- 1. discontinuous venous lacunae, relatively free of villi, near the edge of the placenta. They were originally thought to be circumferentially continuous and important for placental drainage; their existence has not been confirmed. 2. bowl-shaped lymph sinuses separating the capsule from the cortical parenchyma of a lymph node, and from which lymph flows into the cortical sinuses; called also subcapsular s's. 3. see s. marginalis.
Medical dictionary. 2011.
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