Abstract
AbstractThe present study was undertaken to observe the morphological changes which take place during the histogenetic development of the chick telencephalic choroid plexus between the eighth and twentieth day of embryonic life. The plexuses were removed under the dissecting microscope and processed by freezedrying. The paraffin‐embedded sections were stained according to Cowdry's method for mitochondria and with Periodic Acid Schiff's reagent for glycorgen. The sections were viewed using bright light and phase optics.The most pertinent findings involved (1) a change in the epithelium from a pseudostratified to a low columnar cell type and (2) an increase in the number of mitochondria with their final distribution pattern being at the brush border of the choroidal epithelium. These changes developed between the ninth and twelfth day and became stabilized by the sixteenth day. The significance of the morphological changes and the possible correlation between the mitochondrial location and number and some physiological features of active transport is discussed.
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