science

Interparietal bone

Interparietal bone 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 Interparietal bone rather than just read about it. In short: An interparietal bone (os interparietale or Inca bone or os inca var.) is a dermal bone situated between the parietal and supraoccipital. It is homologous to the postparietal bones of other animals.

Key takeaways

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

Reference excerpt

An interparietal bone (os interparietale or Inca bone or os inca var.) is a dermal bone situated between the parietal and supraoccipital. It is homologous to the postparietal bones of other animals.

In humans In humans, it corresponds to the upper portion of the squama of the occipital bone that lies superior to the highest nuchal line and is completely fused to the supraoccipital. However, in some individuals this portion remains separate from the rest of the occipital bone throughout life. In such cases, this separate bone is particularly referred as Inca bone. Inca bones in humans were first found in the skulls of contemporary indigenous peoples of the southern Andes as well as in those of mummies of the Inca civilization. Although the Inca bone was originally encountered as a variation in South American and Latin American cranial remains, the variation occurs in people from all geographic regions of the world and is by no means indicative of South/Latin American origin. The existence of this Inca bone has helped to identify the mummified remains which spent 110 years in two German museums as belonging to a young South American woman who was probably a victim of ritual murder practiced around the 17th century.

In other animals In many other mammals, this bone is completely fused to the supraoccipital as in humans. However in some mammals (for example, rodents, rabbits, and artiodactyls), this bone remains separate from the supraoccipital bone. Classically, comparative anatomists have regarded the interparietal as being lost in various mammalian lineages since the interparietal and supraoccipital fuse with each other in the early ontogenetic period in many mammals, but a 2012 study has shown that its presence is confirmed in all extant mammalian orders, particularly in the embryonic period. The homology of the interparietal and its relation to other bones of the skull roof nevertheless remains enigmatic; specifically, in cetaceans, the identity of the posterior interparietals and the so-called "anterior middle interparietal" is the subject of debate.

Illustrations

Worked examples

Example 1 — a first encounter with Interparietal bone

Start with the simplest possible case. Write down what Interparietal bone 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 Interparietal bone 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 Interparietal bone 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 Interparietal bone

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

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

Frequently asked questions

What is Interparietal bone in simple terms?

An interparietal bone (os interparietale or Inca bone or os inca var.) is a dermal bone situated between the parietal and supraoccipital. It is homologous to the postparietal bones of other animals.

Why does Interparietal bone 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 Interparietal bone?

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 Interparietal bone.