Lecture 6

Question 1

What is Meniges

Answer 1

Protective covering for the brain

Question 2

What are the three layers of meninges for the brain (also the spinal cord)

Answer 2

Dura mater
arachnoid
Pia Mater

Question 3

What is Dura Mater

Answer 3

The outer layer of meninges 
Dense and Fibrous - toughness
2 layers - outer, inner
space between layers forms - venous sinuses 
the inner layer forms dural folds

Question 4

What is the Function of Dural Folds

Answer 4

separate major divisions of the brain, Provide stability of brain within cranium

Question 5

What are the 3 special features of the brain

Answer 5

1. falx cerebri
   - seperates cerebral hemisphere
   - median plane
2. falx cerebri
   - seperates cerebellar hemispheres
   - median plane
3. tentorium cerebello
   - seperates cerebrum from the cerebellum
   - horizontal plane

Question 6

What is Venous sinus

Answer 6

collecting veins for:

• venous blood from the brain
• Old CSF after it has cycled through the ventricular system

Question 7

What is Arachnoid Mater

Answer 7

spider like 
-does not extend into suci
contains blood vessels 
2 special features 
- subarachnoid space 
-Arachnoid granulations

Question 8

What is subarachnoid space

Answer 8

• between the arachnoid and pia mater

- filled with Cerebrospinal Fluid (CSF)

Question 9

What are Arachnoid granulations

Answer 9

Perforate the inner layer of Dura Mater

Transport old CSF from subarachnoid space into venus sinus

Question 10

What is Pia Mater

Answer 10

inner layer of the meninges
transparent and delicate
blood vessels of arachnoid sit on top of pia mater
adheres to brain and follows gyri and extends into sulci

Question 11

What is the Ventricular system

Answer 11

Network of interconnected spaces/ventricles within the brain

Question 12

What is the function of the Ventricular system

Answer 12

• filled with CSF, nourishes and protects the brain
• lined with ependymal cells, circulate CSF
• CSF produced by choroid plexus

Question 13

What is Cerebrospinal fluid (CSF)

Answer 13

• Surrounds the CNS
• provides support and cushion
• transports nutrients and waste

Question 14

What produces CSF

Answer 14

produced by choroid plexus within the ventricles

Question 15

How does CSF circulate

Answer 15

starts in the lateral ventricle
-3rd ventricle
-cerebral aqueduct
-4th ventricle
-subarachnoid space- flows around brain and spinal cord
Exit, Through arachnoid granulations into venous sinus