1. Originates in the thoracic regions of the spinal cord; opposes physiological effects of the parasympathetic: reduces digestive secretions; speeds the heart; contracts blood vessels

Derived forms: sympathetic nervous systems

See also: sympathetic

Type of: nervous system, systema nervosum

Part of: ANS, autonomic nervous system

Encyclopedia: Sympathetic nervous system

• Hylocichla guttata
• Hylocichla mustelina
• Hylophylax
• Hylophylax naevioides
• Hyman George Rickover
• Hyman Rickover
• hymen
• Hymenaea
• Hymenaea courbaril
• hymenal
• Hymenanthera
• hymeneal
• hymeneals
• hymenium
• Hymenogastrales
• Hymenomycetes
• Hymenophyllaceae
• Hymenophyllum
• hymenopter
• Hymenoptera
• hymenopteran
• hymenopteron
• hymenopterous
• hymenopterous insect
• Hymenoxys acaulis