2 The nervous system

2 The nervous system - The nervous system coordinates...

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Unformatted text preview: The nervous system coordinates many other systems The nervous system is divided into two regions: the central nervous system (the brain and spinal cord) and the peripheral nervous system (all of the nervous system outside of the CNS. Central nervous system (CNS) Peripheral nervous system (PNS) Brain Cranial nerves Spinal cord Ganglia outside CNS Spinal nerves Fig. 49-4 [email protected] moves through the nervous system from sensory neurons to processing neurons and then to motor neurons, which control muscles. Sensory input [email protected] Sensor Motor output Effector Peripheral nervous system (PNS) Fig. 48-3 Central nervous system (CNS) The patellar tendon reflex In the next several lectures we’ll consider the physiology that produces this reflex. 1. Signal conduc-on along an axon (ac-on poten-als). 2. Excitatory synap-c transmission 4. Sensory recep-on 3. Inhibitory synap-c transmission Fig. 49-3 Sensory neuron Motor neuron Interneuron Dendrites [email protected] Nucleus Cell body Axon hillock [email protected] cell These two neurons illustrate neuronal structure and introduce the major mechanism by which neurons transmit [email protected] through the nervous system: [email protected] transmission. Axon Synapse [email protected] terminals [email protected] cell NeurotransmiPer Fig. 48-4 The body contains many different types of neurons. They don’t all look alike, but they all operate on the same principles. They receive and transmit [email protected] based on electrical signals. Dendrites Axon Cell body [email protected] of axon Sensory neuron Interneurons Cell bodies of overlapping neurons Fig. 48-5 80 µm Motor neuron ...
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This note was uploaded on 02/18/2012 for the course BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.

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