Exploration of the spinal cord and meninges in situ
Arachnoid in cervical region; cisterna magna
The dura mater has been cut away so that the transparent arachnoid membrane is exposed. The subarachnoid space increases in volume above the level of the second cervical dorsal roots. This is part of the cerebellomedullary cistern (cisterna magna).
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Occipital bone (pointer at margin of foramen magnum)