part_of part of is part of part of contributes to morphology of anatomical entity anatomical entity sympathetic nervous system http://upload.wikimedia.org/wikipedia/commons/7/77/Gray838.png pars sympathica divisionis autonomici systematis nervosi sympathetic part of autonomic division of nervous system BIRNLEX:2516 The part of the autonomic nervous system which chiefly contains adrenergic fibres and tends to control and reduce secretions, decrease the contractility and hence the tone of smooth muscles and provoke the contraction of blood vessels. Essentially, it consists of preganglionic fibres from the thoracic and upper lumbar parts of the spinal cord. These fibres, by means of delicate rami communicantes, cross over to ganglia sited in a pair of ganglionated cords on each side of the vertebral column or to more peripheral ganglia. [Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] MESH:D013564 UMLS:C1269646 has developmental contribution from NC in verteberates (https://github.com/obophenotype/uberon/wiki/The-neural-crest) TAO:0001576 pars sympathica divisionis autonomici systematis nervosi CALOHA:TS-2050 ZFA:0001576 EHDAA:3769 uberon The sympathetic nervous system is one of the two divisions of the vertebrate autonomic nervous system (the other being the parasympathetic nervous system). The sympathetic preganglionic neurons have their cell bodies in the thoracic and lumbar regions of the spinal cord and connect to the paravertebral chain of sympathetic ganglia. Innervate heart and blood vessels, sweat glands, viscera and the adrenal medulla. Most sympathetic neurons, but not all, use noradrenaline as a post-ganglionic neurotransmitter [GO]. sympathetic nervous system UBERON:0000013 MIAA:0000100 EHDAA2:0001971 UMLS:C0039044 AAO:0010487 The autonomic nervous system is composed of three divisions: the sympathetic division, the parasympathetic division, and the enteric division. (...) In ray-finned teleost fishes, a sympathetic chain is present, and dual innervation of additional organs can be observed. A similar pattern can be found in amphibians (...). The evolution of the autonomic nervous system has been quite conservative, especially in the tetrapod lineage.[well established][VHOG] EMAPA:16985 BTO:0001832 MA:0000225 Part of the autonomic nervous system which has opposing physiological effects of the parasympathetic nervous system. Examples include increasing the heart rate or constricting the blood vessels.[AAO] NCIT:C12795 VHOG:0000384 EFO:0000893 FMA:9906 GAID:710 autonomic nervous system organ system subdivision