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Retinofugal projections in hedgehog-tenrecs (Echinops telfairi and Setifer setosus)

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Summary

Using the autoradiographic tracing technique the retinal projections were studied in the tenrecs, Echinops telfairi and Setifer setosus (insectivora, tenrecidae). Bilateral projections were found to the n. suprachiasmaticus, the anterior hypothalamic area, the dorsal and ventral lateral geniculate bodies, the pretectal olivary nucleus and the superior colliculus. The contralateral projections were usually more intense than the ipsilateral ones except the retinohypothalamic connections. A partial segregation of the projection fields from both eyes was present in the dorsal and ventral lateral geniculate bodies. In the superior colliculus retinal fibers predominantly involved the stratum zonale and the upper portion of the stratum griseum superficiale on both sides. The projections to the deeper portion of the colliculi were rather faint, particularly on the ipsilateral side. Target areas receiving contralateral projections exclusively were the periamygdaloid area (labeled only in Setifer), the terminal accessory nuclei including the n. tractus optici and the inferior colliculus. The data are compared with other species. The most striking finding may concern the projection to the medial terminal nucleus being quite prominent in marsupials and most eutherian mammals (including the erinaceomorphous hedgehogs), but greatly reduced in tenrecs and primates.

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Abbreviations

ae :

commissura anterior

AmP :

periamygdaloid area

Col :

colliculus inferior

CoS :

colliculus superior

cp :

cerebral peduncule

Ec :

Echinops telfairi/lesser hedghog-tenrec

GLD :

corpus geniculatum laterale, pars dorsalis

GLV :

corpus geniculatum laterale, pars ventralis

GLVa-d :

subdivisions of GLV

GM :

corpus geniculatum mediale

HbM :

n. habenulae medialis

HyA :

anterior hypothalamic area

oc :

chiasma opticum

on :

nervus opticus

ot :

tractus opticus

PT :

pretectum

PTO :

n. olivarius praetectalis

Ru :

n. ruber

SCh :

n. suprachiasmaticus

Se :

Setifer setosus/greater liedgehog-tenrec

SGI :

stratum griseum intermedium

SPG :

stratum griseum profundum

SGS :

stratum griseum superficiale

SO :

stratum zonale

To :

n. motorius nervi trochlearis

TmD :

n. terminalis dorsalis

TmL :

n. terminalis lateralis

TmM :

n. terminalis medialis

TrO :

n. tractus optici

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  1. H. Künzle

    Present address: Anatomische Anstalt, Universität München, Pettenkoferstr. 11, D-8000, München, Germany

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  1. Anatomische Anstalt, Universität München, Federal Republic of Germany

    H. Künzle

  2. Brain Research Institute, University of Zürich, Switzerland

    H. Künzle

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Künzle, H. Retinofugal projections in hedgehog-tenrecs (Echinops telfairi and Setifer setosus). Anat Embryol 178, 77–93 (1988). https://doi.org/10.1007/BF00305017

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