PSYC 401 Lecture Notes - Lecture 2: Bradycardia, Otto Loewi, Vagus Nerve
Document Summary
Neural network golgi golgi stains . Neural doctrine ramon y cajal gaps between neurons. Something had to be slowing down electrical conductions between neurons . Studied reflexes sensory and motor neurons. Synapse = functional connection need to have postsynaptic and postsynaptic cells. Reflex arc sensory input, motor output majority are controlled by spinal cord, some are cranial nerves. Temporal summation: repeated stimuli with a brief time have cumulative effect. Spatial summation: synaptic inputs originating from several different (separate) locations combine their effect on the neuron. Spontaneous firing rate: base-level of firing for action potential wouldn"t want for motor neurons. Elliott 1905 hormone adrenaline (epinephrine) mimics effects of sympathetic. Nervous system chemical involvement, still didn"t prove neurons released epinephrine, supported idea. Sherrington believed synaptic transmission was electrical. Acetylcholine (ach) nt for parasympathetic division of ans. Noradrenaline (norepinephrine, ne) nt for sympathetic division of ans. Synthesis of neurotransmitter (nt) smaller nts in axon terminal, larger nts in cell body.
