Nervous systems

Nervous systems - Nervous Systems Nerve cells = neurons...

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Nervous Systems - Nerve cells = neurons - fMRI – uses measurements of blood flow in brain to create a map of brain activity - Certain groups of neurons function in specialized tasks in the brain - All animals except sponges have nervous system o Cnidarians Nerve nets control contraction/expansion of gastrovascular cavity o Echinoderms Nerve net in each arm, connected by radial nerves to a central nerve ring o Flatworms Small brain and longitudinal nerve cords – rudimentary CNS o Annelids More complex brains and ventral nerve cords, segmental ganglia create PNS o Vertebrates CNS – brain and spinal cord PNS – nerves and ganglia - Information Processing o Three stages of information processing Sensory input Sensory neurons detect external stimuli or internal conditions Integration Interneurons analyze and interpret sensory input Motor output Motor neurons communicate with effector cells (muscle or endocrine cells) o Reflexes = body’s automatic responses to stimuli
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Nervous systems - Nervous Systems Nerve cells = neurons...

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