Autonomic nervous system Sympathetic and parasympathetic nervous systems

Autonomic nervous system Sympathetic and parasympathetic nervous systems

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Autonomic nervous system Sympathetic and parasympathetic nervous systems Sympathetic T1-L2/3 Preganglionic: ACh Postganglionic: NA (viscera)/ACh (sweat glands) Route to target at spinal level, via sympathetic chain or middling collateral ganglia (NB. Adrenal) Sympathetic Preganglionic Neurones (SPNs) arise predominantly in lateral horn of spinal cord: o Reach target in number of manners o Gland itself is effectively the ganglion & arises from neural crest (as do rest of sympathetics) Involved in ‘Fight or Flight’ type behaviour Parasympathetic Preganglionic: ACh Postganglionic: ACh Route to target via ganglion situated close to target CNIII (Oculomotor): o Origin: Edinger-Westphal Nucleus o Controls: Eye Muscles CNVII (Facial): o Origin: Superior Salivatory Nucleus o
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Unformatted text preview: • CNIX (Glossopharyngeal): o Origin: Inferior Salivatory Nucleus o Controls: Salivary Glands • CNX (Vagus): o Origin: Nucleus Ambiguus; Dorsal Motor Nucleus of the Vagus (DMV) o Controls: Heart; Lungs; Liver; Intestine & others • S2-S4: o Origin: Lateral horn of Spinal cord o Controls: Genitals; Rectum; Urinary System Sympathetic & Parasympathetic nervous systems act synergistically Afferents to ANS • Considerable afferent system to the ANS • Visceral afferents arise from o Thermoreceptors (e.g. in skin) o Mechanoreceptors (gut wall, bladder wall & blood vessels) o Chemoreceptors (carotid bodies) o Pain receptors (responding to stretch or anoxia) • Ascend bilaterally in distinct multisynaptic pathways • Sensation poorly localised, except in the need for urination & defaecation • General rule: o Afferents involved in reflex control travel in PNS o Pain afferents travel in SNS...
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Autonomic nervous system Sympathetic and parasympathetic nervous systems

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