anterior chamber

anterior chamber

Etymology: L, ante + prior, foremost; Gk, kamara, an arched cover

the part of the anterior cavity of the eye in front of the iris. It contains the aqueous humor.

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chamber [chām´ber]

an enclosed space.

Chambers of the eye. From Dorland's, 2000.

anterior chamber the part of the aqueous humor-containing space of the eyeball between the cornea and iris.

counting chamber the part of a hemacytometer consisting of a microscopic slide with a depression whose base is marked in grids, and into which a measured volume of a sample of blood or bacterial culture is placed and covered with a cover glass. The number of cells and formed blood elements in the squares is counted under a microscope and used as a representative sample for calculating the unit volume.

drip chamber the expanded portion of intravenous tubing into which fluid falls, where the rate of flow can be monitored if necessary. See also intravenous infusion.

hyperbaric chamber an enclosed space in which gas (oxygen) can be raised to greater than atmospheric pressure; see also hyperbaric oxygenation.

ionization chamber an enclosure containing two or more electrodes between which an electric current may be passed when the enclosed gas is ionized by radiation; used for determining the intensity of x-rays and other rays.

posterior chamber that part of the aqueous humor–containing space of the eyeball between the iris and the lens.

vitreous chamber the vitreous humor–containing space in the eyeball, bounded anteriorly by the lens and ciliary body and posteriorly by the posterior wall of the eyeball.

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anterior

situated at or directed toward the front; opposite of posterior. In quadrupeds the use of the term is limited to parts of the head but is often used to mean cranially. In bipeds such as humans it is synonymous with ventral.

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anterior abdomen pain

elicited pain in the anterior abdomen caused, in cattle, by reticulitis, hepatic or splenic abscess, abomasal ulcer and intestinal obstruction.

anterior chamber

the part of the eyeball between the cornea and the iris, filled with aqueous humor.

anterior chamber angle

see iridocorneal angle.

anterior compartment

chamber of the eye bounded by the iris and cornea; contains the aqueous humor as it moves to the filtration angle; called also anterior chamber.

anterior cruciate ligament

see cranial (anterior) cruciate ligament.

anterior (cranial) drawer sign

cranial, nonrotary movement of the proximal tibia in relation to the distal femur. Normally restricted by the cranial (anterior) cruciate ligament and used as a diagnostic test for rupture of that structure.

anterior epithelial layer

of the cornea is a noncornified, stratified, squamous epithelium, continuous with the bulbar conjunctival epithelium.

anterior functional stenosis

achalasia of the reticulo-omasal sphincter causing ingesta to accumulate in the reticulorumen.

anterior limiting membrane

of the cornea is a combination of the basement membrane, a felted layer of fine collagen fibers; substantial only in primates.

anterior pituitary

see adenohypophysis.

anterior pituitary hormones

see adenohypophysis.

anterior station trypanosomes

a section of the genus Trypanosoma in which the infectious stages accumulate in the mouthparts and salivary glands of the intermediate host so that the parasite is transmitted when the insect vector takes a blood meal. Called also Salivaria. See also posterior station trypanosomes.

anterior vena cava

see vena cava.

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chamber

an enclosed space.

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anterior chamber

the part of the aqueous humor-containing space of the eyeball between the cornea and iris.

hyperbaric chamber

an enclosed space in which gas (oxygen) can be raised to greater than atmospheric pressure. See also hyperbaric oxygenation.

ionization chamber

see ionization chamber.

posterior chamber

that part of the aqueous humor-containing space of the eyeball between the iris and the lens.

vitreous chamber

the vitreous humor-containing space in the eyeball, bounded anteriorly by the lens and ciliary body and posteriorly by the posterior wall of the eyeball.