HSC 3537 Lecture Notes - Lecture 7: Shingles, Cerebral Angiography, Hemiparesis
Document Summary
Nervous system: complex: 10 billion nerve cells, voluntary and involuntary functions, carries electrical messages, external and internal receptors. Nerve cells (neurons): microscopic, collected into macroscopic nerves, carry electrical messages all over the body. Sensory nerves carry messages toward the brain. Motor nerves carry messages from the brain. Mixed nerves carry both sensory and motor fibers. Autonomic nervous system: carries impulses from the central nervous system to the organs. Sympathetic nerves stimulate the body under stress: parasympathetic nerves balance the sympathetic system. Neuron = individual nerve cell: dendrite, cell nucleus, axon. Neurilemma: terminal end fibers (secrete neurotransmitters, neurotransmitters transfer impulse across synapse. Ganglia = small clusters of nerve cell bodies. Glia cells: maintain the health of the nervous system, do not transmit impulses. Help form bbb (blood brain barrier: microglia (microglial cells) Manages speech, vision, smell, movement, hearing, and thought. Integrates and monitors impulses from skin (pain) Controls body temperature, sleep, appetite, sexual desire, and emotions.
