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ABOG > Embryology > Flashcards

Embryology Flashcards

1
Q

What stage of a developing embryo is present during implantation?

A

Blastocyst

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2
Q

What is the embryological origin of Urethra, Bladder and lower 2/3 vagina?

A

Urogenital Sinus

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3
Q

What is the embryological origin of the uterus and upper 1/3 vagina?

A

Paramesonephric ducts
–> fuse ventral to meso mesonephric ducts)
–> uterovaginal primordium
—–> UV primordium (projects to urogenital sinus)

—> Mullerian ubercle –> vaginal plate –> canalization

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4
Q

What is dominant in male versus females for embryological genital devlopment?

A

Male = mesonephric ducts (epididymys, ductus deferns)
Female paramesonephric ducts

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5
Q

Embryology: Urogenital sinus?

A

bladder, urethra, lower 2/3 vagina

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6
Q

Embryology: hymen origin?

A

Mullerian tubercle

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7
Q

Embryology: Clitoris origin?

A

Phallus

(same for glans, dorsum of penis for men)

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8
Q

Embryology: Labia Minora origin?

A

Labia minora = Urogenital folds

(vental penile surface in males)

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9
Q

Embryology: labium majora origin?

A

Labium majum = labioscrotal swellings

(scrotum in males)

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10
Q

What are examples of midline fusion defects in women pelvic embryology?

A

Subseptate
Septate
Arcuate
Unicollis, bicornuate
Bicollis bicornuate
Utrine dedelphys (no fusion)
Vaginal septa
Rudimentary / noncommunicating horn

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11
Q

Cardiac embryology: in utero…
-is pulmonary artery high or low?

A

High pulmonary artery pressures –> to shunt blood away from lungs to the body
Left to right shunting

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12
Q

What are the shunts in utero and what happens at birth?

A

-Ductus venosus
-Ductus arteriosis

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13
Q

Where do the primary oocytes for the developing gonad derive from?

A

the yolk sac

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14
Q

Where / when does meiosis I/II begin?

A

Meiosis I = begins in utero
Meiosis II = begins at ovulation

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15
Q

Where / when does meiosis I/II arrest?

A

Meiosis I = arrests in prophase
Meiosis II = arrests in metaphase

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16
Q

Where / when does meiosis I/II end?

A

Meiosis I = ends pre-ovulation (at his point a secondary oocyte (23 X) plus 1st polar body is surrounded by zona pellucida and corona radiata (follicular cells)
Meiosis II = ends at fertilization

17
Q

In the developing oocyte, when is the haploid state accomplished?

A

Completion of meiosis I

18
Q

What is the order of development of the zygote?

A

Fertilization
Zygote
Cleavage
Morula
Blastocyst
Implantation

19
Q

What changes occur in the perinatal cardiovascular system at the time of birth?

A

-

ABOG (5 decks)

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