Page 20, Early Development, Devel. Physiol., Dr. D. Penney

Fetal Circulatory Pattern:

The fetal circulation contains a number of special features (Table 2.07): The placenta, not the lung, is the organ of gas exchange.

Six unique fetal vascular channels are present, the two umbilical arteries, the umbilical vein, the ductus venosus, the crista dividens, the foramen ovale, and the ductus.arteriosus (Table 2.08).

The right and left sides of the fetal heart work in parallel, not in series as is the case in the adult; therefore, the outputs and work performed by each may and do differ.

To review adult heart blood flow pattern

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