Efferent projections of the posterior lateral line lobe in gymnotiform fish

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.

[1]  L. Maler,et al.  The posterior lateral line lobe of certain gymnotoid fish: Quantitative light microscopy , 1979, The Journal of comparative neurology.

[2]  R. H. Hamstra,et al.  Coding properties of two classes of afferent nerve fibers: high-frequency electroreceptors in the electric fish, Eigenmannia. , 1973, Journal of neurophysiology.

[3]  P. S. Enger,et al.  Rhombo-mesencephalic connections in the fast conducting electrosensory system of the mormyrid fish, Gnathonemus petersii. An HRP study , 1976, Neuroscience Letters.

[4]  A. Graybiel,et al.  A microelectrophoretic delivery technique for use with horseradish peroxidase. , 1974, Brain research.

[5]  T. Szabo,et al.  Convergence of common and specific sensory afferents to the cerebellar auricle(auricula cerebelli) in the teleost fish Gnathonemus demonstrated by HRP method , 1979, Brain Research.

[6]  H. Karten,et al.  Differential projections of ordinary lateral line receptors and electroreceptors in the gymnotid fish, Apteronotus (Sternarchus) albifrons , 1974, The Journal of comparative neurology.

[7]  J. Bastian.  Electrolocation: II. The effects of moving objects and other electrical stimuli on the activities of two categories of posterior lateral line lobe cells inApteronotus albifrons , 1981 .

[8]  C E Carr,et al.  Laminar organization of the afferent and efferent systems of the torus semicircularis of Gymnotiform fish: Morphological substrates for parallel processing in the electrosensory system , 1981, The Journal of comparative neurology.

[9]  F. Haugede-Carre,et al.  The mesencephalic exterolateral posterior nucleus of the mormyrid fish Bryenomyrus niger: efferent connections studied by the HRP method , 1979, Brain Research.

[10]  L. Maler,et al.  The cytology of the posterior lateral line lobe of high‐frequency weakly electric fish (gymnotidae): Dendritic differentiation and synaptic specificity in a simple cortex , 1981, The Journal of comparative neurology.

[11]  M. Mesulam,et al.  Tetramethyl benzidine for horseradish peroxidase neurohistochemistry: a non-carcinogenic blue reaction product with superior sensitivity for visualizing neural afferents and efferents. , 1978, The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society.

[12]  C. Carr,et al.  Peripheral organization and central projections of the electrosensory nerves in gymnotiform fish , 1982, The Journal of comparative neurology.

[13]  J. Bastian.  Electrolocation: I. How the electroreceptors ofApteronotus albifrons code for moving objects and other electrical stimuli , 1981 .