ULTRASTRUKTURELLE VERÄNDERUNGEN DER ZELLMEMBRAN, BASALMEMBRAN UND KAPILLARE BEI VERSCHIEDENEN FUNKTIONSZUSTÄNDEN DER MENSCHLICHEN SCHILDDRÜSE

Abstract

ABSTRACT Apical and basal membranes of activated cells show definite increase in membrane potential. Microvilli are frequently encountered, pseudopodia representing macropinocytosis infrequently. The lateral cell border shows definite morphological criteria of intercellular metabolic exchange. Small ducts lined by microvilli are described and discussed as to their relation to lymphatics. The formation and desintegration of the basal membrane is determined by hormonal (TSH) stimulation and the state of activity of the cell. Intraepithelial capillaries occurring in the human thyroid are described. Polar differentiation analogous to other organs can be demonstrated here as well.