Sympathetic system

2.Sympathetic Nervous System

The pre ganglionic neurons of the sympathetic system have their origin (cell bodies) in the thoracic and lumbar region (thoracolumabar) of the spinal cord. There are two major groups of sympathetic ganglia, Para vertebral ganglia (lie in vertebral column) and prevertebrl column (lie in abdomen; e.g. celiac or mesenteric ganglia). The adrenal medulla resembles a sympathetic ganglia and preganglionic fibres innervate it.

Fig. 2.3 Sympathetic nervous system