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circle

 [ser´k'l]
a round figure, structure, or part.
Berry's c's charts with circles on them for testing stereoscopic vision.
cerebral arterial circle circle of Willis.
Minsky's circle a device for the graphic recording of eye lesions.
sensory circle a body area within which it is impossible to distinguish separately the impressions arising from two sites of stimulation.
circle of Willis the anastomotic loop of blood vessels near the base of the brain. Called also cerebral arterial circle.

cir·cle

(ser'kĕl),
1. anatomy a ring-shaped or anular structure or group of structures, as formed by anastomosing arteries or veins, or by connected (communicating) nerves.
2. A line or process with every point approximately equidistant from the center.
Synonym(s): circulus [TA]
[L. circulus]

circle

/cir·cle/ (ser´k'l) a round structure or part.
cerebral arterial circle  c. of Willis.
Berry's circles  charts with circles on them for testing stereoscopic vision.
defensive circle  the coexistence of two conditions which tend to have an antagonistic or inhibiting effect on each other.
circle of Haller  a circle of arteries in the sclera at the site of the entrance of the optic nerve.
Minsky's circles  a series of circles used for the graphic recording of eye lesions.
circle of Willis  the anastomotic loop of vessels near the base of the brain.

circle

Etymology: L, circulus
(in anatomy) a circular or nearly circular structure of the body, such as the circle of Willis and circle of Zinn. circular, adj.

cir·cle

(sĭr'kĕl)
1. A ring-shaped structure or group of structures.
Synonym(s): circulus (1) [TA] .
2. A line or process with every point equidistant from the center.
[L. circulus]

cir·cle

(sĭr'kĕl)
anatomy ring-shaped or anular structure or group of structures, as formed by anastomosing arteries or veins, or by connected (communicating) nerves.
[L. circulus]

circle

a round figure, structure or part.

circle block
see ring block.
ciliary arterial circle
formed from the anterior ciliary arteries; lies within the ciliary muscle.
iridial arterial circle
formed from the posterior long ciliary arteries and supplying blood to the iris.
iridial vascular circle
a ring of vessels formed by the anterior ciliary arteries; provide fine branches to the iris and ciliary body.
circle of safety
circle system
see breathing circuit.
circle test
walking a horse in a small circle, first one direction then the other, is used in a neurological examination to detect ataxia and abnormalities in proprioception.
circle of Willis
anastomotic loop of vessels near the base of the brain. See cerebral arterial circle.
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