marginal sinuses

marginal sinuses
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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