Question

multiple select question select all that apply select all of the statements that are true about the pia mater. it is a thin membrane without blood vessels. it is closest to the surface of the spinal cord. it is attached to the inner surfaces of the cranial bone. it is closest to the surface of the brain. it penetrates into each groove of the brain.

Explanation:

The pia mater is the innermost layer of the meninges. It is a thin, delicate membrane that contains blood - vessels. It closely follows the contours of the brain and spinal cord, being closest to their surfaces and penetrating into the grooves of the brain. It is not attached to the inner surfaces of the cranial bone (the dura mater is attached to the cranial bone).

Answer:

It is closest to the surface of the spinal cord.
It is closest to the surface of the brain.
It penetrates into each groove of the brain.