L21

Question 1

Function of meninges

Answer 1

Protective covering for brain

Question 2

What are the 3 layers of the meninges

Answer 2

From outer to inner:
-Dura Mater
-Arachnoid
-Pia mater
DAP

Question 3

Features of dura mater (5)

Answer 3

-Outermost layer
-Most protective (dense and fibrous
-has 2 layers (outer and inner)
-Space between forms venous sinuses
Inner layer forms dural folds

Question 4

What are the features of dural folds?

Answer 4

-formed by inner layer of dura mater
-seperate major divisions of brain
-provide stability of brain within cranium

Question 5

What are the 3 Dural Folds

Answer 5

-Falx Cerebri
-Falx Cerebelli
-Tentorium Cerebelli

Question 6

What is the Falx Cerebri

Answer 6

-Seperates cerebral hemispheres
-in median plane
-sickle shaped

Question 7

Falx cerebelli

Answer 7

-Seperates cerebellar hemispheres
-in mediane plane

Question 8

Tentorium Cerebelli

Answer 8

-Seperates the cerebrum from cerebellum
-Horizontal plane

Question 9

Name the folds

Answer 9

-Falx cerebri
-Tentorium cerebelli
-Falx cerebelli

Question 10

Features of venous sinus

Answer 10

-Located between inner and outer layer of dura mater
-Veins (areas) which collect venous blood (deoxygenated blood) and ‘old’ CSF (depleted nutrients) after ventricular circulation.

Question 11

Arachnoid

Answer 11

-Layer beneath dura mater
-spider web like appearance

Question 12

Arachnoid features

Answer 12

-does not extend into sulci of brain (valleys)
-Contains subarachnoid space and arachnoid granulations
-Contains blood vessels within the subarachnoid space

Question 13

How does the Subarachnoid space look like?

Answer 13

Like the legs which hold up a pier

Question 14

What is the subarachnoid space filled with and its function

Answer 14

Cerebrospinal fluid which when filled will act for protection against impacts

Question 15

what does the arachnoid granulations do?

Answer 15

-transports old CSF into venous sinous through the Inner layer of dura mater

Question 16

Features of Pia Mater

Answer 16

-Thin, transparent and delicate
-Blood vessels sit atop of pia mater
-Adheres to brain and follows gyri (hills) and extends into sulci (furrows)

Question 17

The spinal cord also has meninges, name them

Answer 17

-Dorsal root ganglion
-Pia mater
-Arachnoid mater
-Dura mater
-Spinous process of vertebra
The meningeal sac around the spinal cord is an extension of subarachnoid space

Question 18

What is the ventricular system?

Answer 18

-Network of interconnected ‘spaces’ (ventricles) within the brain
-Filled with CSF which provides nutrients and protection to brain
-Inside ventricles are lines with ependymal cells
-CSF is produced by Choroid plexus

Question 19

What is the ventricular system made up of?

Answer 19

-2 lateral ventricles
-Third ventricle
-Cerebral aquaduct
-Fourth ventricle
Central Canal (spinal cord)

Question 20

Name the ventricles

Answer 20

-2 lateral ventricles
-Third ventricle
-Cerebral aquaduct
-Fourth ventricle
Central Canal (spinal cord)

Question 21

Features of lateral ventricles

Answer 21

-Two of them
-One in each cerebral hemisphere

Question 22

Where is third ventricle located/associated with?

Answer 22

Located in diencephalon

Question 23

Function of cerebral aquaduct and located in?

Answer 23

-Connects 3rd and 4th ventricle
-located in midbrain

Question 24

Where is fourth ventricle located?

Answer 24

-Located at the level of the cerebellum

Question 25

Where is Central Canal? (still part of ventricular system)

Answer 25

-Within the central canal of the spinal cord

Question 26

Features of CSF

Answer 26

-Produced by choroid plexus within ventricles
-Surrounds CNS within subarachnoid space
-provides support and cushion
-transports nutrients and waste

Question 27

What is the CSF circulation path?

Answer 27

Start: -Lateral ventricle
- 3rd ventricle
-cerebral aquaduct
-4th ventricle
-subarachnoid space

Within the subarachnoid space it flows around the brain and spinal cord

Exit: through arachnoid granulations into venous sinus