AbstractThe small pyramidal neurons of layers II and III of the rat parietal
cortex have been examined with both Golgi staining and electron microscopy. The
cell body contains a large nucleus and only a thin rim of cytoplasm in which the
Nissl substance is not well developed. A cap of Nissl substance occurs at the
base of the apical dendrite, however, and a number of cisternae of the Golgi
apparat... hiện toàn bộ
AbstractThe method of embryonic tissue transplantation was used to confirm the
dual origin of avian cranial sensory ganglia, to map precise locations of the
anlagen of these sensory neurons, and to identify placodal and neural
crest‐derived neurons within ganglia. Segments of neural crest or strips of
presumptive placodal ectoderm were excised from chick embryos and replaced with
homologous tissue... hiện toàn bộ
AbstractPortions of the labyrinth or villi of placentas from late pregnancy from
nine species in four orders of mammals were examined with the electron
microscope. Pronounced patterns of layering of the trophoblast were found in
these placentas which were all of the hemochorial type. The laboratory rat,
laboratory mouse, hamster, and deer mouse have three layers of trophoblast
between the maternal... hiện toàn bộ