
Dictionary » R » Ridleys circle Ridleys circleRidley's circle --> 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. ![]()
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