biology

Mammalian embryogenesis

Mammalian embryogenesis is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mammalian embryogenesis rather than just read about it. In short: Mammalian embryogenesis is the process of cell division and cellular differentiation during early prenatal development which leads to the development of a mammalian embryo. Difference from embryogenesis of lower chordates Due to the fact that placental mammals and marsupials nourish their developing embryos via the placenta, the ovum in these species does not contain significant amounts of yolk, and the yolk sac in…

Key takeaways

Mammalian embryogenesis belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mammalian embryogenesis to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mammalian embryogenesis from memory before moving on to harder problems.

Reference excerpt

Mammalian embryogenesis is the process of cell division and cellular differentiation during early prenatal development which leads to the development of a mammalian embryo.

Difference from embryogenesis of lower chordates

Due to the fact that placental mammals and marsupials nourish their developing embryos via the placenta, the ovum in these species does not contain significant amounts of yolk, and the yolk sac in the embryo is relatively small in size, in comparison with both the size of the embryo itself and the size of yolk sac in embryos of comparable developmental age from lower chordates. The fact that an embryo in both placental mammals and marsupials undergoes the process of implantation, and forms the chorion with its chorionic villi, and later the placenta and umbilical cord, is also a difference from lower chordates. The difference between a mammalian embryo and an embryo of a lower chordate animal is evident starting from blastula stage. Due to that fact, the developing mammalian embryo at this stage is called a blastocyst, not a blastula, which is more generic term. There are also several other differences from embryogenesis in lower chordates. One such difference is that in mammalian embryos development of the central nervous system and especially the brain tends to begin at earlier stages of embryonic development and to yield more structurally advanced brain at each stage, in comparison with lower chordates. The evolutionary reason for such a change likely was that the advanced and structurally complex brain, characteristic of mammals, requires more time to develop, but the maximum time spent in utero is limited by other factors, such as relative size of the final fetus to the mother (ability of the fetus to pass mother's genital tract to be born), limited resources for the mother to nourish herself and her fetus, etc. Thus, to develop such a complex and advanced brain in the end, the mammalian embryo needed to start this process earlier and to perform it faster. Another difference is that during the development of embryonic genitourinary tract, in case of female embryo of placental and marsupial mammals, the uterus is formed, a structure that neither monotremata nor lower chordates have. In every case, including monotremata embryos, the milk glands also develop.

Difference from human embryogenesis

Most mammals develop similarly to humans; during the earliest stages of development, the embryo is largely indistinguishable from another mammal. However, there are phenomena found in human beings not found in all other mammals, as well as phenomena occurring in other mammals, but not in humans.

Humans Mammals do not have the same human chorionic gonadotropin released from their embryo.

Non-human mammals The anatomy of the area surrounding an embryo or fetus is different in litter-bearing animals compared to humans: each unborn animal is surrounded by placental tissue and is lodged along one of two long uterine horns rather than in the center of the pear-shaped uterus found in a human female.

See also Embryogenesis Mammalian Parthenogenesis Drosophila embryogenesis Plant embryogenesis Developmental biology Blastomere Morula Cdx2

References

External links Photo of blastocyst in utero

Worked examples

Example 1 — a first encounter with Mammalian embryogenesis

Start with the simplest possible case. Write down what Mammalian embryogenesis claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mammalian embryogenesis before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mammalian embryogenesis ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mammalian embryogenesis

In research: Mammalian embryogenesis appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mammalian embryogenesis in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mammalian embryogenesis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Animal developmental biology, so understanding it makes those chapters shorter.
In everyday life: Look for Mammalian embryogenesis outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Mammalian embryogenesis in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mammalian embryogenesis means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mammalian embryogenesis out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mammalian embryogenesis in simple terms?

Mammalian embryogenesis is the process of cell division and cellular differentiation during early prenatal development which leads to the development of a mammalian embryo. Difference from embryogenesis of lower chordates Due to the fact that placental mammals and marsupials nourish their developin…

Why does Mammalian embryogenesis matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mammalian embryogenesis?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mammalian embryogenesis.