The influence of the intrauterine environment on human placental development,10.1387/ijdb.082764gb,International Journal of Developmental Biology,Grah

• ...Changes in the nature of nutritional supply are observed during the change to an increased maternal blood flow with histiotrophic nutrition provided by the endometrial glands in early first trimester tissue changing to haemotrophic nutrition provided by the increase in maternal blood perfusion in late first trimester tissue (Burton et al. 2010)...
• ...Other changes include the change from histiotrophic nutrition in early first trimester to haemotrophic nutrition in late first trimester tissue (Burton et al. 2010) which may lead to changes in nutrient supply involving lipids being more readily available to tissue once effective perfusion of blood supply commenced...

Warwick B. Dunn, et al. The metabolome of human placental tissue: investigation of first trime...