PHYS20008 Lecture Notes - Lecture 6: Excitatory Synapse, Brainstem, Diencephalon
8 May 2019
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Hypothalamus is the lower half of these. It is positioned in between the stem and cortex so that it can order behavioural change from the cortex and physiological autonomic. Receptor neuron (light blue) sends signal to an interneuron which sends it to the effector neuron to cause a response. It all comes back to maintaining homeostasis. Note: remember that an excitatory neurotransmitter will make the next neuron fire more ie it is the neurotransmitter that is excitatory/inhibitory not the receptor. 1 neuron branches of to many other neurons. Many neurons converge to influence a smaller number of neurons. Since one neuron cell body might have heaps of neurons telling it to either fire an ap or not to fire an ap (if they are excitatory or inhibitory) The axon hillock is loaded with voltage-gated sodium channels as this is where. We need around 20 mv to reach threshold however each excitatory neuron only gives about 2 mv.
