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This 1 page Class Notes was uploaded by Jess Graff on Monday May 2, 2016. The Class Notes belongs to BMS 508 at University of New Hampshire taught by Mary Katherine Lockwood, PhD in Spring 2016. Since its upload, it has received 5 views. For similar materials see Human Anatomy and Physiology II in Biological Sciences at University of New Hampshire.
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Date Created: 05/02/16
BMS 508.03 5/2/2016 Chapter 26 (cont) Urinary System (cont) Urine Transport, Storage, and Elimination • The Micturition Reflex and Urination • Postganglionic neuron in intramural ganglion stimulates detrusor muscle contraction • Interneuron relays sensation to thalamus • Projection fibers from thalamus deliver sensation to cerebral cortex • Voluntary relaxation of external urethral sphincter causes relaxation of internal urethral sphincter • Begins when stretch receptors stimulate parasympathetic preganglionic motor neurons • Volume >500 mL triggers micturition reflex • Infants • Lack voluntary control over urination • Corticospinal connections are not established • Incontinence • Is the inability to control urination voluntarily • May be caused by trauma to internal or external urethral sphincter