Ch4 Meningeal Coverings

Question 1

3 layers of meningeas are : ___ ____ ___

Answer 1

Dura, Arachnoid, Pia

Question 2

What is the function of Meningeas ?

Answer 2

provide protection and structural support:

keeps brain from collapsing and cushions against movements

Meningeas are attached to the skull and so makes the brain moves with the head (otherwise would slosh and spine around like ice in glass)

Question 3

Dura matter is continuously attached except for two spaces : ____ (btw ___) and ___ (btw ___)

Answer 3

epidural space (btw dura and skull) and subdural space (btw dura and arachnoid)

Question 4

What is Dural Septum ?

Answer 4

Dural Septum is where the dura folds into the brain fissures

Question 5

There are two major dural septa: ___ (Where? ____ ) and _____ (Where? ___ )

Answer 5

flax cerebra (dura sheet in between hemisphere) and tentorium cerebelli (dura sheet between cerebellum and cerebellum)

Question 6

tentorium cerebelli has two compartments: What and Where ?

Answer 6

supratentorium (cerebrum) and infratentoriem (cerebellum and brainstem)

Question 7

____ is where the two layers of dura separated.

Answer 7

Dural Venous Sinuses

Question 8

What are the three major sinuses and where ?

Answer 8

• superior sagittal sinus (attached to flax)
• transverse sinus (L & R) runs along cerebellum
• sigmoidal sinus (L & R) continous part of transverse going along cerebrum.

Question 9

What are the two sensory endings in Dura matter ?

Answer 9

Dura has sensory endings : the trigeminal nerve and the vagus nerve (receved in posterior fossa)

Question 10

Answer 10

Question 11

Answer 11

Question 12

What do call the connective tissue between dura and arachnoid?

Answer 12

arachiod trabeculae

Question 13

______ = where the arachnoid space becomes wide, and where arachnoid bridges over small sulci and large surface irregularities

Answer 13

subarachnoid cisterns

Question 14

Two popular cisterns are _____ and _____

Answer 14

cisterna magna (btw cerebellum and medulla) and ambient cistern (superior cistern)

Question 15

The arachnoid have villi, the large ones are called ________

Answer 15

arachnoid granulations

Question 16

what is the function of villi ? describe the one-way strategy in villis

Answer 16

villi are major sites for reabsorption of CSF into venous system..

one-way valves that let CSF out of arachnid into the sinuses and absorbed into the venous blood.

Question 17

Answer 17

Question 18

Space around blood vessels and brain is called __________

Answer 18

perivascular space or Volchow-Robin spaces.

Question 19

What is the difference between meningeas in brain and spinal chord ?

Answer 19

• Dura : instead of 2 layers, spinal cord has one layer suspended in CSF on both sides (the outside of the spinal cord is dura)
• subarachnoid space around spinal cord just like around brain, where CSF circulates.
• Arachnoid attached to pia by connective tissue, but in spinal cord called denticulate ligaments (look like teeth) [lumbar cistern?]

Question 20

_______ = Meningeal arteries bwtween skull and dura can get torn and cause a bleed

Answer 20

Epidural Hematoma

Question 21

_____= Veins that enter the sinuses can also get torn.

Answer 21

subdural Hematoma