Meninges And Ventricular System

Question 1

What are the 3 layers of Meninges from superficial to deep

Answer 1

Dura Mater
Arachnoid
Pia mater

Question 2

What are the five features of Dura mater
ODTSI

Answer 2

Outer most layer
Dense and fibrous - tough
Two layers (outer/inner)
Space between layers forms venous sinuses - only in some places
Inner layer forms Dural folds

Question 3

What are dural folds

Answer 3

Formed from inner layer of dura mater
Seperate major devisions of the brain
Provide stability of the brain within cranium

Question 4

What are the 3 dural folds

Answer 4

Falx cerebri
Falx cerebelli
Tentorium cerebelli

Question 5

What is the Falx cerebri

Answer 5

Dural fold that separates the cerebral hemispheres in the median plane

Question 6

What is the Falx cerebelli

Answer 6

Dural fold that separates the cerebellar hemispheres in the median plane

Question 7

What is the Tentorium cerebelli

Answer 7

Dural fold that separates the cerebrum from the cerebellum in the horizontal (transverse) plane

Question 8

What are the 3 features of Venous sinuses

Answer 8

Located where the two layers of dura mater seperate
Collecting veins
They collect venous blood (from brain) and old cerebrospinal fluid

Question 9

What are the five features of the arachnoid layer

Answer 9

Layer beneath dura mater
Layer above the Pia mater
Does not extent into sulci (valleys)
Contains 2 features - subarachnoid space and arachnoid granulations
Contains blood vessels (within the subarachnoid space)

Question 10

What is the subarachnoid space

Answer 10

Space between the arachnoid and Pia mater
Filled with cerebrospinal fluid

Question 11

What are arachnoid granulations

Answer 11

They perforate the inner layer of dura mater
Transport “old” cerebrospinal fluid from subarachnoid space into venous sinus

Question 12

What are the 4 features of Pia mater

Answer 12

Inner layer of meninges
Transparent and delicate
Blood vessels in arachnoid sit on top of Pia mater
Adheres to brain and follows gyri and extends into sulci

Question 13

What are the 4 features of the ventricular system

Answer 13

Network of interconnected “spaces” (ventricles) within the brain
Filled with cerebrospinal fluid
Spaces lined with ependymal cells, which circulate cerebrospinal fluid with the beating of cilia
Cerebrospinal fluid is produced by the choroid plexus

Question 14

Outline the components of the ventricular system

Answer 14

Lateral ventricles
Third ventricle
Cerebral aqueduct
Fourth ventricle
Central canal (spinal cord)

Question 15

What are the features of the lateral ventricles

Answer 15

Two of them
One in each cerebral hemisphere

Question 16

What are the features of the third ventricle

Answer 16

Located in the diencephalon

Question 17

What are the features of the cerebral aqueduct

Answer 17

Connects 3rd and 4th ventricles
Located in the midbrain

Question 18

What are the features of the fourth ventricle

Answer 18

Located at the level of the cerebellum
Posterior to pons and medulla oblongata
Anterior - inferior to cerebellum

Question 19

What are the 4 features of the cerebrospinal fluid

Answer 19

Produced by the choroid plexus within the ventricles
Surrounds the CNS, within the subarachnoid space
Provides support and cushioning
Transports nutrients and waste

Question 20

What is the cerebrospinal fluid circulatory pathway

Answer 20

Start - Lateral ventricles
3rd ventricle
Cerebral aqueduct
4th ventricle
Subarachnoid space

Within subarachnoid space it flows around brain and spinal cord

Exit - through arachnoid granulations into venous sinus