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Laboratory 2. Vertebral Canal and Spinal Cord
Step 6. Pia Mater and Denticulate Ligaments

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Identify the pia mater [fine probe]. It is a thin transparent membrane that is firmly adherent to the external surface of the brain and spinal cord. Next, identify the denticulate ligaments, which are serrated, shelf-like lateral extensions of the pia mater. They fuse with the arachnoid and dura mater between the anterior and posterior roots of the spinal nerves throughout the length of the spinal cord. These denticulate ligaments anchor the spinal cord in place within the vertebral canal.

Links and References:
Grant's: 4.63-4.69
Netter: 148 and 155-159
Rohen and Yokochi: 216-218 and 225