Schlemm's canal


Schlemm's canal

Infobox Anatomy
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Caption = Enlarged general view of the iridial angle. (Labeled with older label of 'sinus venosus scleræ' at center top.)



Caption2 = The upper half of a sagittal section through the front of the eyeball. (Canal of Schlemm labeled at center left.)
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Schlemm's canal, also known as canal of Schlemm or the scleral venous sinus, is a circular channel in the eye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream. [Cassin, B. and Solomon, S. "Dictionary of Eye Terminology". Gainsville, Florida: Triad Publishing Company, 1990.]

The canal is essentially an endothelium-lined tube, resembling that of a lymphatic vessel. On the inside of the canal, nearest to the aqueous humor, it is covered by the trabecular meshwork, this region makes the greatest contribution to outflow resistance of the aqueous humor.

Named after Friedrich Schlemm (1795-1858), a German anatomist.

Role in glaucoma

The canal transfers approximately 2-3 microliters of aqueous humor per minute. [Johnson MC, Kamm RD. [http://www.iovs.org/cgi/reprint/24/3/320.pdf "The role of Schlemm's canal in aqueous outflow from the human eye."] "Invest Ophthalmol Vis Sci." 1983 Mar;24(3):320-5. PMID 6832907.] If debris builds up, due to infection or injury in the aqueous humor, the canal is blocked and glaucoma is the result.

Canaloplasty

Canaloplasty is an advanced, nonpenetrating procedure designed to enhance and restore the eye’s natural drainage system to provide sustained reduction of intraocular pressure. Canaloplasty utilizes microcatheters in a simple and minimally invasive procedure. To perform a canaloplasty, a surgeon will create a tiny incision to gain access to Schlemm's canal. A microcatheter circumnavigates Schlemm's canal around the iris, enlarging the main drainage channel and its smaller collector channels through the injection of a sterile, gel-like material called viscoelastic. The catheter is then removed and a suture is placed within the canal and tightened. By opening Shlemm's canal, the pressure inside the eye is relieved. [https://mediamillinc.com/vjo.php?display=video&id=013] [http://www.jcrsjournal.org/article/S0886-3350(08)00004-7/abstract,] [http://www.jcrsjournal.org/article/S0886-3350(07)00697-9/abstract]

ee also

*Intraocular pressure
*Ocular hypertension

References

External links

*
* [http://www.glaucoma-association.com/media/images/medical/diagrams/labelled/english/Conventional_Outflow_Diag_L.jpgDiagram]
* [http://www.uveitis.org/images/Aqueous_flow.jpgDiagram]


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Look at other dictionaries:

  • Schlemm's canal — shlemz n CANAL OF SCHLEMM * * * a channel in the eye, at the junction of the cornea and the sclera, through which the aqueous humour drains. F. Schlemm (1795 1858), German anatomist …   Medical dictionary

  • Schlemm's canal — noun a circular canal in the eye that drains aqueous humor from the anterior chamber of the eye into the anterior ciliary veins • Syn: ↑canal of Schlemm, ↑sinus venosus sclerae • Hypernyms: ↑duct, ↑epithelial duct, ↑canal, ↑channel * * * …   Useful english dictionary

  • Schlemm's canal — a channel in the eye, at the junction of the cornea and the sclera, through which the aqueous humour drains [Schlemm (1795–1858), German anatomist] …   The new mediacal dictionary

  • Канал Шлеммов (Schlemm 'S Canal) — венозный синус склеры, проходящий в толще склеры в месте ее соединения с роговицей; через этот канал обеспечивается отток внутриглазной жидкости из передней камеры глаза. Источник: Медицинский словарь …   Медицинские термины

  • canal of Schlemm — shlem n a circular canal lying in the substance of the sclerocorneal junction of the eye and draining the aqueous humor from the anterior chamber into the veins draining the eyeball called also Schlemm s canal, sinus venosus sclerae Schlemm… …   Medical dictionary

  • canal of Schlemm — noun a circular canal in the eye that drains aqueous humor from the anterior chamber of the eye into the anterior ciliary veins • Syn: ↑Schlemm s canal, ↑sinus venosus sclerae • Hypernyms: ↑duct, ↑epithelial duct, ↑canal, ↑channel * * * …   Useful english dictionary

  • canal de Schlemm — Eng. Schlemm s canal Canal circular situado en la unión de la esclerótica y la córnea, entre el septo esclerar y el espolón escleral y cubierto por la trabécula esclerocorneal. Conducto de Schlemm. Conducto de Sauth. Seno venoso de la esclerótica …   Diccionario de oftalmología

  • Canal de Schlemm — Pour les articles homonymes, voir Schlemm. Le canal de Schlemm est une veine annulaire située dans l œil, près du bord antérieur de la sclérotique dans l angle irido cornéen. Elle permet le drainage de l humeur aqueuse. Son blocage provoque le… …   Wikipédia en Français

  • Canal de Schlemm — Saltar a navegación, búsqueda El Canal de Schlemm es un pequeño canal circunferencial localizado en el ángulo iridocorneal de la cámara anterior del ojo por el cual drena el humor acuoso hacia la circulación sanguínea.[1] Tiene un importante… …   Wikipedia Español

  • canal — A duct or channel; a tubular structure. SEE ALSO: c., duct. SYN: canalis [TA]. [L. canalis] abdominal c. SYN: inguinal c.. accessory c. a channel leading from the root …   Medical dictionary


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