Meninges: Arachnoid Mater

Question 1

Arachnoid mater

Answer 1

1. Thin and delicate membrane 2. Between pia and dura maters
2. Bridges over sulci on brain surface

Question 2

Subarachnoid space

Answer 2

Space between pia and arachnoid maters

Question 3

Subarachnoid space contents

Answer 3

1.CSF
2. Brain blood vessels

Question 4

Subarachnoid space is crossed by

Answer 4

Fine fibers reticulum which connect pia and arachnoid, keeping subarachnoid space narrow

Question 5

Subarachnoid cisterns

Answer 5

In certain situations, reticulum is much reduced and both membranes are widely separated leading to subarachnoid widening

Question 6

Subarachnoid cisterns

Answer 6

1. Cerbellomedullary cistern (cisterna magna)
2. Pontine (pinto-medullary) cistern
3. Interpeduncular cistern
4. Lateral fissure cistern
5. Corpus callosum cistern
6. Chiasmatic cistern

Question 7

Cisterna magna

Answer 7

Lies in cerebellum and lower half of 4th ventricle roof high opens up into cistern by magendie median aperture for CSF drainage

Question 8

Pontine cistern

Answer 8

Lies in front of pons and medulla

Question 9

Pontine cistern contents

Answer 9

1. Vertebral artery
2. Basilar artery

Question 10

Pontine cistern is transversed by

Answer 10

Lower 8 cranial nerve roots

Question 11

Pontine cistern CSF drainage

Answer 11

4th ventricle open into it by luschka lateral apertures

Question 12

Interpeduncular cistern

Answer 12

Lies in interpeduncular fossa

Question 13

Interpeduncular cistern content

Answer 13

Arteries forming circulus arteriosus

Question 14

Interpeduncular cistern transversed by

Answer 14

3rd and 4th cranial nerve roots

Question 15

Lateral fissure cistern

Answer 15

Interpeduncular cistern extension into lateral fissure main stem

Question 16

Lateral fissure cistern contents

Answer 16

Middle cerebral artery

Question 17

Corpus callosum cistern

Answer 17

Extends along callosal sulcus on corpus callosum upper surface

Question 18

Corps callosum cistern contents

Answer 18

Anterior cerebral artery

Question 19

Chiastmatic cistern

Answer 19

Lies around optic chiasma

Question 20

Cisterns communication

Answer 20

Communicate freely with each other

Question 21

Arachnoid villi and granulations

Answer 21

Arachnoid mater projections that push themselves inside Dural venous sinuses

Question 22

Arachnoid villi and granulations site

Answer 22

Found in large numbers especially along SSS

Question 23

Arachnoid villi and granulations age

Answer 23

Increase in size and number in old age

Question 24

Arachnoid villi and granulations functions

Answer 24

Serve as channels for CSF drainage to blood stream