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πš™πš‘πš’πšœπš’πš˜πš•πš˜πšπš’ 𝟸 : πš›πšŽπš™πš›πš˜πšπšžπšŒπšπš’πš˜πš— > Implantation, Placentation and Hormonal Changes in Pregnancy > Flashcards

Implantation, Placentation and Hormonal Changes in Pregnancy Flashcards

1
Q

What is a blastocyst?

A

β†’ An embryo at the 5th or 6th day of development

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2
Q

What does the embryoblast give rise to?

A

β†’ The fetus

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3
Q

What are the three layers of the blastocyst?

A

β†’ Trophoblast
β†’ Blastocoel
β†’ Embryoblast

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4
Q

What does the trophoblast give rise to?

A

β†’ The placenta

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5
Q

What is the blastocoel?

A

β†’ The fluid filled cavity

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6
Q

What are the two things needed for implantation to occur?

A

β†’ The blastocyst has to be fully mature

β†’ A receptive endometrium is needed which expresses receptivity markers to communicate with the blastocyst

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7
Q

Describe hatching

A

β†’The blastocyst hatches out of the zona pellucida due to expansions and contractions
β†’ this herniates the blastocyst out of the zona
β†’ digestive enzymes break down the opposite pole of where the blastocyst is

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8
Q

Where do the enzymes dissolve the zona?

A

β†’ Abembryonic pole

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9
Q

What are the three stages of implantation?

A

1) Apposition
2) Attachment
3) Invasion

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10
Q

What is Apposition?

A

β†’ Close positioning of the blastocyst to the endometrium

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11
Q

What is Attachment?

A

β†’ Cells of the trophoblast attaching to endometrium

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12
Q

What is Invasion?

A

β†’ Trophoblast cells multiply and invade the endometrium

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13
Q

Describe how the embryo implants (days 7-11)

A

β†’ The blastocyst attaches itself to the surface of the endometrial wall (decidua basalis)
β†’ Trophoblast cells start to assemble to form a syncytiotrophoblast to facilitate invasion
β†’ Syncytiotrophoblast further invades the decidua basalis and by day 11 it is almost completely buried

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14
Q

Describe the decidual reaction

A

β†’ High levels of progesterone results in the enlargement and coating of the decidual cells in glycogen and lipid-rich fluid
β†’ the fluid is taken up by the syncytiotrophoblast and helps sustain the blastocyst early on before the placenta is formed

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15
Q

What is a syncytiotrophoblast?

A

β†’ A group of trophoblast cells which are multinucleated

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16
Q

How are primary villi formed?

A

β†’ Cells of the syncytiotrophoblast start to protrude out to form tree-like structures known as primary villi which are formed around the blastocyst

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17
Q

How are lacunae formed?

A

β†’ Decidual cells between the primary villi begin to clear out leaving behind empty spaces known as lacunae

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18
Q

How does the junctional zone form?

A

β†’ Maternal arteries and veins grow into the decidua basalis
β†’ Blood vessels merge with the lacunae
β†’ Arteries fill the lacunae with oxygenated blood
β†’ Veins return the deoxygenated blood to the maternal circulation
β†’ Blood filled lacunae merge to a single large pool of blood connected to multiple arteries and veins
β†’this is known as the junctional zone

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19
Q

When is the umbilical cord formed?

A

β†’ Around week 5

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20
Q

Describe how chorionic frondosum form?

A

β†’ Day 17 the fetal mesoderm cells start to form blood vessels within the villi
β†’ a basic network of arteries, veins and capillaries
β†’ capillaries connect with blood vessels in the umbilical cord
β†’ villi grow larger in size and develop into chorionic frondosum

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21
Q

What separates maternal and fetal blood cells?

A

β†’ The outer lining of the primary villi is in contact with the junctional zone
β†’ The lining of the endothelial cells of the decidual from the mothers side

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22
Q

When do the decidual septa form?

A

β†’ 4th and 5th month

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23
Q

What is the function of decidual septa?

A

β†’ They divide the placenta into 15-20 regions

β†’ This gives it a much larger surface area in contact with the maternal blood

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24
Q

What is the umbilical cord made up of?

A

β†’ Two arteries and one vein

25
What does the placenta take up?
β†’ O2 and glucose β†’ immunoglobulins β†’ hormones β†’ toxins
26
What does the placenta drop off?
β†’ Co2 | β†’ Waste products
27
What are the 4 functions of the placenta?
β†’ Provision of maternal O2, CHO, Fats, amino acids, vitamins, minerals, antibodies β†’ metabolism - synthesis of glycogen β†’Barrier - bacteria, viruses, drugs β†’ Removal of fetal waste products : CO2, urea, NH4, minerals β†’ Endocrine secretion e.g : hCG, estrogens, progesterone, HPL, cortisol
28
How is the placenta adapted to its function?
β†’ Huge maternal uterine supply - low pressure β†’ huge surface area in contact with maternal blood β†’ huge reserve in function
29
What is the placental barrier formed by?
β†’ Cells of the villi
30
How many pregnancies does pre-eclampsia affect?
β†’ 3-4%
31
When does pre-eclampsia start and how long can it last?
β†’ >20 weeks of gestation | β†’ can show up upto 6 weeks after delivery
32
What does pre-eclampsia result in?
β†’ Placental insufficiency - inadequate maternal blood flow to the placenta during pregnancy
33
What does pre-eclampsia cause?
β†’ new onset maternal hypertension and proteinuria
34
What are the 7 risk factors for pre-eclampsia?
``` β†’ First pregnancy β†’ Multiple gestation β†’ Maternal age > 35 β†’ Hypertension β†’ DIabetes β†’ Obesity β†’ Family history of pre-eclampsia ```
35
What is eclampsia?
β†’ Pre-eclampsia + seizures
36
What is pre-eclampsia caused by?
β†’ narrowing of maternal spiral arteries supplying blood to the placenta
37
Describe how pre-eclampsia works?
β†’ Placenta responds by secreting pro inflammatory proteins β†’ these enter the maternal circulation and cause dysfunction of the maternal endothelial cells β†’ this causes vasoconstriction and affects other body systems
38
What are the first signs of pre-eclampsia?
β†’ Proteinuria (impaired filtration) | β†’ high blood pressure
39
Why does proteinuria occur during pre-eclampsia?
β†’ Glomerular damage
40
What are the 6 risk factors for placental abruption?
``` β†’ Blunt force trauma β†’ Smoking and drug use β†’ multiple gestation β†’ Maternal age > 35 β†’ previous placental abruption β†’ hypertension from previous pre-eclampsia ```
41
What are the symptoms of placental abruption?
β†’ Vaginal bleeding | β†’ Pain in back and abdomen
42
What are the causes of placental abruption?
β†’ Degeneration of maternal arteries supplying blood to the placenta β†’ Degenerated vessels rupture causing haemorrhage and separation of the placenta
43
What are 4 complications that occur as a result of placental abruption?
β†’ Hypovolemic shock β†’ Sheehan syndrome β†’ Renal failure β†’ Disseminated intravascular coagulation
44
What is Sheehan syndrome?
β†’ Not enough blood to the pituitary | β†’ perinatal pituitary necrosis
45
What are fatal complications of placental abruption?
β†’ Intrauterine hypoxia and premature birth
46
What is placenta previa?
β†’ Placenta implants in the lower uterus | β†’ fully or partially covering the internal cervical os
47
What is placenta previa associated with?
β†’ Increased chances of preterm birth and fetal hypoxia
48
What are 7 risk factors associated with placenta previa?
``` β†’ Previous C section β†’ previous uterine/endometrial surgery β†’ uterine fibroids β†’ previous placenta previa β†’ smoking and drug use β†’ multiple gestation β†’ maternal age > 35 ```
49
What is the cause of placenta previa?
β†’ Endometrium in upper uterus not well vascularised
50
What do trophoblasts secrete?
β†’ hCG
51
What is the function of hCG?
β†’ It binds to LH receptors on the CL | β†’ results in synthesis and secretion of progesterone and estrogen
52
What is the ratio of progesterone to estrogen?
β†’ Progesterone is much higher
53
When is there a decline in hCG and why?
β†’ At week 7 | β†’ Placenta takes over and produces progesterone
54
When does hPL increase?
β†’ Around week 5
55
What is the function of hPL?
β†’ Makes the mother a bit more resistant to insulin so there is more glucose in the bloodstream available for mother and fetus
56
How does the placenta make progesterone?
β†’ Cholesterol is received from the placenta β†’ converted into pregnenolone and progesterone β†’ it makes its way to the mothers circulation
57
How does the placenta make estrogen?
β†’ Adrenal androgens from the fetus DHEA and DHEAS | β†’ placenta converts these into estrogens
58
What is the cause of gestational diabetes?
β†’ hPL not functioning properly

πš™πš‘πš’πšœπš’πš˜πš•πš˜πšπš’ 𝟸 : πš›πšŽπš™πš›πš˜πšπšžπšŒπšπš’πš˜πš— (12 decks)

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