Physiology 3120 Lecture Notes - Nissl Body, Motor Neuron, Retina
20 Nov 2012
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Glia (glue) neurons fully depend on glia. Also important in signalling (not only because they provide myelin), control ionic environment. Pseudounipolar neurons are rare and are sensory. Bipolar (in human retina), rare as well. 99% of neurons are interneurons" (more common is interneurons and projection neurons), inside our brain. Every neuron has only one axon but can have many dendrites. Motor neuron body sits in spinal cord (20 um in diameter). Picture is not to scale, axon is very long. Dendrites are tapered, axons are not. (6) Axon hillock is lighter stained then soma (7) Axo-somatic (axon makes synapse on soma), axo-dendritic (most common) (usually on small pertrusions), axo-axonic (synapse to synapse). Easily identifiable in em because of vesicles. (8) snares guide (nsf not involved). Get rid of neurotransmitter by either reuptake or degradation. One area where drugs are often targeted. Depression (not enough serotonin so give ssris that inhibit the reuptake of serotonin)
