Crista ampullaris

Crista ampullaris

Semicircular canal: ampulla at medium magnification with a hemotoxylin & eosin stain

The crista ampullaris is the sensory organ of rotation located in the semicircular canal of the inner ear. The function of the crista ampullaris is to sense angular acceleration and deceleration.

Background

The inner ear comprises two specialized regions of the membranous labyrinth: the saccule and the utricle.

• The saccule gives rise to the cochlear duct, which is involved in the special sense hearing.
• The utricle gives rise to the semicircular canals, which is involved in "equilibrium/balance".

The Semicircular canals are filled with perilymph, and also contain an inner membranous sleeve that form semicircular ducts. The semicircular ducts are filled with endolymph, and contain the crista ampullaris. The receptor cells located in the semicircular ducts are innervated by the eighth cranial nerve, aka vestibulocochlear nerve (more specifically the vestibular portion).

The crista ampullaris itself is a cone-shaped structure, covered in receptor cells called "hair cells". Covering the crista ampullaris is a gelatinous mass called the cupula. Upon angular acceleration (rotation), the endolymph within the semicircular duct deflects the cupula against the hair cells of the crista ampullaris. The hair cells respond by stimulating neurons that innervate them.

External links

• http://faculty.une.edu/com/abell/histo/CristaAmp.jpg
• http://www.kumc.edu/instruction/medicine/anatomy/histoweb/eye_ear/ear04.htm
• http://www.anatomyatlases.org/MicroscopicAnatomy/Section16/Plate16314.shtml
• http://www.med.uiuc.edu/histo/small/atlas/objects/1296.htm
• http://education.vetmed.vt.edu/Curriculum/VM8054/Labs/Lab11/Ear/EXAMPLES/Excrista.htm

This anatomy article is a stub. You can help Wikipedia by expanding it.v · Categories: Anatomy stubs Auditory system Wikimedia Foundation. 2010. Игры ⚽ Нужно сделать НИР? Inferior hypophysial artery Crystal Cave (Sequoia National Park) Look at other dictionaries: crista ampullaris — crista am·pul·lar·is .am p(y)ü lar əs n CRISTA (1) * * * [TA] ampullary crest: the most prominent part of a localized thickening of the membrane that lines the ampullae of the semicircular ducts, covered with neuroepithelium containing endings of …   Medical dictionary Crista ampullaris — ampulinė skiauterė statusas T sritis histologija, ląstelių chemija, histologinė chemija, audinių kultūra atitikmenys: lot. Crista ampullaris ryšiai: platesnis terminas – plėvinė ampulė …   Veterinarinės anatomijos, histologijos ir embriologijos terminai Crista ampullaris — ampulės skiauterė statusas T sritis gyvūnų anatomija, gyvūnų morfologija atitikmenys: lot. Crista ampullaris ryšiai: platesnis terminas – plėvinis labirintas …   Veterinarinės anatomijos, histologijos ir embriologijos terminai Crista ampullaris — ampulinė skiauterė statusas T sritis histologija atitikmenys: lot. Crista ampullaris ryšiai: platesnis terminas – plėvinė ampulė …   Medicininės histologijos ir embriologijos vardynas Crista ampullaris anterior — priekinės ampulės skiauterė statusas T sritis jutimo organai atitikmenys: lot. Crista ampullaris anterior ryšiai: platesnis terminas – pusratiniai kanalai …   Paukščių anatomijos terminai Crista ampullaris lateralis — šoninės ampulės skiauterė statusas T sritis jutimo organai atitikmenys: lot. Crista ampullaris lateralis ryšiai: platesnis terminas – pusratiniai kanalai …   Paukščių anatomijos terminai Crista ampullaris posterior — užpakalinės ampulės skiauterė statusas T sritis jutimo organai atitikmenys: lot. Crista ampullaris posterior ryšiai: platesnis terminas – pusratiniai kanalai …   Paukščių anatomijos terminai crista ampullaris — a ridge at the bottom of the ampullae, the widening in the base of the semicircular canalss of the inner ear. This ridge bears sensory epithelia …   Dictionary of ichthyology Crista — (lat. für „Leiste“, „Kamm“; Plural Cristae) ist in der Anatomie eine leistenförmige Struktur. Entsprechend der anatomischen Nomenklatur werden unterschieden: Crista ampullaris in der Bogengangampulle des Vestibularapparates, Absatz für das… …   Deutsch Wikipedia Crista (disambiguation) — Crista, Crest in Latin, may refer to: Crista, an internal compartment formed by the inner membrane of a mitochondrion Crista ampullaris, a sensory organ of the internal ear Crista dividends, a structure in the developing heart of the human embryo …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”