| circular sinus | 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) |
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| circular sulcus of insula | A saemicircular fissure demarcating the insula from the opercula above, below, and behind. Synonym: sulcus circularis insulae, circular sulcus of Reil, limiting sulcus of Reil. (05 Mar 2000) |
| circular sulcus of Reil | A saemicircular fissure demarcating the insula from the opercula above, below, and behind. Synonym: sulcus circularis insulae, circular sulcus of Reil, limiting sulcus of Reil. (05 Mar 2000) |
| circulation | <physiology> Movement in a regular or circuitous course, as the movement of the blood through the heart and blood vessels. Origin: L. Circulatio (18 Nov 1997) |
| circulation time | The time taken for the blood to pass through a given circuit of the vascular system, e.g., the pulmonary or systemic circulation, from one arm to another, from arm to tongue, or from arm to lung; it is measured by the injection into an arm vein of a substance, such as sodium dehydrocholate, ether, fluorescein, histamine, or a radium salt, which can be detected when it arrives at another point in the vascular system. (05 Mar 2000) |
| circulation, foetal | The blood circulation in the foetus (the unborn baby). Before birth, the blood from the heart that is destined (in the pulmonary artery) for the lungs is shunted away from the lungs and returned to the greatest of arteries (the aorta). The shunt is through a short vessel called the ductus arteriosus. When this shunt is open, it is said to be a patent (pronounced pá tent) ductus arteriosus (PDA). The PDA usually closes at or shortly after birth and blood is permitted to course freely to the lungs. (12 Dec 1998) |
| circulatory | Having to do with the circulation, the movement of fluid in a regular or circuitous course. Although the adjective circulatory need not necessarily refer to the circulation of the blood, for all practical purposes today it does. A circulatory problem is taken usually to be a problem with the blood circulation, for example with heart failure. (12 Dec 1998) |
| circulatory and respiratory physiology | Functions and activities of cardiovascular circulation and of respiration and respiratory mechanics. (12 Dec 1998) |
| circulatory arrest | Cessation of the circulation of blood as a result of ventricular standstill or fibrillation. (05 Mar 2000) |
| circulatory collapse | Failure of the circulation, either cardiac or peripheral. (05 Mar 2000) |
| circulatory system | The circulatory system is a composed of the heart, arteries, capillaries and veins. It serves to transport blood low in oxygen from the body to the lungs and heart (veins) and oxygenated blood from the lungs and heart throughout the body (arteries). (see heart, blood). (12 Dec 1998) |
| 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) |
| circumvallate |
surround with or as if with a rampart or other fortification
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| circumcise |
cut the skin over the clitoris cut the foreskin off male babies or teenage boys; "During the bris, the baby boy is circumcised"
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| circumflex femoral vein |
either of two veins that accompany arteries of the same name serving the hip and thigh
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| circumflex humeral artery |
an artery that supplies the shoulder joint and shoulder muscles
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| circumflex iliac artery |
an artery that supplies the lower abdominal walls and skin and the sartorius muscle
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| circ | move around in a circular motion |
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| circ | the circle that touches a curve (on the concave side) and whose radius is the radius of curvature |
| circ | a ring of arteries at the base of the brain |
| circ | move around in a circular motion |
| circ | decorated metal band worn around the head |
| circ | moving in a circle |
| circ | movement once around a course |
| circ | a journey or route all the way around a particular place or area |
| circ | an electrical device that provides a path for electrical current to flow |
| circ | (British) a racetrack for automobile races |
| circ | (law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations) |
| circ | an established itinerary of venues or events that a particular group of people travel to |