Stroma of iris

Information about Stroma of iris

The upper half of a sagittal section through the front of the eyeball. ("Stroma of iris" labeled at bottom right.)
Latinstroma iridis
subject #225 1013
The stroma of the iris consists of fibers and cells.

The former are made up of delicate bundles of fibrous tissue; a few fibers at the circumference of the iris have a circular direction; but the majority radiate toward the pupil, forming by their interlacement, delicate meshes, in which the vessels and nerves are contained.

Interspersed between the bundles of connective tissue are numerous branched cells with fine processes.

In dark eyes many of them contain pigment granules, but in blue eyes and the eyes of albinos they are unpigmented.

External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.

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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 segmentAnterior chamber • Aqueous humour • Posterior chamber • Lens
Posterior segmentVitreous humour • Zonular fibers • Zonule of Zinn
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
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In anatomy, the iris (plural irises or irides) is the most visible part of the eye of vertebrates, including humans. The following describes the iris of vertebrates, not the independently evolved iris found in some cephalopods.
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The pupil (Latin pupilla "little doll" > pupa "doll") is the variable-sized, black circular or slit shaped opening in the center of the iris that regulates the amount of light that enters the eye.
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A nerve is an enclosed, cable-like bundle of axons (the long, slender projection of a neuron). Neurons are sometimes called nerve cells, though this term is technically imprecise since many neurons do not form nerves, and nerves also include the glial cells that
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pigment is a material that changes the color of light it reflects as the result of selective color absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which the material itself emits light.
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Albinism
Classification & external resources

Albinistic boy
ICD-10 E 70.3
ICD-9 270.2

OMIM 203100 103470 , 203200 , 203280 ,
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eMedicine is an online clinical medical knowledge base that was founded in 1996 by Scott Plantz and Richard Lavely, two medical doctors. It was sold to WebMD in January 2006.
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The College of Medicine at Urbana-Champaign is a graduate school at the University of Illinois at Urbana-Champaign.The UIC College of Medicine at Urbana-Champaign is located at the original campus of the University (with 42,000 students, undergraduate and graduate) and offers a
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Public domain comprises the body of knowledge and innovation (especially creative works such as writing, art, music, and inventions) in relation to which no person or other legal entity can establish or maintain proprietary interests within a particular legal jurisdiction.
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Henry Gray's Anatomy of the Human Body (or Gray's Anatomy as it has commonly been shortened) is an English-language human anatomy textbook widely regarded as a classic work on the subject.
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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.
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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.
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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.
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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.
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The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids.

Function

It helps lubricate the eye by producing mucus and tears, although a smaller volume of tears than the lacrimal gland.
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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.
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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.
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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).
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The corneal limbus is the border of the cornea and the sclera. It is the attachment of several extraocular muscles.

External links

  • Atlas of anatomy at UMich eye_1 - "Sagittal Section Through the Eyeball"
  • http://www.vetmed.ucdavis.

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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
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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
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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.
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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.
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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.
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For the lining of blood vessels, see endothelium


The corneal endothelium is a monolayer of specialized, flattened, mitochondria-rich cells that lines the posterior surface of the cornea and faces the anterior chamber of the eye.
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For the Pacific island, see Wallis Island.
The uvea (Lat. uva, grape), also called the uveal layer, uveal coat, uveal tract, or vascular tunic
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The choroid, also known as the choroidea or choroid coat, is the vascular layer of the eye lying between the retina and the sclera, with a thickness about 0.5 mm. The choroid provides oxygen and nourishment to the outer layers of the retina [1] .
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The ciliary processes are formed by the inward folding of the various layers of the choroid, i.e., the choroid proper and the lamina basalis, and are received between corresponding foldings of the suspensory ligament of the lens.
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The choriocapillaris is a layer of capillaries that is immediately adjacent to Bruch's membrane in the choroid.

External links

  • http://www.trinity.edu/rblyston/MicroA/Lectures/L31-html/sld015.

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Bruch's membrane is the innermost layer of the choroid. It is also called the vitreous lamina, because of its glassy microscopic appearance. It is 2–4 μm thick.
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