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Parasubiculum

Parasubiculum 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 Parasubiculum rather than just read about it. In short: In the rodent, the parasubiculum is a retrohippocampal isocortical structure, and a major component of the subicular complex. It receives numerous subcortical and cortical inputs, and sends major projections to the superficial layers of the entorhinal cortex (Amaral & Witter, 1995).

Key takeaways

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

Reference excerpt

In the rodent, the parasubiculum is a retrohippocampal isocortical structure, and a major component of the subicular complex. It receives numerous subcortical and cortical inputs, and sends major projections to the superficial layers of the entorhinal cortex (Amaral & Witter, 1995). The parasubicular area is a transitional zone between the presubiculum and the entorhinal area in the mouse (Paxinos-2001), the rat (Swanson, 1998) and the primate (Zilles, 1990). Defined on the basis of cytoarchitecture, it is more similar to the presubiculum than to the entorhinal area (Zilles, 1990), however electrophysiological evidence suggests a similarity with the entorhinal cortex (Funahashi and Stewart, 1997; Glasgow & Chapman, 2007). To be specific, cells in this area are modulated by local theta rhythm, and display theta-frequency membrane potential oscillations (Glasgow & Chapman, 2007; Taube, 1995). Furthermore, cells in the parasubiculum, and neighboring presubiculum, fire in relation to the animal's location in space, suggesting properties similar to place cells. It is postulated that this area may play an integral role in spatial navigation and the integration of head-directional information (Chrobak & Buzsáki, 1994; Taube, 1995).

See also Brodmann area Subiculum

References Amaral, D. G., & Witter, M. P. (1995). "Hippocampal Formation". In G. Paxinos & C. Watson (Eds.), The rat brain in sterotaxic coordinates (3rd ed.). San Diego: Academic Press. Chrobak, J. J., & Buzsáki, G. (1994). "Selective activation of deep layer (V-VI) retrohippocampal cortical neurons during hippocampal sharp waves in the behaving rat". J Neurosci, 14(10), 6160–6170. Funahashi, M., & Stewart, M. (1997). "Presubicular and parasubicular cortical neurons of the rat: electrophysiological and morphological properties". Hippocampus, 1997;7(2):117-29. Glasgow, S. D., & Chapman, C. A. (2007). "Local generation of theta-frequency EEG activity in the parasubiculum". J Neurophys, doi:10.1152/jn.01306.2006. Taube, J. S. (1995). "Place cells recorded in the parasubiculum of freely moving rats". Hippocampus, 5(6), 569–583. Zilles, K., Wree, A., and Dausch, N. D. (1990) "Anatomy of the neocortex. Neurochemical organization", In: B.F. Kolb and R.C. Tees (eds.) The Cerebral Cortex of the Rat, 113–150. MIT Press, Cambridge.

External links For Neuroanatomy of this area visit BrainInfo

Worked examples

Example 1 — a first encounter with Parasubiculum

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

In research
Parasubiculum 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 Parasubiculum 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
Parasubiculum is common in secondary-school and first-year university syllabi. It links to neighbouring topics Brodmann areas, Neuroanatomy stubs, so understanding it makes those chapters shorter.
In everyday life
Look for Parasubiculum 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 Parasubiculum in 20 minutes

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

Frequently asked questions

What is Parasubiculum in simple terms?

In the rodent, the parasubiculum is a retrohippocampal isocortical structure, and a major component of the subicular complex. It receives numerous subcortical and cortical inputs, and sends major projections to the superficial layers of the entorhinal cortex (Amaral & Witter, 1995).

Why does Parasubiculum 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 Parasubiculum?

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 Parasubiculum.

Tags

  • Brodmann areas
  • Neuroanatomy stubs

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