science

Stomodeum

Stomodeum 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 Stomodeum rather than just read about it. In short: The stomodeum, also called stomatodeum or stomatodaeum, is a depression between the brain and the pericardium in an embryo, and is the precursor to the mouth and the anterior lobe of the pituitary gland. Development The mouth is developed partly from the stomodeum, and partly from the floor of the anterior portion of the fore-gut.

Key takeaways

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

Reference excerpt

Development The mouth is developed partly from the stomodeum, and partly from the floor of the anterior portion of the fore-gut. By the growth of the head end of the embryo, and the formation of the cephalic flexure, the pericardial area and the buccopharyngeal membrane come to lie on the ventral surface of the embryo. With the further expansion of the brain, and the forward bulging of the pericardium, the buccopharyngeal membrane is depressed between these two prominences. This depression constitutes the stomodeum. No trace of the membrane is found in the adult; and the communication just mentioned must not be confused with the permanent isthmus faucium. The lips, teeth, and gums are formed from the walls of the stomodeum, but the tongue is developed in the floor of the pharynx.

History It is from the Greek stoma- (mouth) and odaios (likeness), "which looks like a mouth".

Additional images

References This article incorporates text in the public domain from page 1101 of the 20th edition of Gray's Anatomy (1918)

External links hednk-015a—Embryo Images at University of North Carolina

Illustrations

Worked examples

Example 1 — a first encounter with Stomodeum

Start with the simplest possible case. Write down what Stomodeum 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 Stomodeum 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 Stomodeum 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 Stomodeum

In research: Stomodeum 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 Stomodeum 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: Stomodeum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Embryology of digestive system, so understanding it makes those chapters shorter.
In everyday life: Look for Stomodeum 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 Stomodeum in 20 minutes

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

Frequently asked questions

What is Stomodeum in simple terms?

The stomodeum, also called stomatodeum or stomatodaeum, is a depression between the brain and the pericardium in an embryo, and is the precursor to the mouth and the anterior lobe of the pituitary gland. Development The mouth is developed partly from the stomodeum, and partly from the floor of the…

Why does Stomodeum 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 Stomodeum?

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 Stomodeum.