Abstract
The results of the present study generally agree with those obtained by Schuknecht et al. (1959), Vinnikov and Titova (1961, 1962, 1963, 1964) and Dohlman et al. (1958) with the light microscope in the cat, guinea pig and pigeon and by Kaneko (1968) and Kaneko and Daly (1968) with the electron microscope in the guinea pig.