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==Subdural space==

*# Subdural space

The subdural space lies between the dura and the next meningial layer, the arachnoid mater (not fused). The subdural space is thought to contain only lymph-like fluid. This space can also be the site of a subdural hematoma.

*#* Lies between dura and arachnoid (not fused). Potential space containing only lymph-like fluid. Site of subdural hematoma.  

*# Arachnoid mater

*#* Delicate, non-vascular connective tissue

==Arachnoid mater==

*#* Adhered to the skull in the calvaria.

This is the middle meningial layer and lies between the dura mater and the pia mater, the innermost meningeal layer. The arachnoid mater is a delicate structure and is constructed with non-vascular connective tissue. This layer also has small protrusions through the dura mater into the previously mentioned venous sinueses and allow cerebrospinal fluid (CSF) to enter and exit the blood stream. These protrusions adhere to the inner surface of the skull via ''calvaria'' processes.

*# Subarachnoid space

*# Subarachnoid space

*#* between arachnoid and pia connected by tiny filaments (spider-like)

*#* between arachnoid and pia connected by tiny filaments (spider-like)