1. what are the two components of the central
nervous system?
what is the role of the
CNS?
brain and spinal cord
process sensory input and generate motor output
2. what are the components for the peripheral
nervous system?
what is the role?
peripheral nerves, cranial nerves(12 pairs) and
spinal nerves(31 pairs)
afferent sensory communication with CNS
efferent motor output from CNS
3. afferent vs efferent
nerves
afferent- takes signals from peripheral tissue to
CNS
efferent- takes signals from CNS to peripheral tissue
4. neurones
carry signals as nerve impulses or action potential
high metabolic rate= constantly need o2 and glucose
have extreme longetivity
once formed and functioning, lose ability to divide
5. components of a neuron- dendrites
receive signal inputs and gets converted into membrane voltage
6. components of a neuron-soma
cell body
mitochondria and golgi
microtubules and neurofilaments
gathers all inputs from dendrites
transferred to axon hillock
7. components of neuron- if enough stimulation reached throughout the body,
axon hillock
it produces an action potential
expresses ion channels needed for action potential
8. components of neuron-axon
allows action potential to go towards target
allow for transport of molecules to nerve terminals
size can vary in diameter, reflects conduction
speed
1/4 9. myelin
axons are covered by myelin sheath
myelinating cells- Schwann cells and oligodendrocytes
initially, they're loose, over time cytoplasm
squeezed out making them tight
cytoplasmic free membrane= good electric insulator
saltatory conduction- nodes of Ranvier(gaps)
cause action potential to jump from one node to
another
10. switching off a synapse neurotransmitter can be removed by the synaptic
cleft by neurotransmitter break down or neurotransmitter uptake
11. types of neurons- func- sensory(afferent) neurons
tional clasification
motor(efferent) neurons
interneurons(neurons that connect sensory and
motor)
12. types of neurons- mor- pseudo-unipolar neurons: only axons and no denphological classifica- drites(sensory)
tion
bipolar neurons- 1 axon and 1 dendrite(olfactory,
retina)
multipolar neurons-many dendrite(motor neurons)
13. transport through the
plasma membrane
hydrophilic substances cannot pass the plasma
membrane due to phospholipid bilayer
need transporter proteins
14. types of transport
through plasma membrane
in terms of number of molecules transported:
uniport-one molecule
cotransport- one solute
symport- one direction
antiport- opposite direction
in terms of energy requirements:
passive transport- molecules moving according to
conc gradients
active transport- molecules moving against conc
gradient
2/4 primary- sodium potassium pump
secondary- sodium-glucose pump
15. at rest membrane po- membranes electrically charged- polarized
tential in excitable cells positive charge on outside and negative charge on
outside
16. voltage operated sodi- local anaesthetics(lidocaine) block Na+ ion chanum ion channels role
nels
nerve conduction
so many Na+ in channels are inactive that an action
potential cannot be sustained or generated
17. cells of the nervous
system- Glia
meaning 'glue'
maintain environment around neurons
have an important role in myelinating cells
schwann cells and satellite glial cells
18. three layers of produra mater(thick and tough)
tective cover surround- arachnoid mater(web like)
ing brain and spinal
pia mater(thin membrane held tightly to cortex)
cord(meninges)
19. Anatomy of the brainforebrain
cerebral cortex- cerebrum
consciousness, thinking and motor skills
2 hemispheres by corpus callosm
20. Anatomy of the brainbrainstem
midbrain-hearing and movement
pons- tear production, chewing, blinking
medulla oblongata- heart rate, breathing, blood
flow
21. Anatomy of the
brain-limbic system
thalamus- relays sensory info to CNS
hypothalamus-regulates pituitary gland
amygdala- regulates emotions
hippocampus- memory forming, connects memories with senses
22. anatomy of the brain- pi- posterior to bridge of nose
tuitary gland
link between nervous and endocrine system
3/4 releases many hormones that control growth metabolism and reproductive system
23. anatomy of the braincerebellum
'little brain'
coordinates motor movements, maintains balance
24. anatomy of the CNSgrey and white matter
grey matter- formed by cell body(soma)
white matter- axons wrapped in myelin sheath
4/4
The Nervous System
of 4
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