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IPHY 3410, Section 100 VOCABULARY Spring, 2009 Lecture Date Topic L21 Peripheral and autonomic nervous system I Tues 4/7 LOWRY Reading in Marieb, Mallatt, and Wilhelm Ch. 14, pp. 426-454; Ch. 15, pp. 459-474 Peripheral nervous system (PNS) somatic nervous system visceral nervous system visceral sensory visceral motor parasympathetic nervous system sympathetic nervous system Peripheral sensory receptors free nerve endings of sensory neurons complete receptor cells Classification by location exteroceptors touch pressure pain temperature most receptors of special sense organs interoceptors (visceroceptors) chemical concentration taste stimuli stretching of tissues temperature proprioceptors musculoskeletal organs (skeletal muscles, tendons, joints, ligaments) Classification by stimulus detected mechanoreceptors touch pressure stretch vibration itch thermoreceptors temperature chemoreceptors chemicals in solution (taste, smell) changes in blood chemistry photoreceptors light nociceptors 1 harmful stimuli that cause pain Cranial nerves cranial nerves attach to the brain and pass through foramina in the skull innervate only head and neck structures (except for the vagus nerve, X) Spinal nerves 31 pairs of nerves attach to the spinal cord innervate most of the body inferior to the head C1-C8 cervical nerves C1 exits superior to the first vertebra C8 exits inferior to the seventh cervical vertebra all other nerves exit inferior to the vertebra with the same number T1-T12 thoracic nerves L1-L5 lumbar nerves S1-S5 sacral nerves Co1 coccygeal nerves dorsal root rootlets sensory fibers dorsal root ganglia lie within the intervertebral foramina (together with spinal nerves) ventral root rootlets motor fibers spinal nerve dorsal ramus (plural: dorsal rami) supply dorsum of the neck and trunk (the back) ventral ramus (plural: ventral rami) supply anterior and lateral regions of the neck and trunk, all regions of the limbs rami communicantes leads to sympathetic trunk ganglia know the difference between roots and rami nerve plexus, a network of nerves ventral rami of all of all spinal nerves except T2-T12 basic characteristics 1) each end branch of the plexus contains fibers from several different spinal nerves 2) fibers from each ventral ramus travel to the body periphery via several different routes or branches cervical brachial lumbar sacral 2
