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What is structure function and importance of extraembryonic membranes?
MuhammadAfzalHamid
Extra-embryonic membranes include Chorion , Amnion , Allontois and Yolk sac . They are formed in Amniotes including Reptiles , Birds and Mammals . They are formed only during development and are of essential for development of Amniotes .
1 : Chorion : It is outermost extra-embryonic membrane . It is formed by ectoderm and mesoderm . Its major function is protection in reptiles and birds . In mammals it helps in formation of Placenta and umbilical cord along with allontois .
2 : Amnion: It is made up of mesoderm and ectoderm . It contains amniotic fluid for protection which acts as shock absorber . It has evolutionary significance .
3 : Allontois; It is made up of endoderm and ectoderm .In reptiles and birds it helps in respiration and excretion . In mammals it helps in formation of umbilical cord .
4 Yolk Sac : It is made up of endoderm and ectoderm . It is more important in reptiles and birds as it protects yolk . In mammals it is not important
Placenta in mammals help in nutrition respiration and excretion .
Wiki User
∙ 9y ago
Wiki User
∙ 9y agoExtraembryonic Membranes are layers of tissue surrounding a developing embryo.
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