| Utricle (ear) | |
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| illustration of otolith organs showing detail of utricle, otoconia, endolymph, cupula, macula, hair cell filaments, and saccular nerve | |
| Components of the inner ear including the utricle | |
| Latin | utriculus |
| Gray's | subject #232 1051 |
| MeSH | Saccule+and+Utricle |
| Dorlands/Elsevier | u_04/12841370 |
The utricle, or utriculus, along with the saccule is one of the two otolith organs located in the vertebrate inner ear. An otolith, (οτο- oto-, ear + λιθος lithos, a stone also called statoconium or otoconium is a structure in the Saccule Endolymph is the fluid contained in the Membranous labyrinth of the Inner ear. The cupula is a structure in the Vestibular system, sensing Proprioception. The macula or macula lutea (from Latin macula, "spot" + lutea, "yellow" is an oval Yellow spot near the center Hair cells are the Sensory receptors of both the Auditory system and the Vestibular system in all Vertebrates. The saccular nerve is a nerve which supplies the Macula of the Saccule. 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 lateral or horizontal canal (external semicircular canal is the shortest of the three canals "Vestibulum" and "vestibule" redirect here For other uses see Vestibule (disambiguation. 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 Medical Subject Headings ( MeSH) is a huge Controlled vocabulary (or metadata system for the purpose of indexing journal articles and books Elsevier, the world's largest Publisher of Medical and Scientific literature, forms part of the Reed Elsevier group Introduction The saccule is a bed of sensory cells situated in the inner ear An otolith, (οτο- oto-, ear + λιθος lithos, a stone also called statoconium or otoconium is a structure in the Saccule Vertebrates are members of the Subphylum Vertebrata, Chordates with backbones or spinal columns The grouping sometimes includes The inner Ear is the bony labyrinth, a system of passages comprising two main functional parts the organ of hearing or Cochlea
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Anatomy
The utricle is larger than a grain of sand and the saccule and is of an oblong form, compressed transversely, and occupies the upper and back part of the vestibule, lying in contact with the recessus ellipticus and the part below it. "Vestibulum" and "vestibule" redirect here For other uses see Vestibule (disambiguation.
The utricle contains mechanoreceptors called hair cells that distinguish between degrees of tilting of the head, thanks to their apical cilia set-up. These are covered by otolith and, once you tilt your head, otolith viscosity has the cilia tilt as well. An otolith, (οτο- oto-, ear + λιθος lithos, a stone also called statoconium or otoconium is a structure in the Saccule Depending on whether the tilt is in the direction of the kinocilium or not, the resulting hair cell polarisation is excitatory (depolarising) or inhibitory (hyperpolarisation), respectively. A kinocilium is a special structure on the apex of Hair cells located in the sensory epithelium of the vertebrate Inner ear. This signal to the vestibular nerve (which takes it to the brainstem) does not adapt with time, so if you're lying in bed, you still feel as if you're lying in bed 9 hours afterwards when you wake up.
That portion which is lodged in the recess forms a sort of pouch or cul-de-sac, the floor and anterior wall of which are thickened, and form the macula acustica utriculi, which receives the utricular filaments of the acoustic nerve. The vestibulocochlear nerve (also known as the auditory or acoustic nerve) is the eighth of twelve Cranial nerves, and is responsible for transmitting sound
The cavity of the utricle communicates behind with the semicircular ducts by five orifices. The semicircular canals are three half-circular interconnected tubes located inside each Ear that are the equivalent of three Gyroscopes located in three orthogonal
From its anterior wall is given off the ductus utriculosaccularis, which opens into the ductus endolymphaticus. 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
See also
Additional images
 Vestibular system |
 Transverse section through head of fetal sheep, in the region of the labyrinth. An otolith, (οτο- oto-, ear + λιθος lithos, a stone also called statoconium or otoconium is a structure in the Saccule X 30. |
 The membranous labyrinth. |
External links
This article was originally based on an entry from a public domain edition of Gray's Anatomy. 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.
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