Gerhard J. Bijvank

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Investigations by scanning electron microscopy demonstrate the existence of several morphologically different types of olfactory receptors in Carassius auratus. The structural differences, however, do not allow a definite classification of sensory cells into functionally different elements. The olfactory organ has a central axis with lamellae emerging at(More)
The zonule fibers are composed of numerous fibrils measuring 1–2 μ in diameter. Owing to their course, two different groups of about equal size can be distinguished: The fibers originating from the pars plana go to the anterior aspect of the lens, whereas those coming from the ciliary valleys and the sides of the ciliary processes insert on the posterior(More)
The appearance and fine structure of the surface of endoepithelial glands in the regio olfactoria of Carassius auratus are described. The phases of accumulation of secretory droplets, their excretion, and their significance for the production of the terminal mucous film are demonstrated and discussed. Two different kinds of endoepithelial glands formation(More)
The surface of the retinal pigment epithelium in chick embryos and young chicks was studied by scanning electron microscopy. It is demonstrated, that pigment cells not only have fine processes on their retinal surface, but also to a considerable extent on their basal cell membrane. The occurrence of these processes was studied during differentiation of the(More)
The epiblast of young chick embryos of stages 4–8 (Hamburger and Hamilton) was investigated by scanning electron microscopy. On the basis of surface differentiation, two zones can be distinguished. 1. Paramedian, where the epithelium is pseudostratified, the cell borders are marked by specialized vesicular and bowl-like structures. 2. Laterally, where the(More)
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