Final answer:
The subdural space exists between the dura mater and the arachnoid mater, while the subarachnoid space, filled with CSF, is located between the arachnoid mater and the pia mater.
Step-by-step explanation:
Between the dura mater and the arachnoid mater lies the subdural space, and between the arachnoid mater and the pia mater lies the subarachnoid space.
The subdural space is a potential space that can become real if blood or fluid accumulates there. In contrast, the subarachnoid space is an actual space filled with cerebrospinal fluid (CSF) that cushions the brain, acts as a shock absorber, and plays a role in circulating chemical substances throughout the brain and spinal cord.
The arachnoid mater is the middle layer of the meninges, which forms a sac-like enclosure around the CNS. Named for its spider-The space between the dura mater and the arachnoid mater is called the subdural space. This space contains a thin layer of lubricating fluid that helps reduce friction between the dura mater and the arachnoid mater.
The space between the arachnoid mater and the pia mater is called the subarachnoid space. This space is filled with cerebrospinal fluid (CSF) and contains delicate spider-web-like trabeculae that connect the two layers.
web-like trabeculae, the arachnoid mater helps in the reabsorption of CSF into the blood through the arachnoid granulations that emerge into the dural sinuses.