Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a...
-
Upload
loreen-king -
Category
Documents
-
view
229 -
download
0
Transcript of Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a...
![Page 1: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/1.jpg)
Exercise 46
Embryonic Development
![Page 2: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/2.jpg)
Developmental stages of humans
Fertilization Zygote
It is a fertilized egg Diploid (2n)Female pronucleiMale pronucleiAmphimixis
![Page 3: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/3.jpg)
Developmental stages of humans
Zona pellucidaSurrounds the zygoteDisappears when the blastocyst
reaches the uterine cavity Corona radiata
Granulosa cells surrounding the zona pellucicda
Disappears after fertilization
![Page 4: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/4.jpg)
Fertilization
![Page 5: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/5.jpg)
Developmental stages of humans
Cleavage Stages of the Cleavage
Blastomere Early cleavage
4-cells stage… Morula
16-32 cells stage
![Page 6: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/6.jpg)
Developmental stages of humans
BlastocystCentral cavity appears – blastocystic
cavityInner cell mass (ICM) – forms the embryoTrophoblast – nourishes the developing
embryo Final product of cleavage
![Page 7: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/7.jpg)
Developmental stages of humans Implantation
From day 7 to day 10 after the ovulation
The blastocyst will go from a floating stage to a complete implanted stage in the uterus
![Page 8: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/8.jpg)
Developmental stages of humans Gastrulation The ICM will develop into three
primary germ layersEctoderm
• Forms the epithelia and nervous system
![Page 9: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/9.jpg)
Developmental stages of humans
Mesoderm• Forms everything between the
ectoderm and the endodermEndoderm
• Forms the mucosa of the digestive and respiratory tract, etc
![Page 10: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/10.jpg)
Endometrium will form the deciduas
Deciduas basalis-part of the endometrium beneath the ICM. It will form the maternal portion of the placenta
Deciduas capsularis – it is the rest of the endometrium surrounding the blastocyst.
![Page 11: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/11.jpg)
Developmental stages
![Page 12: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/12.jpg)
Developmental stages of humans Embryo
Until the 8th week Fetus
From 8th week to birth Trophoblast
Will develop villiWill differentiate into the chorion that
will form the fetal portion of the placenta
![Page 13: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/13.jpg)
Developmental stages of humans
PlacentaChorionic villi + decidua basalis
Embryonic membranes (from the ICM)Amnion
• Encases the embryo• Amniotic cavity
• Amniotic fluid
![Page 14: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/14.jpg)
Developmental stages
![Page 15: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/15.jpg)
Developmental stages of humans
Yolk sac• Originates the embryo’s first blood
cellsAllantois
• Body stalk and later umbilical cord• Umbilical cord attaches the
embryo to the placenta
![Page 16: Exercise 46 Embryonic Development. Developmental stages of humans Fertilization Zygote It is a fertilized egg Diploid (2n) Female pronuclei Male pronuclei.](https://reader035.fdocuments.net/reader035/viewer/2022062314/56649ede5503460f94bef03d/html5/thumbnails/16.jpg)
In uterus development
PlacentaFetal side
• Shine and smooth• Presence of large blood vessels
Maternal side• Spongy, torn-looking, rough