Anatomy CSF spaces and ventricles

Question 1

What ventricles are formed from the Forebrain, Midbrain and Hindbrain vessicles?

Answer 1

Forebrain - lateral and third ventricles
Midbrain vessicle - Cerebral aqueduct
Hindbrain vessicle - 4th ventricle

Question 2

Name the Foramina of the ventricles

Answer 2

Monro
Magendie (Midline aperture 4th ventricle)
Luschka (Lateral aperture 4th ventricle )

Question 3

How is tela choroidea formed?

Answer 3

During 2nd gestational month midline meningeal mesenchyme forms invagination in the ventricular system to form the tela choroidea

Question 4

What is the name of the confuencle of the horns of the lateral ventricles

How many horns do the lateral ventricles have ?

Answer 4

Atria

3 horns (anterior/frontal,occipital, temporal)

Question 5

Structures in the borders of the 3rd ventricle

Answer 5

Mammillary bodies, tuber cinereum, infundibular recess, supra-optic recess, lamina terminalis, anterior commissure,interthalamic adhesion, suprapineal recess pineal recess, aqueduct.

Question 6

Name the cisterns

Answer 6

Suprasellar
Interpeduncular, quadrigeminal, ambient = perimesencephalic cistern
Prepontine and cerebellopontine angle
Premedullary and cerebellomedullary
Cisternal Magna

Question 7

What is the Choroid plexus?

What is glomera?

Answer 7

Highly vascularised structure
Ependymal lining around connective tissue
Secretes CSF and maintains BBB

focal thickening of the choroid plexus in atria

Question 8

Which structure is at the beginning of the spinal canal?

What is the biggest cistern in humans?

Answer 8

Obex

Lumbar

Question 9

Upt to which age can we see a terminal ventricle

Answer 9

<5 y

Question 10

What is the cavum septi pellucidi?

Answer 10

Failed fusion of the embryological septa pelludica which forms around 3rd month of gestation and fuses close to birth. Normal splenium.

Question 11

What is a cavum veli interpositi?

Answer 11

Double fold of pia-arachnoid meninges extending from fornices to roof of third ventricle. Δ shape posteriorly

Question 12

What two anatomic variants are seen posteriorly?

Answer 12

Cavum vergae (rare) and cavum veli interpositi

Question 13

What is the difference between Mega Cisterna Magna and Blake’s pouch cyst?

Answer 13

MCM = enlargement of the subarachnoid space without cyst formation
If cyst with wall then it is a Blake’s pouch cyst

Question 14

What is the Benign Enlargement of the subarachnoid spaces in infancy? (BESS or BESSI)

Answer 14

Usually around frontal lobes
Males >females
Macrocephaly or frontal bossing
Usually disappears by age of 2
DDx subdural (cortical vein sign)

Question 15

What is ependymitis granularis ?

Answer 15

• Symmetrical triangular T2/FLAIR hyperintensity at anterior and lateral sides of frontal horns
• <1cm
• No signal change on T1WI

Question 16

What is a Choroid Plexus Xanthogranuloma ?

Answer 16

Myxoid cyst
Usually at glomera/atria
Usually <1cm
Restricted diffisuon
Rim of Calcification

Question 17

What are the types of spinal meningeal cysts?

Answer 17

Type I: Extradural meningeal cyst without neural tissue
Ia : extradural spinal arachnoid cyst
Ib: sacral meningocele
Type II: Extradural arachnoid cyst containing neural tissue (Tarlov)
Type III: Intradural spinal arachnoid cyst.

Question 18

What is the most frequest location for spinal extra- or intradural arachnoid cysts? Do they cause symptoms?

Answer 18

Thoracic level

Mostly asymptomatic

Question 19

What is the differential for type III intradural spinal arachnoid cyst?

Answer 19

cord herniation, (epi)dermoid cyst, infectious

Question 20

Is choroid plexus seen in the aqueduct?

Where do you get choroid plexus in the third ventricle?

Answer 20

No

In the roof of the third ventricle