| Abstract: | Studies have been made on the motor activity of amnion and chick embryo from the 5th to the 14th day of development. Between the 5th and the 8th day of embryogenesis, when embryonic movements are rather poor, amnion contractions are mainly observed, their frequency being maximum to the 7th day. On further development (8-14 days), with the increase in the mass of the limbs which account for embryonic movements (body extremities), the increase in the intensity of their motor activity is paralleled by the decrease in the frequency of amnion contractions. Therefore, during the intensive growth and development of mainly frontal part of the embryo, the deficiency of motor activity of rather undeveloped body and extremities is presumably compensated by temporal motor activity of the amnion. Between the 8th and the 10th day, synchronous movements of embryo and amnion are observed. Possible mechanisms of synchronization are discussed. |
