Neuroscience Week 3: Meninges and CSF

Question 1

Choroid plexus is not in?

Answer 1

Frontal and occipital horns of the lateral ventricles

Question 2

Where is choroid plexus found?

Answer 2

Lateral Ventricles

• Body
• Temporal horn
• Atrium

3rd ventricle

4th ventricle

Question 3

The flow of CSF (Lateral)

Answer 3

Lateral ventricles → Foramina of Monro → 3rd ventricle → Cerebral aqueduct of Sylvius → 4th ventricle → empties to the subarachnoid space via foramen of Magendie in the midline, bilateral foramina of Lushka laterally and down the central canal

Question 4

The flow of CSF (Coronal)

Answer 4

Question 5

Where is choroid plexus found?

Answer 5

Lateral Ventricles

• Body
• Temporal horn
• Atrium

3rd ventricle

4th ventricle

Question 6

Identify

Answer 6

Question 7

Identify

Answer 7

Question 8

Identify

Answer 8

Question 9

Packymeninges comprises

Answer 9

Dura Mater

Question 10

Leptomeninges comprises

Answer 10

• Arachnoid mater
• Subarachnoid space
• Pia mater

Question 11

Packyomeningitis Etiology

Answer 11

Intracranial hypotension

Question 12

Leptomeningitis Etiology

Answer 12

Infectious meningitis (viral or bacterial)

Question 13

Cranial epidural space

Answer 13

a potential space because it tightly adheres to the skull

Question 14

Spinal epidural space

Answer 14

• Is an actual dural space which separates the vertebral column form the dura mater internally
• As a result, the spinal epidural space carries a potential for infection, hemorrhage, spread of neoplastic diseases (higher risk than cranial)

Question 15

Middle meningeal artery

Answer 15

• runs between the skull and dura
• this epidural hematoma classically occurs from a skull fracture and middle meningeal rupture

Question 16

Key cause of subdural hematoma

Answer 16

• Bridging vein brain surface to sinus
• can easily be torn in the subdural space and cause subdural hematoma

Question 17

Dural venous channels are mostly filled with?

Answer 17

Blood because blood flow is quicker than CSF production and reabsorption is far slower (20mL/hour)

Question 18

arachnoid granulations

Answer 18

arachnoid villi drain from arachnoid space into venous sinuses

Question 19

Neoplastic Arachnoid Villi form

Answer 19

meningiomas

Question 20

Meningiomas are most commonly found

Answer 20

typically found where there is the greatest concentration of arachnoid villi at the cerebral convexity at falx cerebri at the base of the skull

Question 21

Dura matter sublayers

Answer 21

Under Skull

periosteal sublayer (vascular)

meningeal sublayer (avascular)

dural border cell sublayer (fills the subdural space)

Closest to Arachnoid Mater

Question 22

What type of hemorrhage occurs in between the dura mater and the arachnoid mater?

Answer 22

Subdural hematoma - via tearing of bridging veins

Question 23

What type of hemorrhage occurs external to the dura?

Answer 23

Intracranial epidural hematomas are classically caused when the middle meningeal artery rupture rips the dura away from the skull