Which layer of the meninges forms the tough and fibrous outer sac?
A) dura mater
B) pia mater
C) subdural layer
D) arachnoid layer
A) dura mater
The dura mater is the tough and fibrous outer sac of the meninges. The pia mater is
the innermost membrane layer that is applied directly to the brain and spinal cord. The subdural
space is the actual space between the dura mater and arachnoid layers. The arachnoid layer is a
thin, delicate layer attached to the pia mater by weblike filaments.
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