area, an instrument may be pushed into the tympanic antrum.

How is otitis media prevented?

How to prevent acute otitis media

1. wash hands and toys frequently to reduce your chances of getting a cold or other respiratory infection.
2. avoid cigarette smoke.
3. get seasonal flu shots and pneumococcal vaccines.
4. breastfeed infants instead of bottle feeding them if possible.
5. avoid giving your infant a pacifier.

How serious is otitis media?

Serious complications of middle ear infections (otitis media) are very rare but very young children are still at risk because their immune systems are still developing. Some of the main complications associated with middle ear infections are detailed below.

How is otitis media transmitted?

AOM is transmitted by airborne spread of the causative infectious agents in droplets, sprayed into the air when a sick person coughs or sneezes. The infection in the new host usually begins with a common cold, sore throat or measles.