Embark on a Journey into Embryology

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Questions and Answers

During fission, how long does it take for the zygote to complete its mitotic divisions?

Within 30 hours (correct)
Within 24 hours
Within 12 hours
Within 48 hours

What happens to the number of blastomeres during the morula stage?

It decreases
It becomes irregular
It remains the same
It increases (correct)

What is the role of the larger central blastomeres during the morula stage?

Form the placenta
Form the embryoblast (correct)
Form the trophoblast
Form the corona radiata

What happens four days after fertilisation?

<p>Blastocyst genesis begins (A)</p> Signup and view all the answers

What happens to the size of the blastomeres during the morula stage?

<p>They become smaller (B)</p> Signup and view all the answers

Flashcards

Zygote division time

Within 30 hours, the zygote undergoes rapid cell division to form a ball of cells.

Blastomeres in the morula

The number of cells in the morula increases significantly as the zygote continues to divide.

Role of large blastomeres

These larger cells will contribute to the embryo's inner cell mass, which will later develop into the embryo itself.

Blastocyst genesis

The morula transitions into a blastocyst, a hollow sphere of cells with an inner cell mass.

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Blastomere size in morula stage

As the morula stage progresses, the cells, or blastomeres, decrease in size.

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Study Notes

Fission and Zygote Development

The zygote completes its mitotic divisions in approximately 24 to 30 hours after fertilization.

Morula Stage Dynamics

During the morula stage, the number of cells called blastomeres increases as the zygote divides without increasing in size.
The larger central blastomeres play a crucial role in forming the inner cell mass, which eventually develops into the embryo.

Embryo Development Timeline

Four days after fertilization, the morula stage transitions into the blastocyst stage, wherein the embryo begins to prepare for implantation into the uterine wall.

Blastomere Size Changes

During the morula stage, while the number of blastomeres increases, their individual size decreases due to the rapid mitotic divisions without corresponding growth.

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Description

Test your knowledge on general embryology with this quiz! Learn about fission of the zygote, mitotic divisions, blastomere, morula stage, and more. Presented by Vlad Vunvulea, MD, PhD.