Tympanic cavity

tegmen tympanilateral wallanterioranterior wallanterior wall of the tympanic cavitycavum tympaniLabyrinthine wall of tympanic cavitymastoidMastoid wall of tympanic cavitymedial wall
The tympanic cavity is a small cavity surrounding the bones of the middle ear.wikipedia
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Middle ear

middlemiddle-earmiddle ear bones
The tympanic cavity is a small cavity surrounding the bones of the middle ear.
The hollow space of the middle ear is also known as the tympanic cavity and is surrounded by the tympani bone.

Promontory of tympanic cavity

promontory
The promontory of the tympanic cavity, also known as the cochlear promontory is a rounded hollow prominence, formed by the projection outward of the first turn of the cochlea.

Petrotympanic fissure

Glaserian fissure
The petrotympanic fissure (also known as the squamotympanic fissure or the glaserian fissure) is a fissure in the temporal bone that runs from the temporomandibular joint to the tympanic cavity.

Eardrum

tympanic membraneear drumtympanum
On its lateral surface, it abuts the external auditory meatus [ ear canal ] from which it is separated by the tympanic membrane (eardrum).
The manubrium (handle) of the malleus is firmly attached to the medial surface of the membrane as far as its center, drawing it toward the tympanic cavity.

Prominence of facial canal

Prominence of the facial canal
The prominence of the facial canal (prominence of aqueduct of Fallopius) indicates the position of the bony facial canal in which the facial nerve is contained; this canal traverses the medial wall of the tympanic cavity above the oval window, and behind this it curves nearly vertically downward along the posterior wall.

Tympanic nerve

tympanic branchtympanic
It arises from the inferior ganglion of the glossopharyngeal nerve, and ascends to the tympanic cavity through a small canal, the inferior tympanic canaliculus, on the under surface of the petrous portion of the temporal bone on the ridge which separates the carotid canal from the jugular fossa.

Ligaments of malleus

anterior ligament of malleusanterior ligament of the malleuslateral malleal ligament
The anterior ligament of the malleus also known as Casserio's ligament is a fibrous band that extends from the neck of the malleus just above its anterior process to the anterior wall of the tympanic cavity close to the petrotympanic fissure.

Eustachian tube

auditory tubeEustachian tubespharyngotympanic tube
It begins in the anterior wall of the tympanic cavity, below the septum canalis musculotubarii, and, gradually narrowing, ends at the angle of junction of the squamous and the petrous parts of the temporal bone, its extremity presenting a jagged margin which serves for the attachment of the cartilaginous part.

Tensor tympani muscle

tensor tympanitympanicTympanic muscle
The tensor tympani is the larger of the two muscles of the tympanic cavity, the other being the stapedius.

Incus

incus (anvil)anvilAnvil (bone)
The superior ligament of the incus attaches at the body of the incus to the roof of the tympanic cavity.

Aditus to mastoid antrum

aditus ad antrumentrance to the tympanic antrum
The antrum communicates behind and below with the mastoid air cells, which vary considerably in number, size, and form; the antrum and mastoid air cells are lined by mucous membrane, continuous with that lining the tympanic cavity.

Squamous part of temporal bone

squamasquama temporalissquamous
The petrotympanic fissure leads into the middle ear or tympanic cavity; it lodges the anterior process of the malleus, and transmits the tympanic branch of the internal maxillary artery.

Stylomastoid artery

stylomastoid branch
The stylomastoid artery enters the stylomastoid foramen and supplies the tympanic cavity, the tympanic antrum and mastoid cells, and the semicircular canals.

Mastoid antrum

tympanic antrum
The roof is formed by the tegmen antri which is a continuation of the tegmen tympani and separates it from the middle cranial fossa.

Internal carotid artery

internal carotid arteriesinternal carotidinternal
The artery lies at first in front of the cochlea and tympanic cavity; from the latter cavity it is separated by a thin, bony lamella, which is cribriform in the young subject, and often partly absorbed in old age.

Ossicles

ossicleear ossiclesauditory ossicles
The tympanic cavity is a small cavity surrounding the bones of the middle ear.

Sound

audiosound wavesound waves
Within it sit the ossicles, three small bones that transmit vibrations used in the detection of sound.

Ear canal

external auditory meatusexternal acoustic meatusexternal auditory canal
On its lateral surface, it abuts the external auditory meatus [ ear canal ] from which it is separated by the tympanic membrane (eardrum).

Oval window

fenestra ovalisfenestra vestibulifenestra vestibuli (oval window)

Sternum

manubriumbreastbonesternal