BIOL 261 Lecture Notes - Lecture 11: Central Nervous System, Sensory System, Peripheral Nervous System

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10 Nov 2020
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Initiates response to information: brain and spinal send motor output via nerves to effectors (muscles or glands) Cells of the nervous system: nerve: a bundle of axons outside the brain and spinal cord, cranial nerves: originate from the brain; 12 pairs. Functions of the nervous system: maintaining homeostasis. Regulate and coordinate physiology: receiving sensory input. Monitor internal and external stimuli: controlling muscles and glands, establishing and maintaining mental activity. Brain and spinal cord process sensory input and initiate responses. Subdivisions: central nervous system (cns): brain and spinal cord, peripheral nervous system (pns): sensory receptors and nerves. Sensory nervous system = afferent nervous system: motor nervous system = efferent nervous system. Sensory receptors: detect stimuli; send input along nerves. Sensory (afferent): transmits action potentials from receptors to cns: motor (efferent): transmits action potentials from cns to effectors (muscles, glands), autonomic. Somatic nervous system: from cns to skeletal muscles: voluntary; single neuron system.

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