Placental trophotropism refers to a phenomenon where there is dynamic migration of the placenta at its insertion through gestation. The placenta tends to grow in areas of good blood supply and nutrition and artophies in areas with poor blood supply and poor nutrition. It may play a role in development of abnormal placental shapes - see variation in placental morphology.
Placental trophotropism is the reason why placenta previa noted in an early pregnancy scan may resolve in a later scan. The placenta moves at approximately 1 mm per week 3.
- 1. Farquharson RG, Stephenson MD. Early Pregnancy. Cambridge Univ Pr. (2010) ISBN:0521517087. Read it at Google Books - Find it at Amazon
- 2. Baergen RN, Benirschke K. Manual of Pathology of the Human Placenta. Springer Verlag. (2010) ISBN:1441974938. Read it at Google Books - Find it at Amazon
- 3. Reddy UM, Abuhamad AZ, Levine D, Saade GR. Fetal imaging: executive summary of a joint Eunice Kennedy Shriver National Institute of Child Health and Human Development, Society for Maternal-Fetal Medicine, American Institute of Ultrasound in Medicine, American College of Obstetricians and Gynecologists, American College of Radiology, Society for Pediatric Radiology, and Society of Radiologists in Ultrasound Fetal Imaging Workshop. Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine. 33 (5): 745-57. doi:10.7863/ultra.33.5.745 - Pubmed