Neurobiology 3 Flashcards
1
Q
meninges
A
- 3 layers surround brain
- dura mater (outside)
- arachnoid (inside)
- pia mater (innermost)
2
Q
dura mater
A
- “tough mother”
- also called pachymeninges because composed 2 layers of dense fibrous tissue, fused in some areas, in some areas separated and enclose venous sinuses
3
Q
leptomeninges
A
- “light membranes” - thinner and more delicate
- arachnoid mater (spider web like)
- pia mater “tender mother”
4
Q
epidural space
A
- between bone and dura
- not present in brain but is potential space
- in spine contains fat
5
Q
subdural space
A
- potential space usually not there, can fill with blood in injury
6
Q
subarachnoid space
A
- between arachnoid and pia mater
- filled with CSF and blood vessels
7
Q
what are the 3 vessels that lead to circle of willis?
A
- basilar a.
- right internal carotid a.
- left internal carotid a.
8
Q
venous drainage
A
- small veins drain into larger venus plexuses often found in folds of dura, these then drain into internal jugular veins and eventually vena cava
9
Q
blood flow to spinal cord
A
- dorsal spinal artery supplies dorsal white and gray
- ventral spinal artery supplies white and gray matter
10
Q
venous drainage from spinal cord
A
- 2 major veins - dorsal and ventral spinal veins
11
Q
function of blood brain barrier
A
- protect the neural tissue from pathogens and toxins in the bloodstream
12
Q
components of blood brain barrier
A
- endothelial cells with tight junctions
- astrocytes
- pericytes - contractile cells, surround capillaries
- basement membrane - a layer of fluid surrounding endothelial cells
13
Q
What is at 1?
A
- lateral ventricles (1 and 2)
- within cerebral hemispheres
- divided by membrane (septum pellucidum)
14
Q
What membrane separates left and right lateral ventricles?
A
septum pellucidum
15
Q
What is at 3?
A
- third ventricle
- associated with diencephalon
- donut around intrathalamic adhesion
16
Q
What is at 4?
A
- cerebral or mesencephalic aqueduct
- connects 3rd to 4th ventricle
- common sit of obstruction
17
Q
What is at 5?
A
- fourth ventricle
- associated with metencephalon/myelencephalon
- connects aqueduct to central canal
- lateral and medial openings into subarachnoid space
