Meninges and Ventricular System

Question 1

What are the meninges?

Answer 1

A protective covering for the brain and spinal cord found between the cranium bone and the surface of the brain

Question 2

How many layers of the meninges are there?

Answer 2

3

Question 3

What are the 3 layers of the meninges?

Answer 3

Dura mater, arachnoid and pia mater

Question 4

What is the dura mater?

Answer 4

The outer most layer of the meninges

Question 5

How would the dura mater be described?

Answer 5

Dense and fibrous-tough

Question 6

How many layers are there in the dura mater?

Answer 6

2- outer and inner

Question 7

What is the space between the two dura mater layers?

Answer 7

The venous sinuses which are only found in some places

Question 8

What does the inner layer of the dura mater form?

Answer 8

Dural olds

Question 9

What is the dura mater important for?

Answer 9

If the cranium fractures and preventing bone shards from penetrating the brain

Question 10

What are the dural folds formed from?

Answer 10

The inner layer of the dura mater

Question 11

What do the dural folds do?

Answer 11

Separate the major divisions of the brain and provide stability of the brain within the cranium

Question 12

What are the 3 dural folds?

Answer 12

Falx cerebri, falx cerebelli and tentorium cerebelli

Question 13

What does the falx cerebri do?

Answer 13

Separate the cerebral hemispheres

Question 14

What plane is the falx cerebri in?

Answer 14

The median plane

Question 15

What does the falx cerebelli do?

Answer 15

Separate the cerebellar hemispheres

Question 16

What plane is the falx cerebelli in?

Answer 16

The median plane

Question 17

What does the tentorium cerebelli do?

Answer 17

Separate the cerebrum from the cerebelli

Question 18

What plane is the tentorium cerebelli in?

Answer 18

The horizontal plane

Question 19

Where is the venous sinus located?

Answer 19

Where the two layers of the dura mater separate?

Question 20

What is the function of venous sinus?

Answer 20

To collect veins

Question 21

What two things does the venous sinus collect?

Answer 21

Venous blood from the brain and ‘old’ CSF after it has cycled through the ventricular system

Question 22

What is the arachnoid mater?

Answer 22

The layer beneath the dura mater and above the Pia mater

Question 23

Why is the arachnoid mater named?

Answer 23

Because of its spider like appearance

Question 24

Does the arachnoid mater extend into sulci (valleys)?

Answer 24

No

Question 25

What are the two special features of the arachnoid mater?

Answer 25

Subarachnoid space and arachnoid granulations

Question 26

What is contained in the arachnoid mater?

Answer 26

Blood vessels which are within the subarachnoid space and lying onto of the Pia mater

Question 27

Where is the subarachnoid space?

Answer 27

Between the arachnoid and the Pia mater

Question 28

What is the subarachnoid space filled with?

Answer 28

Cerebrospinal fluid and contains blood vessels

Question 29

Where are then arachnoid granulations found?

Answer 29

Perforating the inner layer of the dura mater into the venous sinus

Question 30

What do the arachnoid granulations do?

Answer 30

Transport old cerebrospinal fluid which has lost its nutrients and is full of waste from the subarachnoid space into the venous sinus

Question 31

What is the Pia mater?

Answer 31

The inner layer of the meninges

Question 32

How is the Pia mater described?

Answer 32

Transparent and delicate

Question 33

What sits on top of the Pia mater?

Answer 33

Blood vessels in the arachnoid

Question 34

What does the Pia mater do?

Answer 34

Adhere to the brain and follows gyri and extends into sulci separating the smaller sections of the brain

Question 35

What is the ventricular system?

Answer 35

A network of interconnected spaces (ventricles) within the brain

Question 36

What is the ventricular system filled with?

Answer 36

Cerebrospinal fluid which nourishes and protects the brain

Question 37

What is the ventricles lined with?

Answer 37

Ependymal cells which circulate the CSF (moving cilia)

Question 38

What is the CSF produced by?

Answer 38

The choroid plexus in the ventricles

Question 39

Hoe many lateral ventricles are there?

Answer 39

2

Question 40

Where are the lateral ventricles?

Answer 40

One is found in each cerebral hemisphere

Question 41

Where is the third ventricle found?

Answer 41

In the diencephalon

Question 42

What does the cerebral aqueduct do?

Answer 42

Connect the third ventricle to the fourth

Question 43

Where is the cerebral aqueduct located?

Answer 43

In the midbrain

Question 44

Where is the fourth ventricle located?

Answer 44

At the level of the cerebellum

Question 45

What is found in the ventricular system?

Answer 45

Lateral ventricles (2), Third ventricle (1), cerebral aqueduct (1), fourth ventricle (1) and the central canal (spinal cord)

Question 46

Where is the CSF found?

Answer 46

Surrounding the CNS within the subarachnoid space

Question 47

What does the CSF do?

Answer 47

Provide support and cushion as well as transporting nutrients and waste

Question 48

Where does the path of CSF circulation start?

Answer 48

At the lateral ventricles

Question 49

What is the path of the CSF from the lateral ventricles?

Answer 49

3rd ventricle, cerebral aqueduct, 4th ventricle, subarachnoid space

Question 50

What does the CSF do within the subarachnoid space?

Answer 50

Flows around the brain and spinal cord in both directions

Question 51

Where does the CSF exit?

Answer 51

Through arachnoid granulations into the venous sinus