Embryogenesis

The cluster of cells arising after fertilization is called
1. morula
2. mulberry
3. blastula
Cavity in the embryo arises
1. fourth day after fertilization
2. tenth day after fertilization
3. twentieth day after fertilization
When is the vesicle nestled into the uterine lining?
1. after three weeks
2. after three days
3. after three months
What does not belong to the tissues?
1. skin
2. nervous
3. muscle
From tissues arise
1. organs
2. organ systems
3. cells
External embryonic leaf or
1. ectoderm
2. entoderm
3. mesoderm
Internal embryonic leaf or
1. entoderm
2. ectoderm
3. mesoderm
From ectoderm does not arise
1. liver
2. skin
3. nervous system
From ectoderm arises
1. pancreas
2. nervous system
3. muscles
From mesoderm does not arise
1. skin
2. skeleton
3. heart