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A general Embryo (Lecturio) > Lect 9. Placenta and Fetal Membranes > Flashcards

Lect 9. Placenta and Fetal Membranes Flashcards

1
Q

What are the 2 sides of placenta?

A
  1. Basal plate (maternal side)
  2. Chorionic plate (fetal side)
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2
Q

2 features of Chorionic plate (fetal side)

  • Which side of placenta that Umbilical cord emerges from
A
  1. Chorionic plate (fetal side)
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3
Q

2 features of basal plate (maternal side)

A
  • Divided into lobes
  • Separated by septa
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4
Q

2 features of Chorionic plate (fetal side)

  • Contains ____, providing a massive surface for exchange
  • ____ emerges from the fetal side of the placenta.
A
  • branching chorionic villi
  • Umbilical cord
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5
Q

2 membranes of placenta

A
  • Amnion
  • Chorion
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6
Q

How many vessels that umbilical cord contain?

A
  • 2 arteries: carry deoxygenated fetal blood to the placenta
  • 1 vein: carries oxygenated blood back to the fetus
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7
Q

The role of umbilical arteries

A

carry deoxygenated fetal blood to the placenta

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8
Q

The role of umbilical arteries

A

carry deoxygenated fetal blood to the placenta

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9
Q

The role of uterine arteries

A

Bring oxygenated blood to each intervillous space

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10
Q

The role of umbilical veins

A

carries oxygenated blood back to the fetus

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11
Q

Placenta blood flow

→ Identify?

A
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12
Q

The role of uterine veins

A

Take deoxygenated blood from the placenta back to maternal iliac veins

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13
Q

PLACENTA BLOOD FLOW

→ IDENTIFY?

A
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14
Q

Fibroblasts become enlarged, polygonal, more active in protein synthesis, and are now called ___

A

decidual cells.

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15
Q

The whole endometrium is now called the decidua


(L. deciduus, falling off, shedding) and includes 3 areas

→ What are they?

A
  1. The decidua basalis between the implanted embryo and the myometrium.

  2. The decidua capsularis, the region between the embryo and the uterine lumen which thins as the embryo gets larger.

  3. The decidua parietalis, on the side of the uterus away from the embryo.
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16
Q

Fetal portion of placenta faces to ___ which includes ___

A
  • the amniotic cavity
  • amnion, chorionic plate & villi
17
Q

Maternal portion is formed by __

A

decidua basalis (basal plate) & placental septa.


18
Q

Chorionic villi of the developing placenta go through 3 stages. What are they?

A
  • Primary villi
  • Secondary villi
  • Tertiary villi
19
Q

Primary villi appear 2 days after implantation as (1)___ covered by (2)___ extend into lacunae containing maternal blood.

A
  1. simple cords of proliferating cytotrophoblast cells
  2. syncytiotrophoblast
20
Q

■ Secondary villi begin to form on about the 15th day of embryonic development as the primary villi are invaded by ____

■ Tertiary villi develop within a few more days as ____ differentiates to form capillary loops continuous with the embryonic circulatory system.

A
  • extraembryonic mesenchyme.
  • mesenchyme in the secondary villi
21
Q

The whole endometrium is now called the decidua


(L. deciduus, falling off, shedding) and includes 3 areas

  1. The decidua basalis between ____
  2. The decidua capsularis, the region between the ___ which thins as the embryo gets larger.
  3. The decidua parietalis, on ___
A
  1. the implanted embryo and the myometrium.
  2. embryo and the uterine lumen
  3. the side of the uterus away from the embryo.
22
Q

Identify

A
23
Q

Placental circulation

  • ___ provide a large surface area for maternal–fetal exchange.
A

Chorionic villi

24
Q

The role of Chorionic villi

A

provide a large surface area for maternal–fetal exchange.

25
Q

lacunae are created from ruptured maternal blood vessels in the (1)____ and fill (2)___

A
  1. in the decidua basalis layer of the endometrium
  2. the spaces surrounding the chorionic villi with maternal blood
26
Q

What is Placental barrier?

A

a selectively permeable membrane separating the maternal and fetal blood.

27
Q

The placental barrier is a selectively permeable membrane separating the maternal and fetal blood.

→ The barrier is comprised of the 6 layers

→ What are they?

A
  1. Syncytiotrophoblast
  2. Cytotrophoblast
  3. Trophoblast basal lamina
  4. Extraembryonic mesenchyme
  5. Endothelial basal lamina
  6. endothelial cells
28
Q

Fetal capillary

→ IDENTIFY

A
29
Q

Fetal Membranes

Placenta initially forms a sphere but as the embryo grows, the placenta thins on the side closest to uterine lumen and the embryo bulges into ___

A

uterine cavity

30
Q
  1. Edometrium that lines the uterus are called ___
  2. Endometrium overlying embryo are called ___
A
  1. Decidua parietalis
  2. Decidua capsularis
31
Q

Fetal Membranes

→ Identify

A
32
Q

Fetal membranes

→ Identify

A
33
Q

Fetal Membranes

→ Identify

A
34
Q

Fetal Membranes

By 3rd month, physiologic herniation of the small intestine has returned to the abdomen and only things in the umbilical cord are umbilical vessels and ___, supporting cushion of extraembryonic mesoderm

A

Wharton’s jelly

35
Q

Fetal Membranes

___ that separates the amniotic cavity from the cervix composed of amnion, smooth chorion, endometrium and smooth chorion

A

Amniochorionic membrane

36
Q

Fetal Membranes

Amniochorionic membrane that separates the amniotic cavity from the cervix composed of___ (4)

A

amnion, smooth chorion, endometrium and smooth chorion

37
Q

Fetal Membranes

Amniochorionic membrane that separates ___ from the cervix composed of amnion, smooth chorion, endometrium and smooth chorion

A

the amniotic cavity

A general Embryo (Lecturio) (10 decks)

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