Nerves - brain Flashcards Preview

Medicine Term One > Nerves - brain > Flashcards

Flashcards in Nerves - brain Deck (23):
1

What makes up the brain stem

midbrain - high level functions
pons
medulla oblongata - vital involuntary functions

2

What is the four cerebrum lobes

frontal lobe - thoughts and feeling
temporal lobe - language and auditory
parietal lobe - sensation an touch
occipital lobe - visual

3

How many pairs of spinal nerves are there

31

4

How many cervical, thoracic, lumbar, sacral, coccygeal

8 cervical
12 thoracic
5 lumbar
5 sacral
1 coccygeal

5

What are the three types of neurons related to the CNS

afferent neurone
efferent neurone
interneurons

6

What are the different gial cells in the CNS and their functions

Astrocytes -maintain the external environment for the neurones and surround blood vessels & produce the blood brain barrier
Oligodendrocytes - form myelin sheaths in the CNS
Microglia - immunity
ependymal cells - produce CBF

7

what are the gial cells in the PNS

Schwann cells - form myelin sheath
Satellite cells - support

8

Name three different types of potentials

RMP
graded
AP

9

What is a gyrus

a ridge or fold between two clefts on the cerebral surface in the brain

10

what is a sulcus

a groove or furrow, especially one on the surface of the brain

11

What does cerebellum regulate

muscular activity

12

What is the function of the corpus callous

joins the two hemispheres, helping in communication

13

What is the purpose of the RMP

keep cells ready to respond

14

what is an indirect cause of RMP

NA/K pump

15

What causes RMP

leaky K

16

What is the equilibrium constant

the membrane potential at which the electrical gradient is exactly equal and opposite to the concentration gradient

17

What does the Nernst equation predict

the equilibrium potential for a single ion species

18

What protects the brain from K changes

blood brain barrier

19

What is the normal RMP

-70mV

20

What causes the tight blood brain barrier

Due to astrocytes & tight junctions between endothelial cells

21

Why is RMP -70mV and not theoretically -90mV

due to other leaky channels between Na and Cl

22

When is depolorisation, repolarisation, hyperpolorisation

d- when cells become positive
r - when cells return make to RMP
h- cells go below RMP e.g. -90mV

23

What is refractory period

cells is at rest and unresponsive to stimuli