Neuroanatomy 4

Question 1

These are known as protective coverings for the brain.

Answer 1

Meninges

Question 2

What are the three layers of the brain?

Answer 2

Dura mater = outer layer
Arachnoid = middle layer
Pia mater = innermost layer (follows the gyrus of the brain - or the crevices of the brain)

Question 3

What are the 5 features of the dura mater?

Answer 3

DIdSO

• dense and fibrous
• has two layers
• inner layer forms dural folds
• sinus / venous sinus in between both layers
• outer layer

Question 4

What is the function of the dural folds?

Answer 4

Separate major divisions of the brain.

Provide stability of brain. So that divisions don’t crash against each other.

Question 5

What are the 3 dural folds?

Answer 5

Falx cerebri
Falx cerebella
Tenorium cerebelli

Question 6

This dural fold separates cerebral hemispheres.

Answer 6

Falx cerebri

Question 7

This dural fold separates the cerebellar hemispheres

Answer 7

Falx cerebelli

Question 8

This dural fold separates the cerebrum from the cerebellum

Answer 8

Tentorium cerebelli

Question 9

What are the 2 functions of the venous sinus?

Answer 9

• collect blood from the brain
• collect old CSF

Question 10

This is the layer beneath the dura mater.

• it contains blood vessels

Answer 10

Arachnoid layer

Question 11

What are the 2 special features of the arachnoid layer? (2 extra layers)

Answer 11

Subarachnoid space

Arachnoid granulations

Question 12

This is the space between the arachnoid and the Pia mater (innermost layer). And is filled with cerebrospinal fluid.

Answer 12

Subarachnoid space

Question 13

This transports old CSF from subarachnoid space into venous sinus.

Answer 13

Arachnoid granulations

Question 14

This is a network of interconnected spaces within the brain.

Answer 14

The ventricular system

Question 15

What are the features of the ventricular system?

• what does it contain?
• what is it lined with?

Answer 15

• contains cerebrospinal fluid
• lined with ependymal cells which circulate CSF using cilia

Question 16

Where is CSF produced?

Answer 16

chloroid plexus

Question 17

What are the different ventricles? Where are they found?

Answer 17

Lateral ventricles = cerebrum
Third ventricle = diencephalon
Cerebral aqueduct = midbrain
Fourth ventricle = cerebellum

Question 18

Describe the circulation path of CSF.

Answer 18

start: lateral ventricle - 3rd ventricle - cerebral aqueduct - 4th ventricle - subarachnoid space - brain + spinal cord

Exit: subarachnoid granulations => venous sinus (which is in the outer layer of the dura mater)

Question 19

Describe the circulation path of CSF.