Diagrammatic transverse section of the medulla spinalis and its membranes. (At border, dura mater is black line, arachnoid mater is blue line, and pia mater is red line.)

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Diagrammatic transverse section of the medulla spinalis and its membranes. (At border, dura mater is black line, arachnoid mater is blue line, and pia mater is red line.)