biology

Posterolateral palatal pits

Posterolateral palatal pits 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 Posterolateral palatal pits rather than just read about it. In short: In anatomy, posterolateral palatal pits are gaps at the sides of the back of the bony palate, near the last molars. Posterolateral palatal pits are present, in various degrees of development, in several members of the rodent family Cricetidae.

Key takeaways

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Connect Posterolateral palatal pits to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Posterolateral palatal pits from memory before moving on to harder problems.

Reference excerpt

In anatomy, posterolateral palatal pits are gaps at the sides of the back of the bony palate, near the last molars. Posterolateral palatal pits are present, in various degrees of development, in several members of the rodent family Cricetidae. Many members of the family lack them or have only simple pits, but Arvicolinae (voles, lemmings, and relatives) and Oryzomyini (rice rats and relatives) have more highly developed posterolateral palatal pits. Posterolateral palatal pits are also present in some other rodents, including Glis, Jaculus, Hystrix, Abrocoma, Ctenomys, Chinchilla, and Lagidium.

Sigmodontinae

Many members of the mainly South American cricetid subfamily Sigmodontinae have posterolateral palatal pits. In Oryzomyini (rice rats), the largest tribe of the Sigmodontinae, all but some species—Mindomys hammondi and Sigmodontomys aphrastus usually have only one small pit on each side of the palate—have prominent posterolateral palatal pits, often more than one on each side of the palate. In many oryzomyines, the pits are located in a deep depression or fossa. This depression has been termed the "palatal fossa" in the genus Cerradomys; its varying depth serves as a diagnostic character separating some of the species. The presence of complex posterolateral palatal pits is a synapomorphy either of Oryzomyini or of Oryzomyini minus Mindomys. Members of the genus Nephelomys usually have complex posterolateral palatal pits, recessed into deep fossae, but N. caracolus and N. nimbosus have simpler pits. One of the putative subdivisions within Oryzomyini, Clade D, has posterolateral palatal pits recessed into a fossa as one of its synapomorphies, although the feature is reversed in several subgroups. The extinct island endemic Noronhomys vespuccii also had smaller pits, perhaps because of its short palate. Among members of the tribe Thomasomyini, posterolateral palatal pits are small or absent. Aepeomys lacks them, but Rhagomys longilingua does have posterolateral palatal pits. The possible thomasomyine Abrawayaomys chebezi has small posterolateral palatal pits. Members of the Phyllotini tribe always have posterolateral palatal pits. In some species, they are displaced to the back from their usual position just before the mesopterygoid fossa into the fossa. The condition of the pits has been used to separate species of Phyllotis. The tribe Ichthyomyini is characterized by inconspicuous posterolateral palatal pits.

Arvicolinae Arvicolinae, a group that includes the voles and lemmings, usually have posterolateral palatal pits, but the configuration of the pits is variable. In some species, the pits do not extend to the ventral face of the palate.

Neotominae Posterolateral palatal pits are poorly developed or absent in many members of the mostly North American subfamily Neotominae, including Peromyscus (deer mice) and related genera.

Cladistics The presence and development of posterolateral palatal pits has been used as a character in cladistic analyses of oryzomyines by Weksler (2006), Carleton and Olson (1999), and Carleton and Musser (1989); neotomines by Carleton (1980); and phyllotines by Steppan (1995).

References

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Worked examples

Example 1 — a first encounter with Posterolateral palatal pits

Start with the simplest possible case. Write down what Posterolateral palatal pits 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 Posterolateral palatal pits 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 Posterolateral palatal pits 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 Posterolateral palatal pits

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

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Frequently asked questions

What is Posterolateral palatal pits in simple terms?

Why does Posterolateral palatal pits 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 Posterolateral palatal pits?

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 Posterolateral palatal pits.