Peri-implantation: 0-2 weeks
Uterine glands
Endometrial stroma - glycogen
Embryonic: 3-8 weeks
Maternal plasma in lacunae
anaerobic metabolism
Fetal: 9 weeks - birth
Maternal whole blood 12 wks
aerobic metabolism
Metabolic needs
Langman’s Medical Embryology, 8th ed., TW Sadler Lippincott, Williams & Wilkins (Philadelphia) 2000
, preface