BIOL 2021 Lecture Notes - Lecture 10: Defecation, Arrector Pili Muscle, Periaqueductal Gray

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Chapter 14 & 15: peripheral and autonomic nervous systems. Nervous structures outside the brain and spinal cord: provides vital links between the body and the outside world, nerves allow the cns to receive information and take action. Functional components of the pns: sensory input and motor outputs, categorized as somatic or visceral, sensory inputs also classified as general or special. Autonomic nervous system general visceral motor part of the pns: two divisions: parasympathetic and sympathetic. Classification of sensory receptors by location: exteroreceptors sensitive to stimuli arising from outside the body. Include receptors for touch, pressure, pain, temp: interoreceptors receive stimuli from internal viscera. Activation causes us to feel visceral pain, nausea, hunger, fullness: proprioceptors monitor degree of stretch. Spinal nerves: 31 pairs, contain thousands of neurons, connect to the spinal cord, named for the point of issue from the spinal cord, design is like a tree. Spinal nerves arise from the spinal cord as a series of tiny rootlets.

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