PSY-P 101 Lecture Notes - Inhalant, Adenosine Receptor, Motor Neuron
21 Oct 2013
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Document Summary
Neurons are identified by direction of transmitted information: Sensory (direction) neurons: from sensory receptors (e. g. , in skin, eyes, nose, tongue, ears) torward the central nervous system. Motor (efferent) neurons: away from the central nervous system to muscles or glands. Interneurons all the rest, greatest number, between sensory neurons and motor neurons, mostly in the cns. Reflexes processed in spinal cord not the brain. Reflex pathway: afferent system afferent system neuron) interneuron pathway spinal cord efferent system (motor neuron) muscle contracts. Receives information: 1000s of branches, enable receiving information from many sources. Neurons do not go through cell division (no centrioles, so no mitosis) Action potential travels down the axon in a chemical chain reaction. Terminal buttons are part of the axon on the end or tip. Vesicles here release chemical neurotransmitters into the synapse (gap) Bundles of long axons make up nerves (axons may be several feet long)
