Retroperitoneal paraganglia and the peripheral autonomic nervous system in the XXXX fetus.

@entity1 @entity129 @entity1514 @entity10810 @entity21
By means of the @entity10810 in toto staining method retroperitoneal paraganglia and the peripheral autonomic nervous system in @entity1 fetuses have been investigated. Many small retroperitoneal paraganglia are present near the sympathetic trunks close to the sympathetic trunk @entity21 . In the thoracic region small paraganglia are present in the intercostal spaces. Small splanchnic nerves entering small paraganglia have been described. In the lower sacral region no paraganglia are present. The major splanchnic nerve arises at various levels from the sympathetic trunks as well as many @entity1514 . Intermediate @entity21 are present in the major @entity129 and the communicating rami. In the sympathetic trunks many @entity21 are fused. In the @entity1 fetus there exists a large variability in number and diameter of the communicating rami. Interconnecting bundles of nerve fibers between the left and right sympathetic trunks are present at all levels, but most numerous at the sacral level.
