ANS 16-1.doc

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University of British Columbia
KIN 190
Blythe Nielson

Learning expectations for BIOL 131. Chapters 16, ANS You should be able to: • Describe the anatomy and roles of the Autonomic nervous system. - Peripheral nerves contain motor/sensory nerves, motor nerves can be somatic/innervate smooth muscle, cardiac muscle and glands, autonomic pathways (synapsing cells along a route) have ganglia outside spinal cord (pre/postganglionic neurons) - Unconscious regulation, target tissues stimulated or inhibited, 2 synapses (ganglion/effector), receptor molecules • Define ‘autonomic pathway’. - Synapsing cells along a route • Compare the somatic and the automatic nervous systems including generalities and specifics. - Somatic: motor neurons innervate skeletal muscles, conscious/unconscious movement, one synapse (at effector), acetylcholine, receptor molecules are nicotinic. - Autonomic: motor neurons innervate smooth/cardiac muscles, glands, pathways include ganglia outside spinal cord, pre/post ganglionic neurons, unconscious regulation, target tissues stimulated/inhibited, 2 synapses (one at ganglion/one at effector), acetylcholine from preganglionic neurons and Ach OR norepinephrine from postganglionic neurons. Receptor molecules vary w/ synapse and neurotransmitter (With chain ganglia) • Describe the roles of the sympathetic and parasympathetic nervous system and compare/contrast the two. - Sympathetic: prepares body for exercise, affects organs via cranial nerves/plexuses, skin: sweat glands, smooth muscle of bv, arrector pili (skin vessels constrict, sweat glands activate, hair stands on end>skin is cold and clammy), head: eyes (pupils dilate), heart/lungs: bronchioles/cardiac muscles (increased heart/respiratory rate, bronchiole dilation), organs of abdominopelvic cavity: reduced gut movement, increased sphincter tone, reduced reproductive/urinary organ functions. - Parasympathetic: Prepares for rest, affects organs via cranial nerves/plexuses. Head: salivary glands/eyes (pupils constrict/some salivary glands activate), Vagus nerve/plexuses: heart, lungs, esophagus (muscles relax, skin vessels dilate>skin is warm and dry), abdominopelvic plexuses: stomach (increased digestive activity), pelvic splanchnic nerves/plexuses: colon, bladder (increase activity for digestion/repair, sphincters relax/may cause bladder to void) • Define “enteric nervous system” and state its role. - Contains nerve plexuses within walls of digestive tract, controls smooth muscle contractions, gland secretions, detects changes in content of lumen - Enteric sensory neurons detect changes in chemical composition of contents of digestive tract/stretch of digestive tract wall, enteric motor neurons stimulate/inhibit smooth muscle contraction or gland secretion, enteric interneurons connect enteric sensory/motor neurons to eachother. • Describe in detail the anatomy of the sympathetic nervous system and the parasympathetic system and compare/contrast the two. - Sympathetic: preganglionic cell bodies are in the thorocolumbar region of the spinal cord, preganglionic axons pass through ventral roots to lining of abdominal
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