Meninges

Question 1

List the 3 meninges from superficial to deep

Answer 1

dura mater
arachnoid
pia mater

Question 2

The subarachnoid space is in between ____ and _____

Answer 2

arachnoid
pia mater

Question 3

What is the dura mater also called?

Answer 3

pachymenix

Question 4

T/F: There is epidural space in between the dura mater and arachnoid

Answer 4

FALSE - epidural space is only EXTERNAL to the dura mater!

Question 5

The _____ is a space between the pia mater and arachnoid.

Answer 5

subarachnoid space

Question 6

Define epidural space. It is [cranial/caudal]

Answer 6

external to dura mater
cranial dura fused to periosteum

Question 7

Within the vertebral canal, what is separated that leaves a fat-filled epidural space? Just deep to what?

Answer 7

dura mater &
periosteum
yellow ligament

Question 8

The fat-filled epidural space is just deep to the _______

Answer 8

yellow ligament

Question 9

Where does the falx cerebri extend? It is part of the [dura mater/arachnoid/pia mater]

Answer 9

extends into the longitudinal cerebral fissure (between cerebral hemispheres)
dura mater

Question 10

What does the falx cerebri contain?

Answer 10

dorsal sagittal sinus

Question 11

Label the diagram 1-4

Answer 11

1. dura mater
2. falx cerebri
3. corpus collusum (has commissural fibers)
4. longitudinal cerebral fissure

Question 12

What is this?

Answer 12

tentorium cerebelli

Question 13

Where does the tentorium cerebelli extend?

Answer 13

extends into the transverse cerebral fissure (between cerebral hemispheres and cerebellum)

Question 14

Label 1 & 2

Answer 14

1. tentorium cerebelli
2. tentorial process

Question 15

What is one structure that collects blood from the brain? Name the structure it is within.

Answer 15

dorsal sagittal sinus
falx cerebri

Question 16

The _______ contains cerebrospinal fluid (CSF)

Answer 16

subarachnoid space

Question 17

Define the arachnoid. What does it contain?

Answer 17

lines deep surface of dura mater
contains arachnoid trabeculae which traverse the subarachnoid space

Question 18

Define pia mater. Where does it extend?

Answer 18

intimately attached to the surface of the CNS
extends into depths of sulci, fissures, crevices, etc

Question 19

Name two subarachnoid cisterns / enlargements

Answer 19

cerebellomedullary cistern (cisterna magna - bc close to foramen magnum)
lumbar cistern

Question 20

Define myelography.

Answer 20

injection of contrast into the subarachnoid space

Question 21

List 2 other meningeal structures

Answer 21

denticulate ligaments
filum terminale

Question 22

Define denticulate ligaments. What does it stabilize?

Answer 22

thickened longitudinal cord of pia on lateral margin of spinal cord
segmentally attaches to the dura & arachnoid
thus suspends the spinal cord & stabilizes it

Question 23

Define filum terminale

Answer 23

narrow cord of meninges that attaches conus medullaris (end of the spinal cord) to the caudal vertebrae

Question 24

What is the choroid plexus? It is present within each _____ and has a function of ________

Answer 24

compact mass of pia, capillaries, and ependymal epithelium
ventricle
producing csf by secretion and ultrafiltration

Question 25

What is ependymal epithelium?

Answer 25

lines the ventricles inside

Question 26

Trace CSF flow

Answer 26

• choroid plexus
• ↓
• lateral ventricle
• ↓
• interventricular foramen
• ↓
• third ventricle
• ↓
• mesencephalic aqueduct
• ↓
• fourth ventricle (contains rhomboid fossa)
• ↓
• lateral apertures OR central canal
• if to lateral apertures…
• ↓
• subarachnoid space
• ↓
• arachnoid villi
• ↓
• venous sinus (dorsal sagittal sinus)

Question 27

What does arachnoid villi function to do?

Answer 27

filter CSF into venous system

Question 28

Where is CSF drained?

Answer 28

subarachnoid space via arachnoid sinus to the venous sinuses

Question 29

Define hydrocephalus. There is usually a problem with what structure?

Answer 29

high pressure of CSF in subarachnoid space
not draining
problem usually with mesencephalic aqueduct