PS262 Chapter Notes - Chapter 2: Edgar Adrian, Axon, Neuron Doctrine
Document Summary
Early hypotheses about the seat of the brain. Heart was seat of the mind and soul. Galen - saw human health, thoughts and emotions as being determined by four different spirits flowing fro the ventricles. 1630s - philosopher decartes specified the pineal gland - thought to be located over the ventricles, as the seat of the soul. The brain as the seat of the mind. Different functions were located in different regions of the brain. Disorders of the brain were disorders of chemistry. 1800s - two opposing ideas about the nervous system. 1. reticular theory - nervous system consisted of large network of fused nerve cells. 2. neuron theory - nervous system consisted of distinct elements or cells. Staining - chemical technique that caused nerve cells to become coloured so they stood out from surrounding tissue. Only a few cells were strained - so it was useful. Johannes mueller 1842 - doctrine of specific nerve energies.
