Sense-organ neurons {afferent nerve} {afferent fiber} send to ganglia outside brain along spinal cord. Ganglia sense neurons send one axon to brain and one axon to peripheral nerve.
Axons to brain synapse on brain secondary sense neurons. Secondary sense neurons send to cerebellum or thalamus. Thalamus neurons send to neocortex. Neocortex neurons send back to thalamus and to cortex association areas. Association cortex neurons send to hippocampus and amygdala. Hippocampus and amygdala neurons send to hypothalamus.
All these cortical regions send to corpus striatum. Corpus striatum neurons send to globus pallidus. Globus pallidus neurons send to reticular formation and thalamus.
muscle
Muscle sense-cell afferent is wide axon and has one synapse, because large axons have lower thresholds.
skin
Skin afferent is fine axon with several synapses, because fine axons have higher thresholds.
Biological Sciences>Zoology>Organ>Nerve>Kinds
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0224