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Law of Unequal Growth in Embryos

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Questions and Answers

What is the future site of the vertebral column?

Neural tube

Notochord (correct)

Primitive node

Neural crest

During neurulation, what signals overlying ectoderm for the formation of the spinal cord and brain?

Intermediate mesoderm

Neural groove

Notochord (correct)

Paraxial mesoderm

Which structure begins to differentiate lateral to the notochord around week 3?

Notochord

Neural tube

Intermediate mesoderm (correct)

Neural crest

At what stage does the closure of the neural tube begin?

End of week 3 (A) Signup and view all the answers

What cavity is formed by the split of the lateral plate mesoderm?

Coelom ('cavity') (A) Signup and view all the answers

What is formed by the division of mesoderm into three regions?

Somites (A) Signup and view all the answers

Which primary brain vesicle does the forebrain develop from?

Proencephalon (D) Signup and view all the answers

'Breach of cloacal membrane' occurs at which stage of development?

8th week (C) Signup and view all the answers

What process involves the formation of pronuclei, alteration of the ovum, and fusion of pronuclei during fertilization?

Fusion of pronuclei (B) Signup and view all the answers

Which structure proliferates and differentiates into two layers, including syncytiotrophoblast and cytotrophoblast?

Trophoblast (B) Signup and view all the answers

What characterizes the morula stage of development?

A ball of 16 or more cells resembling a mulberry (A) Signup and view all the answers

What does the primitive streak on the dorsal surface of the epiblast lead to?

Formation of mesoderm (B) Signup and view all the answers

During implantation, what disappears by the 5th day allowing the blastocyst to settle into the endometrium?

Zona pellucida (B) Signup and view all the answers