Marginal sinus is a term used in anatomy to describe a channel or space that separates two layers of tissue. Some synonyms for marginal sinus include lymphatic sinus, sinuses of the dura mater, venous sinus, and subarachnoid space. These sinuses can be found throughout the body, including the brain, spinal cord, and spleen. They are responsible for regulating fluid flow, immune response, and waste removal. Understanding the various synonyms for marginal sinus can help medical professionals accurately communicate information about the location and function of these important anatomical features.