what are meninges
three consecutive tissues that surround the brain and spinal cord
what are the three meninges
dura mater, arachnoid, pia mater
what is dura mater
outer msot membrane made of white fibrous connective tissue
what are the two layers of dura mater
cranial/periosteal dura mater and meningeal dura mater
what is cranial/periosteal dura mater
makes direct contact with cranial bones
what is meningeal dura mater
found below and separate from cranial dura mater
what are venous blood sinuses
some areas of the meningeal dura mater that are layers separates by spaces filled with blood (ex.: superior sagittal sinus)
what else can happen in meningeal DM
in other areas the two layers of the meningeal DM are fused and form a partition (ex.: falx cerebri-between two cerebral hemispheres and falx cerebelli-between cerebrum and cerebellum)
what covers the spinal cord
one layer called the meningeal or spinal DM that is continuous with meningeal DM of brain
what is subdural space
potential free space located between the meningeal DM of brain and spinal cord and the arachnoid membrane (Second meninge) ex.: subdural hematoma
what is arachnoid
the middle meninge
what is the arachnoid membrane
adjacent to meningeal DM of brain and spinal cord
what is the arachnoid trabeculae
fine partitions that create compatments within sub-arachnoid space below arachnoid membrane
what is sub-arachnoid space
space filled with cerebrospinal fluid (contains small arterioles)
what is the pia mater
inner meninge that is highly vascularized and is in direct contact with brain and spinal cord
what is meningitis
inflammation of meninges caused by bacterial or viral infections
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