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Laboratory 2. Vertebral Canal and Spinal Cord
Step 5. Arachnoid and Subarachnoid Space

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Incise the arachnoid mater to enter the subarachnoid space [tip of the probe]. In the living state, this space contains cerebrospinal fluid (CSF).

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