- "Vestibulum" and "vestibule" redirect here. For other uses, see Vestibule (disambiguation).
| Vestibule of the ear | |
|---|---|
 |
|
| Chain of ossicles and their ligaments, seen from the front in a vertical, transverse section of the tympanum. (Vestibule visible at center right. ) | |
| Latin | vestibulum auris |
| Gray's | subject #232 1047 |
| Dorlands/Elsevier | v_08/12856151 |
Contents |
Definition
The vestibule is the central part of the osseous labyrinth, and is situated medial to the tympanic cavity, behind the cochlea, and in front of the semicircular canals. The posterior semicircular canal is a part of the Vestibular system and detects rotations of the head in the Sagittal plane The superior semicircular canal ( anterior semicircular canal) is a part of the Vestibular system and detects rotation of the head around a rostral-caudal (anterior-posterior The utricle, or utriculus along with the Saccule is one of the two Otolith organs located in the Vertebrate Inner ear. The lateral or horizontal canal (external semicircular canal is the shortest of the three canals The cochlea is the auditory portion of the Inner ear. Its core component is the Organ of Corti, the sensory organ of hearing, which is distributed along Introduction The saccule is a bed of sensory cells situated in the inner ear Latin ( lingua Latīna, laˈtiːna is an Italic language, historically spoken in Latium and Ancient Rome. the Peripheral organs of the Special senses the organs of Taste ( Peripheral gustatory or Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group The bony labyrinth ( osseous labyrinth) located in the Inner Ear consists of three parts vestibule Semicircular canals
Anatomical characteristics
It is somewhat ovoid in shape, but flattened transversely; it measures about 5 mm. from before backward, the same from above downward, and about 3 mm. across.
In its lateral or tympanic wall is the fenestra vestibuli, closed, in the fresh state, by the base of the stapes and annular ligament. The oval window (or vestibular window) is a membrane-covered opening which leads from the Middle ear to the vestibule of the inner Ear. The stapes or stirrup is the stirrup-shaped small Bone or ossicle in the Middle ear which attaches the Incus to the Fenestra ovalis The Annular stapedial ligament is a ring of fibrous tissue that connects the base of the Stapes to the Oval window of the Inner ear.
On its medial wall, at the forepart, is a small circular depression, the recessus sphæricus, which is perforated, at its anterior and inferior part, by several minute holes (macula cribrosa media) for the passage of filaments of the acoustic nerve to the saccule; and behind this depression is an oblique ridge, the crista vestibuli, the anterior end of which is named the pyramid of the vestibule. The vestibulocochlear nerve (also known as the auditory or acoustic nerve) is the eighth of twelve Cranial nerves, and is responsible for transmitting sound
This ridge bifurcates below to enclose a small depression, the fossa cochlearis, which is perforated by a number of holes for the passage of filaments of the acoustic nerve which supply the vestibular end of the ductus cochlearis.
As the hinder part of the medial wall is the orifice of the aquæductus vestibuli, which extends to the posterior surface of the petrous portion of the temporal bone. The temporal bones are situated at the sides and base of the Skull.
It transmits a small vein, and contains a tubular prolongation of the membranous labyrinth, the ductus endolymphaticus, which ends in a cul-de-sac between the layers of the dura mater within the cranial cavity. From the posterior wall of the Saccule a canal the endolymphatic duct, is given off this duct is joined by the Ductus utriculosaccularis, and then passes along the
On the upper wall or roof is a transversely oval depression, the recessus ellipticus, separated from the recessus sphæricus by the crista vestibuli already mentioned.
The pyramid and adjoining part of the recessus ellipticus are perforated by a number of holes (macula cribosa superior).
The apertures in the pyramid transmit the nerves to the utricle; those in the recessus ellipticus are the nerves to the ampullæ of the superior and lateral semicircular ducts.
Behind, the five orifices of the semicircular canals can be found.
There is, in the frontal view, an elliptical opening, which communicates with the scala vestibuli of the cochlea.
Additional images
 Right osseous labyrinth (lateral view). |
 The cochlea and vestibule (view from above). |
External links
See also
This article was originally based on an entry from a public domain edition of Gray's Anatomy. eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely two medical doctors The inner Ear is the bony labyrinth, a system of passages comprising two main functional parts the organ of hearing or Cochlea The public domain is a range of abstract materials &ndash commonly referred to as Intellectual property &ndash which are not owned or controlled by anyone Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened is an English-language Human anatomy Textbook As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic