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Embriology glossary > Glossary > Flashcards

Flashcards in Glossary Deck (30)
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1
Q

polyspermy

A

polyspermy The condition of (an egg) being fertilized by more than one sperm

2
Q

dispermy

A

dispermy The condition of (an egg) being fertilized by two sperm

3
Q

zygote

A

zygote Fertlized egg

4
Q

morula

A

morula (from L for mulberry) a preimplantation embryo with 8-32 cells

5
Q

blastocyst

A

A preimplantation embryo with inner cell mass, trophectoderm and blastocoele (similar to the blastula of other species)

6
Q

blastocoele

A

blastocoele The fluid filled-cavity of a blastocyst

7
Q

inner cell mass

A

inner cell mass The inner cells of a blastocyst. It will give rise to the embryo, fetus and adult

8
Q

trophectoderm

A

trophectoderm The outer cells of a blastocyst. It will only give rise to placental tissues.

9
Q

conceptus

A

conceptus The products of fertiization, including embryo and placenta

10
Q

organogenesis

A

organogenesis The process of generating organs in the early embryo

11
Q

embryo

A

embryo Prior to completion of organogenesis, the portion of the conceptus which will give rise to the fetus and adult

12
Q

fetus

A

fetus After organogenesis, the portion of the conceptus which will give rise to the adult

13
Q

implantation

A

implantation The attaching and invasion of the endometrium by the blastocyst

14
Q

hypoblast

A

hypoblast Derived from the inner cell mass, one of the two layers of the bilaminar embryo. Gives rise to yolk sac endoderm

15
Q

epiblast

A

epiblast A derivative of the inner cell mass, one of the two layers of the bilaminar embryo. Gives rise to amniotic ectoderm, primordial germ cells and the

16
Q

amnion

A

amnion The membrane surrounding the amniotic cavity dorsad to the epiblast.

17
Q

amniotic cavity

A

The fluid filled cavity originally bounded by the amniotic ectoderm and the epiblast or ectoderm

18
Q

primordial germ cells

A

primordial germ cells The germ cells from the time when they first form from the epiblast until the time when they enter the somatic gonad several days later

19
Q

yolk sac

A

yolk sacThe membrane surrounding the yolk sac cavity, composed of yolks sac endoderm and yolk sac mesoderm.

20
Q

yolk sac cavity

A

yolk sac cavity: The fluid filled cavity originally bounded by the yolk sac endoderm and the hypoblast or endoderm

21
Q

cytotrophoblast

A

cytotrophoblast Diploid cell layer derived from the trophoblast

22
Q

syncytiotrophoblast

A

syncytiotrophoblast A polyploid tissue derived from the trophoblast arising from cell fusion.

23
Q

extraembryonic mesoderm

A

extraembryonic mesoderm Mesoderm in the placenta, external to the embryo. Its prescuror tissue in humans is not certain. Gives rise to amniotic and yolk sac mesoderm, connecting stalk, parts of chorion.

24
Q

chorion

A

chorion The outer membrane of the conceptus, consisting of cytotrophoblast, syncytiotrophoblast and extra-embryonic mesoderm

25
Q

chorionic cavity

A

chorionic cavity. A large fluid-filled cavity in the extra-embryonic mesoderm later obliterated by expansion of the amnion

26
Q

connecting stalk

A

connecting stalk: The connection between the chorion and the remainder of the conceptus which suspends it in the chorionic cavity. Derives from extra-embryonic
mesoderm and contirbutes to the umbiliicus.

27
Q

monozygotic

A

Of twins originating from one zygote (identical twins)

28
Q

dizygotic

A

Of twins originating from two zygotes (fraternal twins)

29
Q

hydatidiform mole

A

hydatidiform mole An abnormal conceptus consisting almost exclusively of chorionic tissue

30
Q

ectopic

A

ectopic In the wrong place, as in ectopic implantation or pregnancy