Final answer:
The three layers of tissue between the brain and the spinal cord are the dura mater, arachnoid mater, and pia mater, collectively known as the meninges. The meninges serve as protective coverings and the space between them contains cerebrospinal fluid for cushioning.
Step-by-step explanation:
The three layers of tissue between the brain and the spinal cord are known as the meninges. These protective coverings consist of the following layers:
Dura mater: The outermost and thickest layer that acts as a durable protective sheath for the brain and spinal cord.
Arachnoid mater: The middle layer, which is a web-like membrane that lies beneath the dura mater.
Pia mater: The innermost layer that closely covers the brain and spinal cord, extending into its convolutions.
The space between the arachnoid and pia maters is filled with cerebrospinal fluid (CSF), which provides cushioning and serves to circulate chemical substances throughout the brain and spinal cord.