The posterior lateral line lobe of a mormyrid fish--a Golgi study.

Abstract

AbstractThe posterior lateral line lobe is a rhombencephalic laminated structure. There is a topographic projection of anterior and posterior lateral line nerves upon the posterior lobe. The six separate lamina of the posterior lobe contain at least six cell types which can be distinguished on the basis of their dendritic trees. One lamina, the plexiform layer, contains the collateral plexus of the lamina of ganglion cells. There is an asymmetry in the dendritic fields and in the collateral plexus of neurons of the posterior lobe, such that their long axis runs in the sagittal plane.There is an extensive projection from granule cells of lobus caudalis to the posterior lobe molecular layer. This connection is organized in a fashion similar to that of the parallel fiber system of the cerebellum, i.e., the axons form an inverted T, the arms of which run parallel to the granule cell layer. This projection is confined to the upper part of the molecular layer, while the lower part of the molecular layer contains the axons arising in the posterior lobe granular layer.