Neuro: Histology

Question 1

neurones

Answer 1

intercommunicating network of specialised cells. They constitute most sensory receptors, the conducting pathways and sites of integration and analysis.

function depends on excitability property. as in all cells, resting neurones maintain ionic gradient across its plasma membrane =>creating electrical potential.

excitability= change in membrane permeability in response to stimuli such that the ionic gradient is reversed and the PM is depolarised (i.e. action potential then spreads along the PM)

Repolarisation- reestablishes the resting potential

Question 2

synapse

Answer 2

sites of intercommunication between adjacent neurones

Question 3

neurontransmitter

Answer 3

depolarisation of one neutron causes it to release chemical substances, which initiate an AP in the adjacent neurone

mediate neurone-neurone transmission but also act as chemical intermediates between the nervous system and effector organs which also exhibit the property of excitability

Question 4

CNS

Answer 4

brain and Spinal cord

Question 5

PNS

Answer 5

all nervous tissue outside the CNS

sensory and autonomic ganglia

spinal nerves ( 31 pairs)
cranial nerves ( 3-12)
-> 1-3 are not TRUE CN's

Question 6

somatic neurones

Answer 6

organ to environment

Question 7

Autonomic/ vegetative system

Answer 7

homeostasis

regulates the function of organ systems