Session 2 - Meningeal Layers, Dural Folds amd Dural Venous Sinuses Flashcards Preview

Head, Neck and Neuroanatomy > Session 2 - Meningeal Layers, Dural Folds amd Dural Venous Sinuses > Flashcards

Flashcards in Session 2 - Meningeal Layers, Dural Folds amd Dural Venous Sinuses Deck (16):
1

What are the meninges? Name the layers.

3 membranous layers that surround and protect the brain.

Dura - tough fibrous membrane
Arachnoid - soft translucent membrane
Pia - microscopically thin, delicate, closely adherent to the surface of the brain

2

What are the two layers of the dura?

Periosteal - periosteum lining inner table of the skull
Meningeal - layer adjacent to the arachnoid

3

What are the two dural folds?

Falx cerebri
Tentorium cerebelli

4

The falx cerebri attaches to what structure anteriorly?

Crista galli

5

What is the purpose of dural folds?

Help to stabilise the brain
Act as rigid dividers

6

In some cases, a rise in intracranial pressure (e.g. secondary to a bleed) can lead to compression of the brain and therefore herniation through which foramen?

Foramen magnum

7

What are dural venous sinuses?

Venous blood filled channels created by separation of the meningeal layer from the periosteal layer of dura.

8

Dural venous sinuses will eventually drain into what vein?

Internal jugular vein

9

What are bridging veins?

Veins that pass from the subarachnoid space to dural venous sinuses, passing through the subdural space.

10

Damage to bridging veins is normally responsible for what sort of haemorrhage?

Subdural haemorrhage

11

Where does bleeding occur in the following types of haemorrhage; extradural, subdural, subarachnoid, intracerebral.

Extradural - between the periosteal layer of dura and the bone
Subdural - between the meningeal layer of dura and the arachnoid layer
Subarachnoid - between the arachnoid and pia
Intracerebral - within the brain tissue itself

12

Would an extradural haemorrhage be a venous or arterial bleed?

Arterial bleed

13

Would a subdural haemorrhage be a venous or arterial bleed?

Venous bleed

14

Would a subarachnoid haemorrhage be a venous or arterial bleed?

Arterial bleed

15

Why can lumbar punctures be useful in diagnosing a subarachnoid haemorrhage?

In a subarachnoid haemorrhage blood leaks into the subarachnoid space, mixing with cerebrospinal fluid. A lumbar puncture samples the CSF so can identify the presence of blood.

16

How would an infection around the orbit spread intracranially?

Pass through the opthalmic veins which communicate with the cavernous sinus (through the back of the orbit).