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Laboratory 2. Vertebral Canal and Spinal Cord
Step 4. Incise the Dura Mater

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Incise the dura mater along the midline to expose the arachnoid mater. The space between the dura mater and arachnoid mater is called the subdural space. In the cadaver, the extent of this space is increased. In the living state, it is a narrow potential space (Figure 2.4 and Figure 2.5).

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