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Medical Term:

circular sinus



  1. dural venous formation that surrounds the hypophysis, composed of right and left cavernous sinuses and the intercavernous sinuses;
  2. a venous sinus at the periphery of the placenta;

Synonym(s): scleral venous sinus

Synonym(s): circulus venosus ridleyi, Ridley circle

© Copyright 2016 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.