pupillary zone

zone (zōn) an encircling region or area; by extension, any area with specific characteristics or boundary.zo´nal

---

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°–70°F) with a humidity of 30 to 55 per cent.

epileptogenic zone  see under focus.

erogenous zone , erotogenic zone an area of the body whose stimulation produces erotic excitation.

inner zone of renal medulla  the part of the medulla farthest in from the cortex, containing ascending and descending limbs of the thin tubule as well as the inner part of the medullary collecting duct.

Lissauer's marginal zone  a bridge of white substance between the apex of the posterior horn and the periphery of the spinal cord.

outer zone of renal medulla  the part of the medulla nearest to the cortex; containing the medullary part of the distal straight tubule as well as the outer part of the medullary collecting duct.

zone of partial preservation  in spinal cord injury, a region where there may be only partial damage to nerves, including one to three spinal segments below the level of the injury.

pellucid zone  zona pellucida.

pupillary zone  the inner of the two regions into which the anterior surface of the iris is divided by the collarette.

transitional zone  any anatomical region that marks the point at which the constituents of a structure change from one type to another.

---

pupillary zone

n.

The central region of the anterior surface of the iris of the eye.

---

pupillary

pertaining to or emanating from the pupil.

---

pupillary aperture

the pupil.

pupillary block

an obstruction to the flow of aqueous between the border of the pupil and the anterior capsule of the lens.

pupillary consensual light reflex

constriction of the pupil in the eye opposite to the one receiving an intensified beam of light, and reversal when the light is removed. The reflex is clearcut in humans and dogs but little used in food animals. Presence of the reflex is a guarantee of integrity of the optic pathways.

pupillary constriction

see miosis.

pupillary cyst

see iris cyst.

pupillary dilatation

see mydriasis.

pupillary light reflex

constriction of a dilated pupil in response to an increase in light intensity and a dilatation of a constricted pupil in response to a decrease in the intensity. Activity of the reflex indicates the efficiency of the retina, the optic and oculomotor nerves and the musculature of the iris.

pupillary membranectomy

a surgical technique for resection of an iridocapsular membrane, formed as a sequela to cataract surgery.

persistent pupillary membrane

nonvascular remnants of the tunica vasculosa lentis may extend across the iris or from the iris to the cornea, often producing a corneal opacity at the site. A common defect in dogs, particularly in Basenjis.

pupillary zone

the portion of iris closest to the pupillary border.