Placentation — Flashcards

Flashcard 1: The _____ are remnants of the obliterated umbilical arteries

Answer: medial umbilical folds

Flashcard 2: Which chorionic villi contain an outer layer of syncytiotrophoblast and a central core of cytotrophoblast?_____

Answer: Primary

Flashcard 3: Which chorionic villi contain an outer layer of syncytiotrophoblast, an intermediate core of cytotrophoblast and an inner core of EEM?_____

Answer: Secondary

Flashcard 4: Nephrogenesis continues through _____ to 36 weeks of gestation

Answer: 32

Flashcard 5: The _____ layer in contact with the syncytiotrophoblast at the floor of the intervillous space (maternal side) is known as Rohr's layer.

Answer: fibrinoid

Extra: Placental Fibrinoid Layers: - **Rohr's layer**: Found at the floor of the intervillous space, in contact with the syncytiotrophoblast. - **Nitabuch's layer**: Found at the junction of the cytotrophoblast shell and the decidua basalis. (Note: This layer is absent in placenta accreta).

Flashcard 6: The cells shown in the image are_____ present adjacent to the neural tube (NT)

Answer:  neural crest cells (NCC) 

Flashcard 7: Membranous part of the interventricular septum is derived from _____.

Answer: endocardial cushions

Flashcard 8: VACTERL syndrome is due to _____ defects

Answer: mesodermal

Flashcard 9: The embryonic _____ gives rise to the smooth parts (outflow tracks) of the left and right ventricles

Answer: bulbus cordis

Flashcard 10: Bones of the _____, facial bones, and clavicle are formed via membranous ossification.

Answer: calvarium