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Université de Fribourg

Onset of synaptogenesis in the plexiform layers of the chick retina: A transmission electron microscopic study

Drenhaus, Ulrich ; Voigt, Tilman ; Rager, Günter

In: Microscopy Research and Technique, 2007, vol. 70, no. 4, p. 329 - 335

The presently acknowledged onset of synaptogenesis in the chick retina from embryonic day 12 (E12) onward stands in contrast with the appearance of spontaneous electrical activity, of presynaptic proteins, or of neurotransmitters during early formation of the inner (E6-E8) and outer (E9) plexiform layers. Therefore, we investigated the chick retina from E6 to E12 at which age first synapses...

Université de Fribourg

On the postnatal development of the striate cortex (V1) in the tree shrew (Tupaia belangeri)

Drenhaus, Ulrich ; Rager, Günter ; Eggli, Peter ; Kretz, Robert

In: European Journal of Neuroscience, 2006, vol. 24, no. 2, p. 479–490

Histological serial sections, three-dimensional reconstructions and morphometry served to study the postnatal development of V1 in tree shrews. The main objectives were to evaluate the expansion of V1, the implications of its growth on the occipital cortex and, vice versa, the effects of the expanding neocortex on the topography of V1. The future V1 was identified on postnatal day 1 by its...