瞳孔括約筋
WordNet
- a ring of muscle that contracts to close an opening (同)anatomical sphincter, sphincter_muscle
- of or relating to the pupil of the eye
PrepTutorEJDIC
- 括約筋(かつやくきん)
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/08/02 00:40:37」(JST)
[Wiki en表示]
| Iris sphincter muscle |
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Iris, front view. (Muscle visible but not labeled.)
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The upper half of a sagittal section through the front of the eyeball. ("Sphincter of pupil" labeled near bottom-center.)
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| Details |
| Origin |
encircles iris[1] |
| Insertion |
encircles iris[1] |
| Artery |
long posterior ciliary arteries |
| Nerve |
short ciliary nerves |
| Actions |
constricts pupil |
| Antagonist |
iris dilator muscle |
| Identifiers |
| Latin |
Musculus sphincter pupillae |
Dorlands
/Elsevier |
m_22/12550831 |
| TA |
A15.2.03.029 |
| FMA |
49157 |
| Anatomical terms of muscle
[edit on Wikidata]
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The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil.
Contents
- 1 Comparative Anatomy
- 2 General Structure
- 3 Mode of Action
- 4 Innervation
- 5 See also
- 6 References
- 7 External links
Comparative Anatomy
It is found in vertebrates and some cephalopods.[citation needed]
General Structure
Initially, all the myocytes are of the smooth muscle type but, later in life, most cells are of the striated muscle type.[2]
Its dimensions are about 0.75 mm wide by 0.15 mm thick.[citation needed]
Mode of Action
In humans, it functions to constrict the pupil in bright light (pupillary light reflex) or during accommodation.[citation needed]
Innervation
It is controlled by parasympathetic fibers that originate from the Edinger-Westphal nucleus, travel along the oculomotor nerve (CN III), synapse in the ciliary ganglion, and then enter the eye via the short ciliary nerves.[citation needed]. The short ciliary nerves then run forward and pierce the sclera at the back of the eye, traveling between the sclera and the choroid to innervate the iris sphincter muscle.
See also
References
- ^ a b Gest, Thomas R; Burkel, William E. "Anatomy Tables - Eye." Medical Gross Anatomy. 2000. University of Michigan Medical School. 5 Jan. 2010 <http://anatomy.med.umich.edu/nervous_system/eye_tables.html>.
- ^ Pilar, G; Nuñez, R; McLennan, I. S.; Meriney, S. D. (1987). "Muscarinic and nicotinic synaptic activation of the developing chicken iris". The Journal of Neuroscience 7 (12): 3813–26. PMID 2826718.
External links
- Overview of function at tedmontgomery.com
- Slide at mscd.edu
- Histology image: 08010loa – Histology Learning System at Boston University
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Anatomy of the globe of the eye
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| Fibrous tunic (outer) |
| Sclera |
- Episcleral layer
- Schlemm's canal
- Trabecular meshwork
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| Cornea |
- Limbus
- layers
- Epithelium
- Bowman's
- Stroma
- Dua's layer
- Descemet's
- Endothelium
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| Uvea/vascular tunic (middle) |
| Choroid |
- Capillary lamina of choroid
- Bruch's membrane
- Sattler's layer
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| Ciliary body |
- Ciliary processes
- Ciliary muscle
- Pars plicata
- Pars plana
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| Iris |
- Stroma
- Pupil
- Iris dilator muscle
- Iris sphincter muscle
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| Retina (inner) |
| Layers |
- Inner limiting membrane
- Nerve fiber layer
- Ganglion cell layer
- Inner plexiform layer
- Inner nuclear layer
- Outer plexiform layer
- Outer nuclear layer
- External limiting membrane
- Layer of rods and cones
- Retinal pigment epithelium
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| Cells |
- Photoreceptor cells (Cone cell, Rod cell) → (Horizontal cell) → Bipolar cell → (Amacrine cell) → Retina ganglion cell (Midget cell, Parasol cell, Bistratified cell, Giant retina ganglion cells, Photosensitive ganglion cell) → Diencephalon: P cell, M cell, K cell, Muller glia
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| Other |
- Macula
- Foveola
- Fovea centralis
- Parafovea
- Perifovea
- Optic disc
- Ora serrata
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| Anatomical regions of the eye |
| Anterior segment |
- Adnexa
- Fibrous tunic
- Anterior chamber
- Aqueous humor
- Iris
- Posterior chamber
- Ciliary body
- Lens
- Capsule of lens
- Zonule of Zinn
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| Posterior segment |
- Vitreous chamber
- Retina
- Choroid
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| Other |
- Keratocytes
- Ocular immune system
- Tapetum lucidum
- Eye care professional
- Eye disease
- Refractive error
- Accommodation
- Physiological Optics
- Visual perception
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Optical illusions
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List of optical illusions
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- Afterimage
- Barberpole
- Bezold
- Blivet
- Café wall
- Cornsweet
- Delboeuf
- Ebbinghaus
- Ehrenstein
- Flash lag
- Fraser spiral
- Grid
- Hering
- Jastrow
- Mach
- McCollough
- Müller-Lyer
- Necker
- Orbison
- Penrose
- Peripheral drift
- Poggendorff
- Ponzo
- Rubin
- Sander
- Schroeder
- Ternus
- Vertical–horizontal
- White's
- Wundt
- Zöllner
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| Related |
- Auditory
- Tactile
- Temporal
- Op art
- Ascending and Descending
- Waterfall
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UpToDate Contents
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English Journal
- A Rare Case of Pupillary Block Glaucoma Following CentraFLOW Implantable Collamer Lens Surgery.
- Grover IG1, Senthil S, Murthy S, Reddy JC.
- Journal of glaucoma.J Glaucoma.2017 Aug;26(8):694-696. doi: 10.1097/IJG.0000000000000705.
- PMID 28650856
- Regulator of G-protein signaling Gβ5-R7 is a crucial activator of muscarinic M3 receptor-stimulated insulin secretion.
- Wang Q1, Pronin AN1, Levay K1, Almaca J2, Fornoni A2, Caicedo A2, Slepak VZ3.
- FASEB journal : official publication of the Federation of American Societies for Experimental Biology.FASEB J.2017 Jul 7. pii: fj.201700197RR. doi: 10.1096/fj.201700197RR. [Epub ahead of print]
- PMID 28687610
- Synergistic Signaling by Light and Acetylcholine in Mouse Iris Sphincter Muscle.
- Wang Q1, Yue WWS2, Jiang Z3, Xue T4, Kang SH5, Bergles DE5, Mikoshiba K6, Offermanns S7, Yau KW8.
- Current biology : CB.Curr Biol.2017 Jun 19;27(12):1791-1800.e5. doi: 10.1016/j.cub.2017.05.022. Epub 2017 Jun 1.
- PMID 28578927
Japanese Journal
- Clinicoradiological Analysis of the Oculomotor Fasciculus
- A Case of Inferolateral Oculomotor Fascicular Infarction: A Review of the Clinicoradiological Literature
- Mydriasis Associated with Local Dysfunction of Parasympathetic Nerves in Two Dogs
Related Links
- The iris sphincter muscle (pupillary sphincter, pupillary constrictor, circular muscle of iris, circular fibers) is a muscle in the part of the eye called the iris. It encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil.
★リンクテーブル★
[★]
- 英
- pupillary sphincter, sphincter pupillae muscle
- ラ
- musculus sphincter pupillae
- 同
- 縮瞳筋
- 関
- 動眼神経、副交感神経、交感神経、瞳孔散大筋、虹彩、対光反射。眼
[★]
瞳孔括約筋
- 関
- pupillary sphincter
[★]
括約筋
- 関
- sphincter muscle、sphincteral
[★]
- 関
- pupil