[A quantitative analysis of the development of the auditory centers of the medulla oblongata in the hen].
Development of three auditory nuclei in medulla oblongata was studied in the chicken (Gallus gallus). Quantitative description of the volume growth of the magnocellular nucleus neurons and linear growth of the auditory nuclei is given from the formation of differentiated neuroblasts (Day 9 of embryogenesis) until the 180th day of postembryonic development. Growth of the embryos was described according to the Bertalanffy's model. Growth of the neurons proceeded at the highest rate at the rostral level of magnocellular nucleus (mN = 1.204 microns/day) and the lowest rate of the caudal level (mN = 1.045 microns/day). The curve of linear growth of the auditory nuclei is similar with the growth curve of the neurons and follows the Bertalanffy's equations. The magnocellular nucleus is characterized by the fastest growth (mN = 75.6 microns/day) and the angular nucleus by the slowest growth (mN = 52.0 microns/day). The growth of the neurons and auditory nuclei decreases before hatching.
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D000818:Animals; D001306:Auditory Pathways / Q000196:embryology* / Q000254:growth & development*; D002452:Cell Count; D002642:Chick Embryo; D002645:Chickens / Q000254:growth & development*; D005260:Female; D008526:Medulla Oblongata / Q000196:embryology* / Q000254:growth & development*; D009474:Neurons / Q000166:cytology / Q000502:physiology; D013997:Time Factors