Basic Organization of the Central Nervous System

Basic Organization of the Central Nervous System - Motor...

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Basic Organization of the Central Nervous System Characteristics of communication in the nervous system: 1. Rapid control of sensory/motor activities (perception, emotion) 2. Receives information through sensory systems and process it to determine the effector response 3. Basic unit of information processing is action potential (AP) in the entire nervous system all or nothing response, maximum frequency 500-1000 Hz 100 mV peak to peak amplitude of action potential, 2 ms duration 60 to 80 mV (negative) resting nervous information contained in frequency, not amplitude; firing pattern 4. Intercellular communication occurs mainly at the specialized sites: chemical synapses, electrical synapses, gap (tight) functions Three major CNS systems: Sensory system (afferent, ascending system): deliver information from receptors to CNS
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Unformatted text preview: Motor system (efferent, descending system): delivers information from CNS to muscles/glands Motivational system: stimulates interest in initiating and completing a task (limbic system) Divisions of the human nervous system: Peripheral Nervous System: outside dura mater; Schwann cells provide myelin; axons can regenerate 1. Sensory (afferent) division: • Somatic sensory neurons: signals generated from skin/skeletal muscles • Visceral sensory neurons: signals generated from automatic nervous system 2. Motor (efferent) division: • Somatic nervous system: signals to skeletal muscles • Automatic nervous system: signals to smooth/cardiac muscle/glands Central Nervous System: oglidendrocytes provide myelin; axons CANNOT regenerate 1. Brain 2. Spinal cord...
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