| plexus vasculosus | A vascular network formed by frequent anastomoses between the blood vessels (arteries or veins) of a part. Synonym: plexus vasculosus. (05 Mar 2000) |
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| circulus | 1. Any ringlike structure. 2. A circle formed by connecting arteries, veins, or nerves. Origin: L. Dim. Of circus, circle (05 Mar 2000) |
| circulus arteriosus cerebri | An anastomotic "circle" of arteries (roughly pentagonal in outline) at the base of the brain, formed, sequentially and in anterior to posterior direction, by the anterior communicating artery, the two anterior cerebral, the two internal carotid, the two posterior communicating, and the two posterior cerebral arteries. Synonym: circulus arteriosus cerebri, circle of Willis. (05 Mar 2000) |
| circulus arteriosus halleri | <anatomy, nerve> A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve. Synonym: circulus vasculosus nervi optici, circulus arteriosus halleri, circulus zinnii, Haller's circle, Zinn's corona, Zinn's vascular circle. (05 Mar 2000) |
| circulus arteriosus iridis major | An arterial circle at the ciliary border of the iris. Synonym: circulus arteriosus iridis major. (05 Mar 2000) |
| circulus arteriosus iridis minor | An arterial circle near the pupillary margin of the iris. Synonym: circulus arteriosus iridis minor. (05 Mar 2000) |
| circulus venosus halleri | areolar venous plexus |
| circulus venosus ridleyi | Dural venous formation which surrounds the hypophysis, composed of right and left cavernous sinuses and the intercavernous sinuses. Synonym: circulus venosus ridleyi, Ridley's circle. A venous sinus at the periphery of the placenta. Synonym: sinus venosus sclerae. (05 Mar 2000) |
| circulus zinnii | <anatomy, nerve> A network of branches of the short ciliary arteries on the sclera around the point of entrance of the optic nerve. Synonym: circulus vasculosus nervi optici, circulus arteriosus halleri, circulus zinnii, Haller's circle, Zinn's corona, Zinn's vascular circle. (05 Mar 2000) |
| ramus communicans nervi glossopharyngei cum ramo auriculari nervi vagalis | <anatomy, nerve> A small branch of the glossopharyngeal nerve which joins the auricular branch of the vagus, conveying tactile fibres. Synonym: ramus communicans cum nervo glossopharyngeo, ramus communicans nervi glossopharyngei cum ramo auriculari nervi vagalis. (05 Mar 2000) |
| radix lateralis tractus optici | The larger division of the posterior end of the optic tract that terminates in the lateral geniculate body. Synonym: radix lateralis tractus optici. (05 Mar 2000) |
| radix medialis tractus optici | The smaller division of the posterior end of the optic tract that disappears under the medial geniculate body. Synonym: radix medialis tractus optici. (05 Mar 2000) |
| rami tractus optici | The optic tract branches, branches of the anterior choroid artery to the optic tract. (05 Mar 2000) |
| area nervi facialis | <anatomy, nerve> The area in the fundus of the internal acoustic meatus superior to the transverse crest through which the facial nerve passes to enter the facial canal. Synonym: area nervi facialis. (05 Mar 2000) |
| arteria comes nervi phrenici | <anatomy, artery> Origin, internal thoracic; distribution, pericardium, diaphragm, and pleura; anastomoses, musculophrenic, inferior phrenic, mediastinal and pericardial branches of the internal thoracic. Synonym: arteria pericardiacophrenica, arteria comes nervi phrenici. (05 Mar 2000) |