science

Reichert's membrane

Reichert's membrane is a science 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 Reichert's membrane rather than just read about it. In short: Reichert's membrane is an extraembryonic membrane that forms during early mammalian embryonic development. It forms as a thickened basement membrane to cover the embryo immediately following implantation to give protection to the embryo from the uterine pressures exerted.

Key takeaways

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

Reference excerpt

Reichert's membrane is an extraembryonic membrane that forms during early mammalian embryonic development. It forms as a thickened basement membrane to cover the embryo immediately following implantation to give protection to the embryo from the uterine pressures exerted. Reichert's membrane is also important for the maternofetal exchange of nutrients. The membrane collapses once the placenta has fully developed.

Structure Reichert's membrane is a multilayered, non-vascular, specialised thickened basement membrane that forms on the inner surface of the trophoblast around the time of implantation, and during the formation of the placenta. It is composed of an extracellular matrix that includes laminin, type IV collagen, and nidogen, and is secreted by embryonic cells in the distal parietal endoderm. The synthesis of laminin 111 in the embryo contributes to the formation of Reichert's membrane.

Function Reichert's membrane functions as a buffer space between the embryo and the decidua. This space provides protection to the embryo from varying uterine pressures exerted by smooth muscle contractions of the myometrium. During post gastrulation Reichert's membrane is necessary for the maternofetal exchange of nutrients. Reichert's membrane encloses the embryo until the amnion develops, and when the placenta is fully developed the membrane collapses. A major difference in the early formation of the mouse embryo, and that of the human embryo is that in the mouse following implantation the epiblast takes on an egg or cylindrical shape; in the human the epiblast forms into a horizontal, disc-shape the bilaminar disc. A study that looked at this morphological difference between a human embryo initial development and a mouse embryo, concluded that it is likely that Reichert's membrane is the key regulator of the epiblast's horizontal growth.

References

Worked examples

Example 1 — a first encounter with Reichert's membrane

Start with the simplest possible case. Write down what Reichert's membrane claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Reichert's membrane 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 Reichert's membrane 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 Reichert's membrane

In research: Reichert's membrane appears in science 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 Reichert's membrane 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: Reichert's membrane is common in secondary-school and first-year university syllabi. It links to neighbouring topics Embryology, so understanding it makes those chapters shorter.
In everyday life: Look for Reichert's membrane 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 Reichert's membrane in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Reichert's membrane 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 Reichert's membrane out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Reichert's membrane in simple terms?

Why does Reichert's membrane matter?

Because it connects several science 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 Reichert's membrane?

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 Reichert's membrane.