Morphodynamics of the epidermis of the axolotl (Sideron mexicanum Shaw) under the influence of exogenous by administered thyroxine. I. Epidermis of neotenic axolotl

Fährmann, W.

Zeitschrift für Mikroskopisch-Anatomische Forschung 83(4): 472-506

1971


ISSN/ISBN: 0044-3107
PMID: 5166122
Document Number: 5512
The epidermis of neotenic axolotl consists of a non-keratinising stratified squamous epithelium (hight 130-130 im), which may be divided into a stratum basale, intermedium and superficiale. The following eell types may be distinguished: 1. Common epidermal cells: These are characterized by their polymorphism and a strongly folded nucleus. In the stratum basale they have prominent fibrillar elements (figures of Eberth), which appear as large bundles of tonofilaments upon electron microseopic investigation. All epidermal cells contain granules, which are found to consist of neutral and acid mucous substances. The epidermal cells are linked to the basement membrane by hemidesmosomes and to each other by wide processes with desmosomes and by small eell bridges. 2. Leydig cells: These are prominent beeause of their size and spezial granular and reticulate structures. The nucleus is surrounded by an area, which gives a basophilic reaction and contains endoplasmic reticulum, ribosomes, mitochondria and Golgi complexes. The granules are found mainly outside this area. From the histochemical investigations it may be assumed that they contain neutral mucous material. Towards the cell periphery may be found the Langerhans net, which basically has a filamentous structure. The connections to neighbouring cella are made mainly by narrow eell bridges. Wide processes with desmosomes are rarer. 3. Cover cells: These, predominantly flat, cells form the major part of the stratum superfieiale. A special differentiation is a mucous zone in their apical cytoplasm. This is composed of a number of relatively large mucous granules, which contain mainly complex aeid mucopolysaccharides. Endoplasmic reticulum and Golgi complexes are more clearly evident than in eommon epidermal cella. The outer cell membrane has short mierovilli. Using greater magnifieation it is possible to distinguish a fine thread-like material, which may form a loose network an the surface of the epidermis. The cover eells are closely linked at the lateral edges. Interdigitations of the cell membranes and desmosomes ensure the structural integrity. The apical termination of the intercellular clefts is formed by the zonulae occludentes. 4. Mitochondria-rich cells: Using the light microseope these eould not be determined -with certainty. They are of Club-like shape and extend to the surface of the epidermis with their apical eell parts. Numerous mitochondria and vesicles may be observed in their supranuclear and apical cytoplasm. 5. X-cells: These are relatively small eells of mostly spherical shape, which may contain large quantities of very heterogenous materials. Through this the nucleus is frequently found peripherally. Desmosomes could not be observed. The morphological characteristics lead to the conclusion that these may be mobile cells with phagocytic properties.

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Morphodynamics of the epidermis of the axolotl (Sideron mexicanum Shaw) under the influence of exogenous by administered thyroxine. I. Epidermis of neotenic axolotl