Ridleys sinus

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Ridley's sinus --> intercavernous sinuses

The anterior and posterior anastomoses between the cavernous sinus's, passing anterior and posterior to the hypophysis and forming, with the cavernous sinuses, the circular sinus.

Synonym: sinus intercavernosi, ridley's sinus.

jugular sinus

sinus jugularis, one of three enlargements of the jugular veins; the external jugular sinus is between the two sets of valves; the internal jugular sinus's are at the origin (superior bulb) and near the termination (inferior bulb).