biology

Subplate

Subplate 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 Subplate rather than just read about it. In short: The subplate, also called the subplate zone, together with the marginal zone and the cortical plate, in the fetus represents the developmental anlage of the mammalian cerebral cortex. It was first described, as a separate transient fetal zone by Ivica Kostović and Mark E.

Key takeaways

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

Reference excerpt

The subplate, also called the subplate zone, together with the marginal zone and the cortical plate, in the fetus represents the developmental anlage of the mammalian cerebral cortex. It was first described, as a separate transient fetal zone by Ivica Kostović and Mark E. Molliver in 1974. During the midfetal period of fetal development the subplate zone is the largest zone in the developing telencephalon. It serves as a waiting compartment for growing cortical afferents; its cells are involved in the establishment of pioneering cortical efferent projections and transient fetal circuitry, and apparently have a number of other developmental roles. The subplate zone is a phylogenetically recent structure and it is most developed in the human brain. Subplate neurons (SPNs) are among the first generated neurons in the mammalian cerebral cortex [1]. These neurons disappear during postnatal development and are important in establishing the correct wiring [2][3] and functional maturation [4] of the cerebral cortex. Subplate neurons appear to be selectively sensitive to injury (such as hypoxia) which in humans are associated with motor and cognitive defects [5]. Subplate neurons are the first cortical neurons to receive synaptic inputs from thalamic axons, establishing a temporary link between thalamic axons and their final target in layer IV.[6][7][8]Later, thalamic axons invade layer IV where they innervate layer IV neurons. In the visual system thalamic axons to layer IV form ocular dominance columns and this segregation of thalamic axons is impaired if subplate neurons are missing. [9][10]

See also Cerebral Cortex Cortical column Cerebral hemisphere ^Ghosh A, Shatz CJ (March 1992). "Involvement of subplate neurons in the formation of ocular dominance columns". Science. 255 (5050): 1441–3. doi:10.1126/science.1542795. PMID 1542795. ^Friauf E, McConnell SK, Shatz CJ (August 1990). "Functional synaptic circuits in the subplate during fetal and early postnatal development of cat visual cortex". J. Neurosci. 10 (8): 2601–13. doi:10.1523/JNEUROSCI.10-08-02601.1990. PMC 6570284. PMID 2388080. ^Rakic P (April 1977). "Prenatal development of the visual system in rhesus monkey". Philos. Trans. R. Soc. Lond. B Biol. Sci. 278 (961): 245–60. doi:10.1098/rstb.1977.0040. PMID 19781. ^Kostovic I, Rakic P (April 1980). "Cytology and time of origin of interstitial neurons in the white matter in infant and adult human and monkey telencephalon". J. Neurocytol. 9 (2): 219–42. doi:10.1007/BF01205159. PMID 7441294. ^McConnell SK, Ghosh A, Shatz CJ (September 1989). "Subplate neurons pioneer the first axon pathway from the cerebral cortex". Science. 245 (4921): 978–82. doi:10.1126/science.2475909. PMID 2475909. ^Kanold PO, Kara P, Reid RC, Shatz CJ (July 2003). "Role of subplate neurons in functional maturation of visual cortical columns". Science. 301 (5632): 521–5. doi:10.1126/science.1084152. PMID 12881571. ^McQuillen PS, Ferriero DM (July 2005). "Perinatal subplate neuron injury: implications for cortical development and plasticity". Brain Pathol. 15 (3): 250–60. doi:10.1111/j.1750-3639.2005.tb00528.x. PMC 8096042. PMID 16196392.

References

Illustrations

Worked examples

Example 1 — a first encounter with Subplate

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

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

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

Frequently asked questions

What is Subplate in simple terms?

Why does Subplate 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 Subplate?

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 Subplate.