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Encyclopedia > Conjunctiva
Conjunctiva
The upper half of a sagittal section through the front of the eyeball. (Label for 'Conjunctiva' visible at center-left.)
Horizontal section of the eyeball. (Conjunctiva labeled at upper left.)
Gray's subject #227 1026
Artery lacrimal artery, anterior ciliary arteries
Nerve lacrimal nerve
MeSH Conjunctiva
Image of a human eye clearly showing the blood vessels of the conjuntiva.
Image of a human eye clearly showing the blood vessels of the conjuntiva.

The conjunctiva is a clear membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids. it is made of lymphoid tissue Image File history File links Download high-resolution version (600x682, 127 KB) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Wikipedia:Grays Anatomy images with missing articles 18 Conjunctiva Lens capsule Iris dilator muscle Iris sphincter muscle... Image File history File links Gray869. ... Section of an artery For other uses, see Artery (disambiguation). ... The Lacrimal Artery arises close to the optic foramen, and is one of the largest branches derived from the ophthalmic: not infrequently it is given off before the artery enters the orbit. ... The anterior ciliary arteries are derived from the muscular branches of the Ophthalmic Artery. ... For other uses, see Nerve (disambiguation). ... The Lacrimal Nerve is the smallest of the three branches of the ophthalmic. ... Medical Subject Headings (MeSH) is a huge controlled vocabulary (or metadata system) for the purpose of indexing journal articles and books in the life sciences. ... Schematic diagram of the human eye. ... For other uses, see Eye (disambiguation). ... An eyelid is a thin fold of skin that covers and protects an eye. ...

Contents

Function

It helps lubricate the eye by producing mucus and tears, although a smaller volume of tears than the lacrimal gland.[1] It also contributes to immune surveillance and helps to prevent the entrance of microbes into the eye. For other uses, see Eye (disambiguation). ... Mucus cells. ... The tear system. ... The tear system. ... The lacrimal glands are paired glands, one for each eye, that secrete the aqueous layer of the tear film. ... A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). ... A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). ...


Histology

The conjunctiva is typically divided into three parts: A thin section of lung tissue stained with hematoxylin and eosin. ...

  1. Palpebral or tarsal conjunctiva: The conjunctiva lining the eyelids.
  2. Fornix conjunctiva: The conjunctiva where the inner part of the eyelids and the eyeball meet, the palpebral conjunctiva is reflected at the superior fornix and the inferior fornix to become the bulbar conjunctiva.
  3. Bulbar or ocular conjunctiva: The conjunctiva covering the eyeball, over the sclera. This region of the conjunctiva is bound tightly and moves with the eyeball movements.

Schematic diagram of the human eye. ...

Diseases and disorders

Disorders of the conjunctiva and cornea are a common source of eye complaints. This is a partial list of human eye diseases and disorders. ... The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eyes optical power [1]. Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. ...


The surface of the eye is exposed to various external influences and is especially suspectible to trauma, infections, and allergic reactions. In medicine, a trauma patient has suffered serious and life-threatening physical injury resulting in secondary complications such as shock, respiratory failure and death. ... Infection is also the title of an episode of the television series Babylon 5; see Infection (Babylon 5). ... This article needs cleanup. ...


The conjunctiva is best known because of its inflamed state, conjunctivitis (more commonly known as pinkeye). An abscess on the skin, showing the redness and swelling characteristic of inflammation. ...


Conjunctival irritation is one of the adverse health effects that can take place after overexposure to VOCs (Volatile organic compounds). This article describes a highly specialized aspect of its subject in the Terminology and legal definitions section. ...


See also

A Pinguecula is a type of conjunctival degeneration in the eye. ... A pterygium, meaning wing, is a benign growth of the conjunctiva. ...

Additional images

References

  1. ^ London Place Eye Center (2003). Conjunctivitis. Retrieved July 25, 2004.

External links

A garden sign welcomes residents and visitors to Rogers Park as home of Loyola University Chicago. ... The human eye is the first element of a sensory system: in this case, vision, for the visual system. ... The visual system is the part of the nervous system which allows organisms to see. ... For other uses, see Eye (disambiguation). ... 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. ... Schematic diagram of the human eye. ... Schlemms 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. ... This is an area of tissue located around the base of the cornea, near the ciliary body, and is responsible for draining the aqueous humour from the eye via the anterior chamber (the chamber on the front of the eye covered by the cornea). ... The corneal limbus is the border of the cornea and the sclera. ... The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber, providing most of an eyes optical power [1]. Together with the lens, the cornea refracts light and, as a result, helps the eye to focus. ... The corneal epithelium (epithelium corneæ anterior layer) covers the front of the cornea and consists of several layers of cells. ... The Bowmans membrane is a smooth layer in the eye. ... The substantia propria (or stroma of cornea) is fibrous, tough, unyielding, and perfectly transparent. ... Descemets membrane is the basement membrane that lies between the corneal proper substance, also called stroma, and the endothelial layer of the cornea. ... Corneal endothelium is the inner most layer of the cornea, the corneal endothelium is actually a monolayer of squamate epithelial cells lining the anterior chamber of the eye. ... For the Pacific island, see Wallis Island. ... The choroid, also known as the choroidea or choroid coat, is the vascular layer of the eye lying between the retina and the sclera. ... The ciliary processes are formed by the inward folding of the various layers of the choroid, i. ... The choriocapillaris is a layer of capillaries that is immediately adjacent to Bruchs membrane in the choroid. ... Bruchs membrane is the innermost layer of the choroid. ... In anatomy, the iris (plural irises or irides) is the most visible part of the eye of vertebrates, including humans. ... The stroma of the iris consists of fibers and cells. ... The human eye The pupil is the central transparent area (showing as black). ... Schematic diagram of the human eye The ciliary body is the part of the eye containing the ciliary muscle and ciliary processes. ... Human eye cross-sectional view. ... Human eye cross-sectional view. ... The fovea, a part of the eye, is a spot located in the center of the macula. ... The optic disc or optic nerve head is the location where ganglion cell axons exit the eye to form the optic nerve. ... anterior segment ... The anterior chamber if the fluid-filled space inside the eye between the iris and the corneas innermost surface, the endothelium . ... Schematic diagram of the human eye. ... The posterior chamber is a narrow chink behind the peripheral part of the iris, and in front of the suspensory ligament of the lens and the ciliary processes. ... Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. ... The posterior segment is the back two-thirds of the eye that includes the anterior hyaloid membrane and all structures behind it: the vitreous humor, retina, choroid, and optic nerve. ... Vitreous humour is the clear aqueous solution that fills the space between the lens and the retina of the vertebrate eyeball. ... The zonule of Zinn is a ring of fibrous strands connecting the ciliary body with the crystalline lens of the eye. ... Autonomic nervous system innervation, showing the sympathetic and parasympathetic (craniosacral) systems, in red and blue, respectively The parasympathetic nervous system is one of three divisions of the autonomic nervous system. ... The ciliary muscle is a smooth muscle of the head that is responsible for accommodation of the eye // The ciliary muscle affects zonular fibers in the eye (fibers that suspend the lens in position during accommodation), enabling changes in lens shape for light focusing. ... The Iris sphincter muscle is a muscle of the human body. ... The Sympathetic Nervous System (SNS) is a branch of the autonomic nervous system. ... The iris dilator muscle (pupil dilator muscle, pupillary dilator, radial muscle of iris, radiating fibers), is a muscle of the eye. ...

  Results from FactBites:
 
Conjunctiva - Wikipedia, the free encyclopedia (241 words)
The conjunctiva is a membrane that covers the sclera (white part of the eye) and lines the inside of the eyelids.
Disorders of the conjunctiva and cornea are a common source of eye complaints.
The surface of the eye is exposed to various external influences and is especially suspectible to trauma, infections, and allergic reactions.
Encyclopedia - Conjunctiva (366 words)
Although the conjunctiva is normally a tough, resilient tissue, in cases of ocular trauma, it may be lacerated with sharp or pointed objects such as fingernails, tree branches, or the edge of a piece of paper.
Within the bulbar, conjunctivae are "goblet cells" that secrete an important component of the pre-corneal tear layer, which protects and nourishes the cornea.
The fornix is a loose pocket of conjunctiva between the upper eyelid and the eyeball that permits the eyeball to rotate freely.
  More results at FactBites »

 
 

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