Abstract
Each of the first five plates of this chapter contains four micrographs showing rather identical segments of fetal cotyledons in various stages of their development. The demonstration starts at week 12 of pregnancy (a), followed by specimens at week 22 (b), and week 34 (c), to compare the developmental equivalents of maturation to the ultimate state of the mature placenta (d). The segments selected for SEM analysis for study of the internal surface of a fetal cotyledon compare well to each other. Plates 8.1 and 8.2 illustrate the organization of a villous tree exhibiting stem villi, the tertiary villi being terminal branches. Plates 8.3 to 8.5 illustrate the surface differentiation which obviously does not depend intensively on the gestational age. Plate 8.6 gives an impression on the process of sprouting occurring at the tissue surface of a first trimester placenta. Sprouting and forming of knots should be interpreted as a sign of placental growth that occurs not only in placentas of young gestational age but sometimes into the phase of postmaturity.
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Ludwig, H., Metzger, H. (1976). The Placenta. In: The Human Female Reproductive Tract. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66345-1_11
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DOI: https://doi.org/10.1007/978-3-642-66345-1_11
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