December 17, 2022

The preganglionic fibres of the parasympathetic nervous system arise from the cell bodies of the CNS. The preganglionic fibres originate from the nuclei of the third, seventh, ninth and tenth cranial nerves (CN III, VII, IX, and X), and, the fourth sacral segments (S2 to S4) of the spinal cord. The parasympathetic nervous system has

The preganglionic fibres of the sympathetic nervous system arise from the cell bodies spanning from the Thoracic (T1) to the Lumbar (L2) part of the spinal cord. The Sympathetic Nervous System is made up of the following parts: Sympathetic Trunks : These represent a pair of long cords located on either side of the vertebral column. They extend from