MEDT200 Lecture Notes - Lecture 10: Bradycardia, Myelin, Peripheral Nervous System
8 Sep 2016
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Document Summary
Carry electrical messages all over the body. Sensory (afferent) nerves carry messages toward the brain. Motor (efferent) nerves carry messages away from the brain. Mixed nerves carry both sensory and motor fibers. Cranial nerves (carries impulses between the brain and head and neck) Spinal nerves (carries messages between spinal cord and chest, abdomen, and extremities) Autonomic nerves (carries impulses from central nervous system to organs) Balance sympathetic system - slow heart rate, lower blood pressure. Ganglia small nerve clusters of nerve cell bodies. Nerve cell movement: dendrite nerve cell body axon end fiber. At the fast excitatory synapses in the brain and spinal cord. At the fast inhibitory synapses in the brain. Messenger that tells a muscle to contract. In nervous system to provide perception of pleasurable effects. Opioids, nicotine, amphetamine, ethanol and cocaine increase dopamine release. Dysfunction involved in parkinson disease and schizophrenia. Act directly on the muscle cell itself. Increase heart rate and put body at high alert.
