circulus

(serku-lus), pl. cir’culi [L. “a ring” “circle. A circle or circuit, mostly arterial, sometimes venous, etc. ¢. arterio’sus halleri, a circle of arteries in the sclera and around the entrance of the optic nerve: called also circulus zinnii.. arterio’sus irid is, two arterial rings in the iris. The c. arterio’sus sridis ma'‘jor surrounds the circumference of the iris; the c. arterio’sus ‘'rid is mi’nor surrounds the pupil. c. arterio’sus will is’‘ii. See circle of Will is. ¢. artic’uli vasculo’sus, the vascular anastomosis which runs about a joint. c. callo’sus hal’leri, the ring of fibrocartilage to which the mitral and tricuspid valves of the heart are attached. c. tonsilla’ris, a plexus of branches of the glo opharyngeal nerve near the tonsil. c. umbilica’lis, an arterial plexus in the sub peritoneal ti ue surrounding the navel. c. vasculo’sus ner’vi op’tic i thalle’ri]. Same as c. arteriosus halleri. c. veno’sus halle’ri, a circle of veins beneath the areola of the nipple. c. veno’sus ho’vii, a venous circuit in the ciliary region of the eye. Ο. veno’sus rid’ley i, a circle of veins around the sella turcica. 6. will is’ii, the circle of Will is. c. sinn’il. See c. arteriosus halleri.