transitional zone


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zone

 [zōn]
an encircling region or area; by extension, any area with specific characteristics or boundary.
ciliary zone the outer of the two regions into which the anterior surface of the iris is divided by the collarette.
comfort zone an environmental temperature between 13 and 21°C (55 and 70°F) with a humidity of 30 to 55 per cent.
epileptogenic zone an area, stimulation of which may provoke an epileptic seizure.
erogenous zone (erotogenic zone) in psychoanalytic theory, an area of the body through which the libido expresses itself and which is therefore susceptible to erotic excitation upon stimulation; the primary sites are the oral, anal, and genital regions, but the other body orifices, breasts, and skin are also included.
zone of partial preservation in spinal cord injury, an area of only partial damage that may include up to three consecutive spinal segments caudal to the level of the injury.
pupillary zone the inner of the two regions into which the anterior surface of the iris is divided by the collarette.
transition zone (transitional zone) any anatomical region that marks the point at which the constituents of a structure change from one type to another; for example, the circle in the equator of the ocular lens in which epithelial fibers are developed into lens fibers, or the zone (anocutaneous line) that marks the junction of stratified squamous epithelium with columnar epithelium.

tran·si·tion·al zone

1. the equatorial region of the lens of the eye where the anterior epithelial cells become transformed into lens fibers;
2. that portion of a scleral contact lens between the corneal and scleral sections.

transitional zone

Etymology: L, transire, to go through; Gk, zone, belt
a part of the crystalline lens of the eye where epithelial-capsule cells change into lens fibers.

tran·si·tion·al zone

(tran-zish'ŭn-ăl zōn)
1. The equatorial region of the lens of the eye where the anterior epithelial cells become transformed into lens fibers.
2. That portion of a scleral contact lens between the corneal and scleral sections.

zone

an encircling region or area; by extension, any area with specific characteristics or boundary. See also zona.

autonomous innervation zone
areas of innervation supplied by a single nerve, as for example the patch of skin on the medial side of the horse fore pastern which is supplied solely by the median nerve; used to assess the integrity of individual nerves.
ciliary zone
the outer of the two regions into which the anterior surface of the iris is divided by the angular line.
comfort zone
an environmental temperature between 55° and 70° F (13° and 21° C) with a humidity of 30 to 55%.
epileptogenic zone
an area, stimulation of which may provoke an epileptic seizure.
zone of inhibition
the area without bacterial growth surrounding an antimicrobial-impregnated disk in an antimicrobial sensitivity test.
provisional calcification zone
in developing bone longitudinal tubes of mineralized matrix which surround hypertrophic chondrocytes.
transitional zone
the circle in the equator of the lens of the eye in which epithelial fibers are developed into lens fibers.
References in periodicals archive ?
3], MnO, porosity) with the facies and sedimentary cyclicity, (c) to compare the evolution of the process of dolomitization in shallow shelf and transitional zones.
Anal glands arise from the anal sinuses in the anal transitional zone and are composed of a mixture of cell types similar to that found in the surface epithelium of the normal anal transitional zone.
virginica, a stronger signal of cytonuclear disequilibria might be expected than was observed in the transitional zone.
Climbing to the Transitional Zone of the mountain, we encounter Higher-Order Competencies.
Global and regional warming trends have long been identified and associated with exacerbated wildfire occurrence but extreme injection by thunderstorms was previously judged to be unlikely because the tropopause, a transitional zone from the troposphere to the stratosphere, is considered to be a strong barrier to convection.
This transitional zone beneath soils and above groundwater is often overlooked when it comes to studying hydrologic processes, but researchers found that the water contained in the fractures and pores of the rock could play an important role in the water cycle at local and global levels.
The Beach is a transitional zone between the harder high-rise urban edge of JBR and the softer outline of The Beach.
There were no significant differences in preoperative parameters including age, body mass index, presence of comorbidities, serum PSA, volume of prostate and transitional zone, symptom score and urodynamic variables between 2 groups.
Above the dentate line is a transitional zone or cloacogenic zone, lined by non-keratinizing squamous epithelial tumor by transitional--type epithelium resembling urothelium.
Around this tatami island, is a continuous wooden desk - with fully integrated accessible IT kit - that KDa have called the engawa desk, referring to the transitional zone between inside and outside that is so fundamentally embedded in traditional Japanese architecture.
Main interest was focused on the deposition of mixed fine siliciclastic-carbonate sediments in southern Estonia and the Gotland area (Gotland Island, Gotska Sandon, and the surrounding submarine exposures), in the transitional zone between the confacies belts.
Fibers greater than 100 [micro]m in diameter were specific for aganglionic tissue; they were not seen in the transitional zone, but they occurred in only 6 of 10 resection specimens and in none of the HD rectal biopsies.