Summary
In the chick embryo, up to the 16th day, successive destruction of the whole central nervous system causes no change in heart rate.
Later on, the destruction of the spinal cord causes a reduction in heart rate, but removal of the higher nervous centers has no definite effect. We conclude that at the 16th day the spinal cord begins to influence cardiac activity and the effect is due to the maturation of sympathetic cells of the lateral gray column. The higher nervous centers do not exert any definite influence on heart rate in chick embryos.
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Bogdanov, O.V. Effect of damage to different parts of the central nervous system on the cardiac activity of the chick embryo. Bull Exp Biol Med 50, 889–891 (1961). https://doi.org/10.1007/BF00797471
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DOI: https://doi.org/10.1007/BF00797471