Crista ampullaris: Difference between revisions

Crista ampullaris
Crista ampullaris
	Semicircular canal: ampulla at medium magnification with a hemotoxylin & eosin stain
Details
Location	Semicircular canals of inner ear
Function	Supply sensation of rotation
Identifiers
TA98	A15.3.03.088
TA2	7012, 7015, 7020
FMA	77714
	Anatomical terminology [edit on Wikidata]

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Latest revision as of 00:37, 29 December 2023

The crista ampullaris is the sensory organ of rotation. They are found in the ampullae of each of the semicircular canals of the inner ear, meaning that there are three pairs in total. The function of the crista ampullaris is to sense angular acceleration and deceleration.

Background

The inner ear comprises three specialized regions of the membranous labyrinth: the vestibular sacs – the utricle and saccule, and the semicircular canals, which are the vestibular organs, as well as the cochlear duct, which is involved in the special sense of hearing.

The semicircular canals are filled with endolymph due to its connection with the cochlear duct via the saccule, which also contains endolymph. It also contains an inner membranous sleeve that lines the semicircular canals. The canals also contain the crista ampullaris. The receptor cells located in the semicircular ducts are innervated by the eighth cranial nerve, the vestibulocochlear nerve (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 thus respond by stimulating neurons that innervate them.

References

Ovalle, William (2008). Netter's Essential Histology. Philadelphia, PA USA: Saunders Elsevier. p. 448. ISBN 978-1-929007-86-8.

External links

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+{{Short description|Sensory organ in the inner ear}}
-{{db-nocontext}}
+{{No footnotes|date=July 2015}}
-'''Main Point'''
+{{Infobox anatomy
-The Crista Ampullaris is a part of the inner ear, specifically it can be found in the semicircular canal. The function of the cristae ampularis is to sense angular acceleration and deceleration.
+| Name        = Crista ampullaris
+| Latin       =
+| Image       = Semicircular canal - ampulla.png
+| Caption     = Semicircular canal: ampulla at medium magnification with a hemotoxylin & eosin stain
+| Location    = [[Semicircular canals]] of [[inner ear]]
+| Image2      =
+| Caption2    =
+| Precursor   =
+| System      =
+| Artery      =
+| Vein        =
+| Nerve       =
+| Lymph       =
+| Function    = Supply sensation of rotation
+}}
+The '''crista ampullaris''' is the sensory organ of rotation. They are found in the [[osseous ampullae|ampullae]] of each of the [[semicircular canals]] of the [[inner ear]], meaning that there are three pairs in total. The function of the crista ampullaris is to sense angular acceleration and deceleration.
-'''Background'''
-The inner ear is comprised of 2 specialized regions of the membranous labyrinth: the saccule and the utricle. The saccule gives rise to the cholear duct, which is involved in the special sense "Hearing". The utricle gives rise to the semicircular canals, which is involved in "equilibrium/balance."  The receptor cells located in the semicircular canal are innervated by cranial nerve 8 aka vestibulocochlear nerve (more specifically the vestibule portion).
+==Background==
-This information was obtained via a histology medical school lecture in 2006, and is provided by [http://www.sharenotesstore.com ShareNotes] [http://www.sharenotesstore.com College Lecture Notes]
+The inner ear comprises three specialized regions of the [[membranous labyrinth]]: the vestibular sacs – the [[utricle (ear)|utricle]] and [[saccule]], and the [[semicircular canals]], which are the [[vestibular organs]], as well as the [[cochlear duct]], which is involved in the [[special sense]] of [[Hearing (sense)|hearing]].
+The semicircular canals are filled with [[endolymph]] due to its connection with the cochlear duct via the saccule, which also contains endolymph. It also contains an inner membranous sleeve that lines the semicircular canals. The canals also contain the crista ampullaris. The [[hair cell|receptor cells]] located in the semicircular ducts are innervated by the eighth cranial nerve, the [[vestibulocochlear nerve]] (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 [[Ampullary cupula|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 thus respond by stimulating neurons that innervate them.
+== References ==
+{{cite book|last=Ovalle|first=William|title=Netter's Essential Histology|year=2008|publisher=Saunders Elsevier|location=Philadelphia, PA USA|isbn=978-1-929007-86-8|pages=448}}
+==External links==
+* http://faculty.une.edu/com/abell/histo/CristaAmp.jpg {{Webarchive|url=https://web.archive.org/web/20070928110855/http://faculty.une.edu/com/abell/histo/CristaAmp.jpg |date=2007-09-28 }}
+* http://www.kumc.edu/instruction/medicine/anatomy/histoweb/eye_ear/ear04.htm {{Webarchive|url=https://web.archive.org/web/20070607013717/http://www.kumc.edu/instruction/medicine/anatomy/histoweb/eye_ear/ear04.htm |date=2007-06-07 }}
+* http://www.anatomyatlases.org/MicroscopicAnatomy/Section16/Plate16314.shtml
+* http://www.med.uiuc.edu/histo/small/atlas/objects/1296.htm
+* https://web.archive.org/web/20070703152544/http://education.vetmed.vt.edu/curriculum/VM8054/Labs/Lab11/Ear/EXAMPLES/Excrista.htm
+{{Auditory and vestibular systems}}
+{{Authority control}}
+[[Category:Auditory system]]