The Knollenorgan Pathway in the Central Nervous System

The diagram shows the projection of the time-coding knollenorgan electroreceptor into the central nervous system.  The pathways were determined using tract-tracing techniques of fluorescent dye injection, and HRP (Enger et al, 1976;  Bell et al, 1981).  Three areas are represented in this graph:  the electroreceptor periphery,  the hindbrain nucleus, nELL,  and the midbrain, ELa and ELp.  


ELa:  midbrain exterolateralis nucleus pars anterior.

ELp: midbrain exterolateralis nucleus pars posterior.

MV: midbrain nucleus medialis ventralis

nELL: nucleus of the Electrosensory Lateral Line Lobe (hindbrain).

From Friedman & Hopkins (in press)


Bell, C. C., Finger, T. E. and Russell, C. J. (1981). Central connections of the posterior lateral line lobe in mormyrid fish. Experimental Brain Research 42, 9-22.

Enger, P. S., Libouban, S. and Szabo, T. (1976). Fast conducting electrosensory pathway in the mormyrid fish, Gnathonemus petersii. Neurosci. Lett. 2, 133-136.

Friedman, M. A. and Hopkins, C. D. (in press). Neural substrates for species recognition in the time-coding electrosensory patheway of mormyrid electric fish. J. Neuroscience .

Mugnaini, E. and Maler, L. (1987). Cytology and immunocytochemistry of the nucleus exterolateralis anterior of the mormyrid brain: possible role of GABAergic synapses in temporal analysis. Anat. Embryol. 176, 313-336.