Significance of Embryology
EMBRYOLOGY
WHAT IS EMBRYOLOGY?
The study of embryo and fetus is called embryology.
WHAT IS THE SIGNIFICANCE OF EMBRYOLOGY?
It tells us how life begins and what are events of development in the intrauterine life.
INTIAL STAGES OF EMBRYOLOGY BEFORE DEVELOPMENT
Gonades
Ovary in female Testis in Male
Oogenensis Spermatogenesis
Ovum (Haploid) Sperm (Haploid)
This process is called fertilization
Zygote (Dipliod)
Sex cell produced in GONADES.
Ovum: From the beginning of week-1 to the end of week-2 of gestation.
Embryology: From the beginning of week-3 to the end of week-8 of gestation.
Fetus: From the beginning of month-3 to the end of month-9 of gestation.
Gestation: period in the uterus between conception and birth.
DEVELOPMENT OF EMBRYO
There are three steps of embryology development.
1)- Cleavage ( first 2 weeks)
2)- Embryology Development (3rd to 8th week )
3)-Fetus Development(3rd month to 9th month)
CLEAVAGE: 1-Zygote undergoes a series of mitotic cell division.
2-Total mass does not increase but daughter cell increase in number.
3-Occure in zone pellucida.
EMBRYO DEVELOPMENT
Also called embryonic period.
1-Gastrulation: development of embryo comprise of a trilaminar germinal disc.
2- change in intraembryonic mesoderm i-Paraxial mesoderm: 35 pairs of somites are formed for determining age of embryo. ii-intermediate mesoderm: form urogenital ridge which is involved in formation of future kidney and gonads. iii- lateral mesoderm: two parts and covering yolk sac. iv-Notochord: it induce the formation of vertebral bodies. v- cardiogenic region: horseshoe shaped region of mesoderm. Involved in heart formation.
CHANGE IN ECTODERM
Involved in formation of future nervous system and
WHAT IS EMBRYOLOGY?
The study of embryo and fetus is called embryology.
WHAT IS THE SIGNIFICANCE OF EMBRYOLOGY?
It tells us how life begins and what are events of development in the intrauterine life.
INTIAL STAGES OF EMBRYOLOGY BEFORE DEVELOPMENT
Gonades
Ovary in female Testis in Male
Oogenensis Spermatogenesis
Ovum (Haploid) Sperm (Haploid)
This process is called fertilization
Zygote (Dipliod)
Sex cell produced in GONADES.
Ovum: From the beginning of week-1 to the end of week-2 of gestation.
Embryology: From the beginning of week-3 to the end of week-8 of gestation.
Fetus: From the beginning of month-3 to the end of month-9 of gestation.
Gestation: period in the uterus between conception and birth.
DEVELOPMENT OF EMBRYO
There are three steps of embryology development.
1)- Cleavage ( first 2 weeks)
2)- Embryology Development (3rd to 8th week )
3)-Fetus Development(3rd month to 9th month)
CLEAVAGE: 1-Zygote undergoes a series of mitotic cell division.
2-Total mass does not increase but daughter cell increase in number.
3-Occure in zone pellucida.
EMBRYO DEVELOPMENT
Also called embryonic period.
1-Gastrulation: development of embryo comprise of a trilaminar germinal disc.
2- change in intraembryonic mesoderm i-Paraxial mesoderm: 35 pairs of somites are formed for determining age of embryo. ii-intermediate mesoderm: form urogenital ridge which is involved in formation of future kidney and gonads. iii- lateral mesoderm: two parts and covering yolk sac. iv-Notochord: it induce the formation of vertebral bodies. v- cardiogenic region: horseshoe shaped region of mesoderm. Involved in heart formation.
CHANGE IN ECTODERM
Involved in formation of future nervous system and