What are the parts of the inner ear? The structure of the inner ear includes:

See the encyclopedia "The Ear".

The main structure of the ear can be divided into three main parts: the outer ear, the middle ear, and the inner ear.

Outer ear: The outer ear includes the pinna and the external auditory canal, which we usually talk about"Ears"In fact, it is only the part of the auricle, which has the effect of collecting sound. The external auditory canal is a channel for sound transmission, which is about long, hollow and curved inside, and the 1 3 of the auricle is composed of cartilage, and the inner 2 3 is composed of bone, and the surface is covered by **.

Middle ear: The middle ear consists of the tympanic chamber, tympanic sinus, mastoid process, and eustachian tube.

The eardrum is the eardrum that separates the outer ear from the middle ear and the outer wall of the tympanic chamber. The tympanic chamber is a cavity that contains the smallest bone in the human body, the ossicles. The three ossicles of the malleus, incus, and stapes, combine to form the ossicular chain, which connects to the eardrum at one end and the auditory tissue of the inner ear at the other.

As sound waves travel through the ear canal, the eardrum vibrates the eardrum, which then transmits the vibrations to the inner ear through the ossicular chain.

The tympanic sinus is a cavity located above the back of the tympanic cavity, and its anatomical position is very peculiar: it is adjacent to the tympanic cavity in front and mastoids in the posterior and inferior posteriorly, and there are many important sites around it, so it is often used here for otological surgeries.

The mastoid process is located behind the ear, and the protrusion behind the earlobe is its apex. The mastoid process is separated by thin bony plates in a honeycomb shape, called the mastoid air chamber, which protects the inner ear from the effects of external climate change.

The Eustachian tube connects the nasopharynx to the middle ear, and it regulates the balance between the middle ear and the outside air pressure, so that the middle ear is consistent with the air pressure of the external environment.

Inner ear: The inner ear is also known as the inner ear because of its complex structure"Get lost", consisting of the cochlea in the anterior, the vestibule in the middle, and the semicircular canal in the posterior.

The vibration of sound waves is transmitted to the inner ear, and the vibration of the eardrum can be transmitted through the ossicular chain to become the vibration of the vestibular window, causing the movement of the cochlear lymph fluid in the inner ear, so that the auditory hair cells are excited and the auditory sense is formed. The cochlea is responsible for processing sound signals.

The inner ear is divided into three parts: the semicircular canals, the vestibule, and the cochlea.

The ear is divided into the outer ear, the middle ear and the inner ear, of which the inner ear is composed of three parts: the semicircular canal, the vestibule, and the cochlea as shown below

Therefore, d

The structure of the inner ear is divided into two parts: the vestibule and the cochlea.

The vestibule can be divided into two parts: one is the symmetrical trinomical canal of the left and right ears, which mainly controls the rotational balance. The three semicircular canals are perpendicular to each other, and the three-dimensional space of Naixin can be described as comprehensive, so no matter what posture your body or head is, the three semicircular canals can be managed without any dead ends.

As a result, balance can be maintained in any pose. The other part is the utricle and globular sac, which control the balance of the rectilinear hall, including gravity.

The cochlea, located anteriorly medial below the vestibule, resembles a snail shell and consists of a bony spiral canal around its central bony axis (snail). The tip of the cochlea is called the cochlear crest and faces anteriorly laterally; The base of the cochlea is called the cochlear floor and faces the base of the inner auditory canal. The conical part between the top of the worm and the bottom of the worm is called the shaft of the worm and is made up of cancellous bone.

There is a cochlear nerve vascular passage in the cochlea shaft. From the top of the snail to the bottom of the snail from the snail axis to the outward side of a bone spiral plate, the free edge of the bone spiral plate is a sickle-like thin bone piece, forming a hole between the top of the snail and the snail axis, called the snail hole. The spiral plate protrudes into the spiral canal but does not reach the lateral wall of the canal, and the defect between them is the basis of the membranous cochlear attachment.

The structures that make up the inner ear are, in order, b).

a.Semicircular canals, ossicles, cochlea BSemicircular canals, vestibule, cochlear ctympanic membrane, ossicles, cochlea Dtympanic membrane, vestibule, cochlea

The inner ear, which includes the bony labyrinth and membranous labyrinth, is encapsulated in the bone of the petrous portion of the temporal bone, between the tympanic cavity and the floor of the inner auditory canal. The bony labyrinth is divided into three parts: vestibule, bony semicircular canal, and cochlea. In addition, the vestibulocochlear nerve passes through the inner auditory canal, so it is also attached to the description of the bony labyrinth.

Vestibule: The vestibule is an approximately oval-shaped cavity in the middle of the bony labyrinth. It communicates anteriorly and inferiorly to the cochlea; Posteriorly communicates three bony semicircular canals.

The lateral wall is part of the intratympanic wall and meets the base of the stapes at the vestibular window; The medial wall corresponds to the floor of the inner auditory canal. The medial wall of the vestibule is poorly burned with an oblique vestibular crest. The anterior and inferior crest is the utricle crypt and the anterior and inferior is the balloon crypt.

The eponymous sac that houses the membranous labyrinth, respectively. The underside of the crest is divided into smaller worm recesses that house the vestibular blind end of the cochle. There are several groups of small holes on the medial wall, called ethmoid plaques, which are channels for the vestibular nerve.

The inferior division of the utricle crypt also has an inner opening of the vestibular aqueduct, which is the place where the endolymphtic vessels lead to the vestibular aqueduct.

Bone semicircular canal: The bone semicircular canal includes three bone semicircular canals, anterior, lateral and posterior, all in a "C" shape, about 2 3 of the circumference. Each bony semicircular canal is connected to the vestibular by two bony feet.

One foot is called the ampullary bone foot, each of the three tubes has an enlarged bony ampullae, the other bone foot of the anterior and posterior bone semicircular canals is called the common bone foot, and the other bone foot of the outer bone semicircular canal is called the uniosculous foot.

Therefore, there are a total of five openings in the vestibule of the three semicircular canals. The three bony semicircular canals are perpendicular to each other in their spatial position. The anterior semicircular canal arch is upward, perpendicular to the long axis of the pyramid, and is buried deep in the bow-shaped bulge.

The horizontal arch of the lateral bony semicircular canal is posteriorly outward, forming a convex lateral canal at the entrance to the mastoid sinus; The posterior bone semicircular canal arch is posterior outward, approximately parallel to the long axis of the pyramid. The diameter of the bony semicircular canal is approximately doubled at the ampulla of the bone.

Cochlea: The cochlea resembles a volute, the base of the cochlea corresponds to the bottom of the inner auditory canal, and the tip is outward, called the cochlear roof. Running through the base and top is a conical cochlea axis composed of cancellous bones, with cochlear nerves and blood vessels running through it.

The cochlea consists of a spiral-shaped bony tube that curves around the worm axis 21 2 23 4 turns, called the spiral tube.

The base ring of the tube fits snugly against the medial wall of the middle ear and participates in the formation of the promontory; The top ring is finally blind end. The spiral plate protrudes from the cochlear axis into the spiral canal, incompletely separating the canal into the anterolateral vestibular and posteromedial tympanum steps.