Efferent projections of the posterior lateral line lobe in gymnotiform fish
Article first published online: 9 OCT 2004
Copyright © 1982 Alan R. Liss, Inc.
Journal of Comparative Neurology
Volume 211, Issue 2, pages 154–164, 20 October 1982
How to Cite
Maler, L., Sas, E., Carr, C. E. and Matsubara, J. (1982), Efferent projections of the posterior lateral line lobe in gymnotiform fish. J. Comp. Neurol., 211: 154–164. doi: 10.1002/cne.902110205
- Issue published online: 9 OCT 2004
- Article first published online: 9 OCT 2004
- Manuscript Accepted: 7 JUL 1982
The posterior lateral line lobe (PLLL) of gymnotoid fish has efferent projections to two midbrain regions: the nucleus praeeminentialis dorsalis (n.P.d.) and the torus semicircularis dorsalis (T.Sd.). Both ipsilateral and contralateral connections are present; the n.P.d. receives nearly equal input from both sides while the T.Sd. receives a stronger contralateral input. The PLLL projection to n.P.d. merely maps medial PLLL to ventral n.P.d. and lateral PLLL to dorsal n.P.d., thus preserving the separate topography and relative orientation of the four electrosensory maps found in the PLLL. Only PLLL pyramidal cells (basilar and nonbasilar pyramids) contribute to this projection. The four PLLL electrosensory maps converge onto T.Sd. so that they map the dorsal body surface onto medial T.Sd. and the ventral body surface onto lateral T.Sd. Pyramidal cells, spherical cells, and multipolar cells contribute to this projection.
A small commiusural connection links homologous segments of the PLLL; these fibers arise from polymorphic cells of the PLLL.