Abstract
Changes of the sodium and potassium ionic concentrations were observed during the development of rhythmic amniotic movements. A considerable increase of the ion content in muscular tissue occurred from the 5th to 7th day of incubation; from the 10th to 11th day there was a slight increase of the sodium and potassium content which reverted to normal values on the 13th day of incubation. These alterations may be associated with changes in cholinesterase activity and intensity in the amniotic contractions.
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