Discussion Placenta Flashcards Preview

CBNS169 Human Embryology > Discussion Placenta > Flashcards

Flashcards in Discussion Placenta Deck (11):
1

The Placenta

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2

The Placenta at 22 weeksFetal and Maternal Surfaces

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3

What are the major functions of the Placenta?

Nutrition
  Provide fetus with nutrients
Excretion
  Fetal kidneys don’t function for excretion yet, so use placenta
Respiration
  Blood from mom contains oxygen and is carried to the embryo/fetus through the placenta
Endocrine
  Exchange of hormones through blood to maintain pregnancy

4

Blood Flow in Placenta

Maternal blood enters the intervillous space from the endometrial arteries in the decidua basalis. Blood is discharged in the intervillous space. The large space is drained by endometrial veins that also penetrate this area. The numerous branch chorionic villi are continuously showered with maternal blood that circulates through the intervillous space.

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5

Blood Flow in Placenta Continued

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6

Abnormal Placentas

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7

Placental Membrane

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8

Fetal Microchimerism

Fetal cells can breech the placental membrane and have been found in the mother.

Fetal cells can populate various organs in the mothers body. May later help to repair damaged or diseased organs.

Advantage: isolate the fetal cells from mothers blood and sequence the genome – could be used to detect any congnital defects

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9

Anatomy of Umbilical Cord

Normal umbilical contains:
  Two arteries (de-oxygenated)
  One vein (oxygenated)
  Embedded within loose, proteoglycan rich matrix (Wharton’s jelly)
  Substance is resistant to twisting and compression
  Property of the umbilical cord is to protect the critical vascular lifeline between the placenta and the fetus

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10

Cross-Section of Umbilical Cord

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11

Normal vs. AbnormalUmbilical Cords

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