Meninges

Question 1

purpose of meninges

Answer 1

protection to the brain

Question 2

nervous tissue of the brain

Answer 2

soft and delicate

irreplaceable neurons can be injured or destroyed by even slight pressure

Question 3

the brain is protected by

Answer 3

skull

surrounding membranes (meninges)

BBB

Question 4

foramina w/in skull

Answer 4

has many foramina for nerves, blood vessels, and brain structures to pass through

Question 5

foramen magnum

Answer 5

anterior cranial fossa

middle cranial fossa

posterior cranial fossa

Question 6

anterior cranial fossa

Answer 6

frontal lobe

Question 7

middle cranial fossa

Answer 7

temporal lobe

Question 8

posterior cranial fossa

Answer 8

cerebellum and brainstem

Question 9

meningeal membranes

Answer 9

cover and protect CNS structures

protect blood vessels and enclose venous sinuses

contain CSF

form partitions within the skull

Question 10

from outside–>inside, meninge layers

Answer 10

dura mater

arachnoid membrane

pia mater

Question 11

what is the dura mater

Answer 11

leathery

strongest of the meninges

Question 12

what is special about the dura mater

Answer 12

is is a double layer where it surrounds the brain

Question 13

2 layers of the dura mater

Answer 13

rough fibrillated outer surface

inner surface is smooth and lines by a layer of endothelium

Question 14

outer layer

Answer 14

adheres to the inner surfaces of the bones

adhesions being most marked opposite the sutures and at the base of the skull

periosteal layer

Question 15

periosteal layer

Answer 15

superficial

lines the inner surface of the skull

Question 16

inner layer

Answer 16

meningeal layer

true external covering of the brain

Question 17

the dural layers are

Answer 17

fused together except in certain areas

–> where they are enclose the blood filled dural sinuses

Question 18

what do dural sinuses do

Answer 18

collect venous blood and direct it into the internal jugular veins of the neck

Question 19

which dural layer is rich in blood supply

Answer 19

periosteal layer

Question 20

which layer has no vasular supply

Answer 20

meningeal layer

Question 21

arachnoid mater

Answer 21

thin

glistening connective tissue layer

Question 22

what is special about the arachnoid layer

Answer 22

brain can be seen beneath the transparent arachnoid

Question 23

what does the arachnoid mater create

Answer 23

loose brain covering over the surface of the cerebrum

Question 24

subdural space

Answer 24

separates the dura mater from the arachnoid mater

narrow serous cavity

Question 25

subarachnoid space

Answer 25

beneath arachnoid membrane

wide

Question 26

what is the arachnoid mater composed of

Answer 26

single layer of flattened fibroblasts that form an epithelial sheath

Question 27

arachnoid trabeculae

Answer 27

from the sheath

extend toward and attach to the external surface of pia mater

Question 28

what is the subarachnoid space filled with

Answer 28

CSF

contains the largest blood vessels serving the brain
–> poorly protected

Question 29

arachnoid villi

Answer 29

protrude through the overlying dura mater and into the dural sinuses overlying the superior aspect of the brain

Question 30

where is CSF absorbed into

Answer 30

venous blood sinuses through valvelike villi

Question 31

cisterns

Answer 31

when the subarachnoid space widens in a few areas to form larger CSF compartments

Question 32

the subarachnoid space is in b/w

Answer 32

arachnoid mater and pia mater

Question 33

arachnoid granulations

Answer 33

transports CSF manufactured by choroid plexuses of the ventricles of the brain into the vascular system

Question 34

pia mater

Answer 34

delicate connective tissue

richly invested with tiny blood vessels

Question 35

what is special about the pia mater

Answer 35

only membrane that clings tightly to the brain following its every convolution

Question 36

meningitis

Answer 36

inflammation of the meningeal layers

Question 37

what causes meningitis

Answer 37

bacterial or viral infection

can spread to the underlying nerve tissue

Question 38

encephalitis

Answer 38

brain inflammation