Stroma of cornea
Information about Stroma of cornea
) | |
| Vertical section of human cornea from near the margin. (Waldeyer.) Magnified. 1. Epithelium. 2. Anterior elastic lamina. 3. substantia propria. 4. Posterior elastic lamina. 5. Endothelium of the anterior chamber. a. Oblique fibers in the anterior layer of the substantia propria. b. Lamellæ the fibers of which are cut across, producing a dotted appearance. c. Corneal corpuscles appearing fusiform in section. d. Lamellæ the fibers of which are cut longitudinally. e. Transition to the sclera, with more distinct fibrillation, and surmounted by a thicker epithelium. f. Small blood vessels cut across near the margin of the cornea. | |
| Latin | s. propria corneae |
| subject #225 1007 | |
| Dorlands/Elsevier | s_27/12766936 |
It is composed of about 200 flattened lamellæ (plates of collagen fibrils), superimposed one on another.[1] These fibrils run at different angles between the limbi. Fibres of the layers frequently interweave, the anterior lamellæ interweaving more than posterior lamellæ. The fibres of each lamella are parallel with one another, but at right angles to those of adjacent lamellæ. The lamellæ are produced by keratocytes, which occupy about 10% of the substantia propria.
These lamellæ are made up of bundles of modified connective tissue, the fibres of which are directly continuous with those of the sclera. More collagen fibres run in a temporal-nasal direction than run in the superior-inferior direction. This is often ignored by corneal transplant surgeons, leading to poor corneal mechanical strength in corneal transplant patients.
Keratoconus is a condition caused by disorganised lamellæ, leading to a bulbous cornea.
References
External links
Sensory system - Visual system - Eye | |
|---|---|
| Fibrous tunic (outer) | Conjunctiva • Sclera • Schlemm's canal • Trabecular meshwork • Limbus Cornea (Epithelium, Bowman's, Stroma, Descemet's, Endothelium) |
| Uvea (middle) | Choroid (Ciliary processes, Choriocapillaris, Bruch's membrane) • Iris (Stroma) • Pupil • Ciliary body |
| Retina (inner) | Macula • Fovea • Optic disc |
| Anterior segment | Anterior chamber • Aqueous humour • Posterior chamber • Lens |
| Posterior segment | Vitreous humour • Zonular fibers • Zonule of Zinn |
epithelium is a tissue composed of a layer of cells. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous, keratinized epithelial cells.
..... Click the link for more information.
..... Click the link for more information.
The Bowman's membrane (Bowman's layer, anterior limiting lamina, anterior elastic lamina) is a smooth layer in the eye. It is located between the front epithelium and the stroma in the cornea.
..... Click the link for more information.
..... Click the link for more information.
The substantia propria (or stroma of cornea) is fibrous, tough, unyielding, and perfectly transparent.
It is composed of about 200 flattened lamellæ (plates of collagen fibrils), superimposed one on another.
..... Click the link for more information.
It is composed of about 200 flattened lamellæ (plates of collagen fibrils), superimposed one on another.
..... Click the link for more information.
Descemet's membrane is the basement membrane that lies between the corneal proper substance, also called stroma, and the endothelial layer of the cornea. The endothelial layer is located at the posterior of the cornea.
..... Click the link for more information.
..... Click the link for more information.
endothelium is the thin layer of cells that line the interior surface of blood vessels, forming an interface between circulating blood in the lumen and the rest of the vessel wall. Endothelial cells line the entire circulatory system, from the heart to the smallest capillary.
..... Click the link for more information.
..... Click the link for more information.
anterior chamber is the fluid-filled space inside the eye between the iris and the cornea's innermost surface, the endothelium.[1] Aqueous humor is the fluid that fills the anterior chamber.
..... Click the link for more information.
..... Click the link for more information.
The substantia propria (or stroma of cornea) is fibrous, tough, unyielding, and perfectly transparent.
It is composed of about 200 flattened lamellæ (plates of collagen fibrils), superimposed one on another.
..... Click the link for more information.
It is composed of about 200 flattened lamellæ (plates of collagen fibrils), superimposed one on another.
..... Click the link for more information.
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eye's optical power.[1] Together with the lens, the cornea refracts light, and as a result helps the eye to focus, accounting for approximately
..... Click the link for more information.
..... Click the link for more information.
Fusiform means having a spindle-like shape that is wide in the middle and tapers at both ends.
..... Click the link for more information.
- Aneurysms can be classified as saccular or fusiform
- In botany, a fusiform cell or other plant structure is spindle-like and tapers at both ends
..... Click the link for more information.
The sclera is the opaque (usually white), fibrous, protective layer of the eye containing collagen and elastic fibers.[1] In children, it is thinner and shows some of the underlying pigment, appearing slightly blue.
..... Click the link for more information.
..... Click the link for more information.
epithelium is a tissue composed of a layer of cells. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies. The outermost layer of our skin is composed of dead stratified squamous, keratinized epithelial cells.
..... Click the link for more information.
..... Click the link for more information.
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eye's optical power.[1] Together with the lens, the cornea refracts light, and as a result helps the eye to focus, accounting for approximately
..... Click the link for more information.
..... Click the link for more information.
Latin}}}
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
..... Click the link for more information.
Official status
Official language of: Vatican City
Used for official purposes, but not spoken in everyday speech
Regulated by: Opus Fundatum Latinitas
Roman Catholic Church
Language codes
ISO 639-1: la
ISO 639-2: lat
..... Click the link for more information.
Elsevier, the world's largest publisher of medical and scientific literature, forms part of the Reed Elsevier group. Based in Amsterdam, the company has substantial operations in the UK, USA and elsewhere.
..... Click the link for more information.
..... Click the link for more information.
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eye's optical power.[1] Together with the lens, the cornea refracts light, and as a result helps the eye to focus, accounting for approximately
..... Click the link for more information.
..... Click the link for more information.
The sclera is the opaque (usually white), fibrous, protective layer of the eye containing collagen and elastic fibers.[1] In children, it is thinner and shows some of the underlying pigment, appearing slightly blue.
..... Click the link for more information.
..... Click the link for more information.
Keratoconus
Classification & external resources
The "conical cornea" that is characteristic of keratoconus
ICD-10 H 18.6
ICD-9 371.6
OMIM 148300
DiseasesDB 7158
MedlinePlus 001013
eMedicine oph/104
Keratoconus
..... Click the link for more information.
Classification & external resources
The "conical cornea" that is characteristic of keratoconus
ICD-10 H 18.6
ICD-9 371.6
OMIM 148300
DiseasesDB 7158
MedlinePlus 001013
eMedicine oph/104
Keratoconus
..... Click the link for more information.
sensory system: in this case, vision, for the visual system. ]]
A sensory system is a part of the nervous system responsible for processing sensory information.
..... Click the link for more information.
A sensory system is a part of the nervous system responsible for processing sensory information.
..... Click the link for more information.
The visual system is the part of the nervous system which allows organisms to see. It interprets the information from visible light to build a representation of the world surrounding the body.
..... Click the link for more information.
..... Click the link for more information.
Eyes are organs of vision that detect light. Different kinds of light-sensitive organs are found in a variety of organisms. The simplest eyes do nothing but detect whether the surroundings are light or dark, while more complex eyes can distinguish shapes and colors.
..... Click the link for more information.
..... Click the link for more information.
The sclera and cornea form the fibrous tunic of the bulb of the eye; the sclera is opaque, and constitutes the posterior five-sixths of the tunic; the cornea is transparent, and forms the anterior sixth.
..... Click the link for more information.
..... Click the link for more information.
The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids.
..... Click the link for more information.
Function
It helps lubricate the eye by producing mucus and tears, although a smaller volume of tears than the lacrimal gland...... Click the link for more information.
The sclera is the opaque (usually white), fibrous, protective layer of the eye containing collagen and elastic fibers.[1] In children, it is thinner and shows some of the underlying pigment, appearing slightly blue.
..... Click the link for more information.
..... Click the link for more information.
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.
..... Click the link for more information.
..... Click the link for more information.
The trabecular meshwork is an area of tissue in the eye located around the base of the cornea, near the ciliary body, and is responsible for draining the aqueous humor from the eye via the anterior chamber (the chamber on the front of the eye covered by the cornea).
..... Click the link for more information.
..... Click the link for more information.
The corneal limbus is the border of the cornea and the sclera. It is the attachment of several extraocular muscles.
..... Click the link for more information.
External links
- Atlas of anatomy at UMich eye_1 - "Sagittal Section Through the Eyeball"
- http://www.vetmed.ucdavis.
..... Click the link for more information.
The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eye's optical power.[1] Together with the lens, the cornea refracts light, and as a result helps the eye to focus, accounting for approximately
..... Click the link for more information.
..... Click the link for more information.
The corneal epithelium (epithelium corneæ anterior layer) covers the front of the cornea and consists of several layers of cells.
The cells of the deepest layer are columnar; then follow two or three layers of polyhedral cells, the majority of which are
..... Click the link for more information.
The cells of the deepest layer are columnar; then follow two or three layers of polyhedral cells, the majority of which are
..... Click the link for more information.
The Bowman's membrane (Bowman's layer, anterior limiting lamina, anterior elastic lamina) is a smooth layer in the eye. It is located between the front epithelium and the stroma in the cornea.
..... Click the link for more information.
..... Click the link for more information.
Descemet's membrane is the basement membrane that lies between the corneal proper substance, also called stroma, and the endothelial layer of the cornea. The endothelial layer is located at the posterior of the cornea.
..... Click the link for more information.
..... Click the link for more information.
This article is copied from an article on Wikipedia.org - the free encyclopedia created and edited by online user community. The text was not checked or edited by anyone on our staff. Although the vast majority of the wikipedia encyclopedia articles provide accurate and timely information please do not assume the accuracy of any particular article. This article is distributed under the terms of GNU Free Documentation License.