By GILBERT GOTTLIEB (Eds.)
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Extra info for Aspects of Neurogenesis
In the kitten exactly the same sequence of events characterizes the devel opment of synapses, although additional features have also been recorded (Adinolfi, 1971). Before birth, desmosomal junctions are present between cell bodies and processes in the neuropil. Presumptive symmetrical axoden dritic contacts are present, but few vesicles can be seen in the presynaptic terminal. In the newborn, desmosomal junctions disappear, and recogniz- DEVELOPMENT OF THE CEREBRAL NEOCORTEX OF THE RAT 47 FIG.
Others have suggested that the layer may be involved in gliogenesis (Brun, 1965; Opperman, 1929; Rabinowicz, 1964; Rauke, 1909). B. Gliogenesis The classical theories proposed that the stem cells of glia and neurons were demarcated early in the neural epithelium and that thereafter each de- 28 MARTIN BERRY veloped separately. With the uncertainty about the fate of the germinal cell, however, gliogenesis has become a subject of much conjecture. Berry and Rogers (1966) studied gliogenesis autoradiographically but were unable to decide on the one hand whether germinal cells formed neurons during the first stage of their life history and glial cells subsequently (S.
The glial process may engage the axon at a discrete point and the first few turns of the process may be localized by allowing growth to occur at the mesoaxon only (Gaze & Peters, 1961; Maturana, 1960; Peters, 1960; Wechsler, 1967). Myelination may subsequently proceed by the addition of lamellae and the longitudinal growth of the myelin sheath over the segment of the axon. 3 m/u (Matthews, 1968; Seggie & Berry, 1972). The number of turns made by the mesoaxon is determined by the diameter of the axon by some unknown mechanism.