KMS - Lecture 8 & 9 - Cranial Meninges Flashcards Preview

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Flashcards in KMS - Lecture 8 & 9 - Cranial Meninges Deck (24):
1

What are the layers, starting with cerebral cortex, of the meningeal layers?

Cortex/brain cells
Pia mater
Subarachnoid space with arachnoid trabeculae
Arachnoid
Dura layer

2

What tissue makes up pia mater?

Areolar CT

3

How are the tissues different between pia and arachnoid mater?

Arachnoid has somewhat more dense CT layer than pia - more elastic and collagen fibers

4

What forms the subarachnoid space? What are the contents?

Trabeculated deep surface of arachnoid mater
Contains CSF, cerebral aa and veins

5

What covers the brain? What dips into sulci?

Pia - covers, dips into sulci, invests vessels
Arachnoid - covers, doesn't dip into sulci except for longitudinal fissure
Dura - covers, doesn't dip into sulci - forms reflections

6

What forms cisterns?

Cisterns = areas of accumulated CSF
- formed by arachnoid mater and contours of the brain

7

What forms CSF (cerebrospinal fluid)?

Choroid plexus
- modified tuft of capillaries in the ventricles

8

How does CSF get into the sub-arachnoid space?

CSF flows through ventricles to 4th ventricle
- openings then communicate with sub-arachnoid space

9

Where is CSF reabsorbed? What structure is involved?

Into the superior sagittal sinus via arachnoid granulations

10

What tissue is the dura mater? What is it continuous with?

Dense fibrous CT layer enclosing brain
- continuous with spinal dura at foramen magnum

11

What is the periosteal layer of dura?

periosteum of cranial vault adherent to meningeal dura

12

What is the meningeal layer of dura? What do they form?

duplications of dura - prolonged between major portions of the brain
- form dural reflections

13

What meningeal layer eventually fuses with neural sheaths?

Dura mater - prolonged along cranial nerves

14

Name the 4 dural reflections.

Falx Cerebri
Tentorium Cerebelli
Falx Cerebelli
Diaphragma Sellae

15

What sinuses are in the falx cerebri?

Superior sagittal sinus
Inferior sagittal sinus

16

What are the attachments and shape of the falx cerebri?

Anterior- crista galli of ethmoid
- forms a sickle shape between hemispheres
Posterior - continuous with tentorium cerebelli at internal occipital protuberance

Follows contour of sagittal suture in its course

17

What forms a tent over the posterior cranial fossa? What separates cerebellum from posterior cranial hemispheres?

Tentorium cerebelli

18

What sinuses does the tentorium cerebelli enclose?

Transverse sinuses
Superior petrosal sinuses

19

Where does the tentorium cerebelli attach?

Anterior - ant. and post. clinoid processes of sphenoid bone
Periphery - occipital bone at grooves for transverse sinus

20

What is the tentorial notch?

Free anterior concave margin of tentorium which wraps around midbrain

21

Which dural reflection can kill you? How?

Tentorial notch on tentorium cerebelli
- can transect midbrain during rapid deceleration or loss of CSF

22

What is the span of the falx cerebelli?

Extension of dura
Runs between cerebellar hemispheres
Runs from tentorium above to occipital crest below

23

What does the falx cerebelli contain?

Occipital sinus

24

What is the diaphragma sellae? What does it cover?

Specialized portion of dura
Forms roof over hypophyseal fossa