Summary
The author recommends a method of recording the respiration in fetuses of mammals with the aid of a thermistor and piezocrystal. By changing the electroconductivity in temperature variations in the inspired and expired air the thermistor permits graphic registration of respiration in fetuses. The movements of the thoracic wall in fetuses may be recorded by means of a piezocrystal producing currents in deformation. Both variants of the advocated method enable us to register the respiration in rabbit fetuses beginning from the moment of its appearance, i.e., from the 20th–22nd day of intrauterine development when the weight of the fetuses does not exceed 3–6 gms.
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Pronin, L.A. A method of recording the respiration of the mammalian fetus. Bull Exp Biol Med 48, 1552–1554 (1959). https://doi.org/10.1007/BF00792756
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DOI: https://doi.org/10.1007/BF00792756