The fine structure of the choroid plexus of the immature pig consists of an epithelial layer of cells contiguous with a subepithelial region containing fibrillar elements. The apical surface is extended as numerous digitiform microvilli. At irregular intervals, apical tufts of cilia occur that contain 10–14 cilia with a typical 9+2 subfibrillar arrangement. The cytoplasm is composed of randomly distributed smooth tubular endoplasmic reticulum, apically concentrated cisternae of rough endoplasmic reticulum, Golgi areas, glycogen and numerous mitochondria. Lateral cell membranes are typically tortuous, interdigitating and possess an apical tight junction. Various vesicles are found including pinocytotic vesicles, lipoid inclusions and lysosomes. A comparative ultrastructural study of the choroid plexuses from the lateral, third and fourth ventricles failed to demonstrate significant differences between these structures of different embryological origin.
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Davis et al. (1973) studied this question.
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