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After fertilization the blastocyst develops three germ layers. Which germ layer is the innermost layer?


After fertilization the blastocyst develops three germ layers. Which germ layer is the innermost layer?

Step 1

In the human embryo , after about three days of fertilisation,the zygote forms a solid mass of cells called "morula ",which then subsequently changes into "blastocyst".

Step 2

Blastocyst consists of an outer layer called "trophoblast" and inner layer called "inner cell mass".

These two layers after some more divisions forms three layers ,Ectoderm (outermost layer), mesoderm(middle layer) and endoderm(innermost layer).

Step 3

Endoderm is the innermost l...

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Animal Physiology and Biochemistry

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