In sub arachnoid space CSF is present then what lies inside sub dural cavity?

Dear student.

Please find the solution below.

Subarachnoid space is found in the brain which is the space filled with cerebrospinal fluid. This space between the pia mater and arachnoid membrane. Subarachnoid space surrounds brain and spinal cord. 

Subdural space is the space between 
dura mater and the arachnoid mater​ (not fused). Lymph-like fluid is present in the subdural space.


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