Abstract
Normal adrenal cortical cells of embryos and young chicks of White-Leghorn domestic fowl were examined with the electron microscope.
1, Though most mitochondrial crests are not laminar but villous or tubular and are arranged irregularly in the cortical cell, some crests are parallel with one another in a few mitochondria, and long circinate tubular crests were rarely found. A few vacuolated mitochondria were found in the cortical cells of some normal embryos and chicks.
2. Mitochondrial dividings were noticed in a fairly large number in the cortical cell of the embryos and young chicks.
3. Moderately dense substances were observed in a few cytoplasmic vacuoles (endoplasmic reticulum) of the cortical cells in the young chick, Relationships among secretory substances, cytoplasmic vacuoles and mitochondria were discussed. We assume that the lipid implicated in cortical hormone is produced in the cytoplasmic vacuole with the aid of mitochondria.
