Study of cardiac, respiratory, and motor activities in rat fetuses

摘要: Development of the cardiac, respiratory, and motor activities in rat fetuses with preserved placental circulation was studied at 16th, 18th, 20th gestation days. The presence three main movement types has been found: complexes generalized activity, local movements, jerks. In development respiratory function, there is observed a gradual transition from individual inspirations to series breathing movements then formation periodic episodes. At period, heart rate found increase. existence slow-wave modulations period 2040 s revealed. Analysis interrelations between systems shown that 16-day fetuses, each accompanied by extensor jerk. By days embryonic (E20), uncoupling occurs. Comparison activity cardiac somatomotor E16, rhythm fluctuations do not depend on excitation 18-day brief slowing down (decelerations) appeared during jerks, whereas E20, contrary, an increase frequency (accelerations) occurred.