cells and tissues of nervous system

Question 1

neurones

Answer 1

structural and functional unit
excitable cells
impulses carried as action potentials

Question 2

glial cells

Answer 2

non-excitable supporting cells

much smaller than neurons

Question 3

impulse transmission is by action potential which can travel

Answer 3

• in either direction across a neuron
• in one direction fro synaptic terminals to cell body
• in one direction from cell body to synaptic terminal

Question 4

myelin sheath

Answer 4

increase conduction speed in axons

Question 5

myelin sheaths are formed by

Answer 5

schwann cells in PNS

oligodendrocytes in CNS

Question 6

satellite cells

Answer 6

surround neuronal cell bodies

Question 7

schwann cells

Answer 7

myelination

Question 8

astrocytes

Answer 8

have endfeet
surround synapses and capillaries
help in K+ buffering

Question 9

oligodendrocytes

Answer 9

myelination

Question 10

microglia

Answer 10

phagocytosis

scar tissue formation

Question 11

ependymal cells

Answer 11

line ventricles

Question 12

blood brain barrier

Answer 12

Is a protective mechanism that helps maintain a stable environment for the brain and prevents harmful amino acids & ions present in the bloodstream and blood cells from entering the brain.

Question 13

lateral ventricles

Answer 13

c shaped cavities which lie in cerebral hemispheres

Question 14

interventricular foramen

Answer 14

connects lateral verntricles to 3rd ventricle

Question 15

3rd ventricle

Answer 15

within diencephalon

Question 16

cerebral aqeuduct

Answer 16

between 3rd and 4th ventricles

Question 17

4th ventricle

Answer 17

diamond shape

lies in hindbrain (pons and medulla infront and cerebellum at back)

Question 18

meninges

Answer 18

dura mater
arachnoid mater
pia mater

Question 19

dura mater

Answer 19

tough, fibrous and has dural folds

Question 20

pia mater

Answer 20

vascularised and disp into the folds of the brain

Question 21

subdural space

Answer 21

potential space, traversed by blood vessels penetrating into the CNS

Question 22

subarachnoid space

Answer 22

contains CSF

Question 23

CSF

Answer 23

fluid insuide cavity of brain and central canal of spinal cord

Question 24

where is CSF

Answer 24

inside ventricles

between pia and arachnoid

Question 25

where is CSF formed

Answer 25

by choroid plexus in each ventricle

Question 26

where is CSF absorbed

Answer 26

by arachnoid villi into saggital sinus