General Organisation Of Nervous System

Question 1

4 neuroglial cells in CNS

Answer 1

Astrocytes
Oligodendrocytes
MicrogliA
Ependymal cells

Question 2

Astrocyte features and function

Answer 2

Most numerous
Cell bodies of astrocytes connected to blood capillary and axons of neurons
1. Maintenance of blood brain barrier
2. Microfilaments give structural strength
3. Stabilise structure after injury, by producing scar tissue
4. Direct neural growth
5. Recycle neurotransmitters-> control interstitial environment

Question 3

Microglia features and function

Answer 3

Small slender cells with fine branches
From same stem cells as macrophages/monocytes,
Rapidly increase in number during infection
Phagocytosis

Question 4

Ependymal cells features and function

Answer 4

Line passageways of CNS, branches which contact other glial cells
Monitors composition of CNS

Question 5

Oligodendrocyte features and function

Answer 5

Come into contact with axons, wrapping them tgt or in myelin-> improves conducting velocity
Provides structural framework

Question 6

2 neuroglial cells in PNS

Answer 6

Schwann and satellite

Question 7

Schwann cells features and function

Answer 7

Enclose several axons

Myelinates axons

Question 8

Satellite cell features and functions

Answer 8

Surround cb in ganglia

Regulates o2/co2/nutrient/neurotransmitters

Question 9

Dura mater features

Answer 9

2 layers: periosteal/meningeal

Sinus runs in gap

Question 10

Arachnoid mater

Answer 10

Contains subarachnoid space (collagen & elastic fibres) with CBS

Question 11

Pia mater

Answer 11

Astrocytes attach this to brain