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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
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Sequential pattern of sublayer formation in the paleocortex and neocortex.

Makoto Nasu1, Kenji Shimamura2, Shigeyuki Esumi3

  • 1Department of Morphological Neural Science, Graduate School of Medical Sciences, Kumamoto University, 1-1-1, Honjo, Chuo-ku, Kumamoto, 860-8556, Japan. mnas@kumamoto-u.ac.jp.

Medical Molecular Morphology
|February 1, 2020
PubMed
Summary
This summary is machine-generated.

Researchers investigated gene expression in the piriform cortex, the brain's smell center. They discovered distinct sublayers in its structure, revealing similarities and differences in development compared to the neocortex.

Keywords:
Brn1/Pou3f3Ctip2/Bcl11bPiriform cortex (paleocortex)Sequential expressionSublayer

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Olfactory System Research

Background:

  • The piriform cortex, or paleocortex, is the brain's primary olfactory processing center, receiving input from the olfactory bulb.
  • Unlike the six-layered neocortex, the piriform cortex has a three-layered structure, and its developmental regulatory mechanisms are less understood.
  • Understanding piriform cortex development is crucial for insights into olfactory information processing and brain evolution.

Purpose of the Study:

  • To investigate the expression of neocortical layer-specific genes within the piriform cortex.
  • To compare the regulatory mechanisms of piriform cortex development with those of the neocortex.
  • To elucidate the structural organization and gene expression patterns underlying piriform cortex formation.

Main Methods:

  • Examined the expression patterns of specific genes, including Ctip2/Bcl11b and Brn1/Pou3f3, in the piriform cortex.
  • Utilized techniques to analyze gene expression and identify distinct cellular layers or sublayers.
  • Compared gene expression sequences and laminar arrangements with known neocortical development.

Main Results:

  • Identified two distinct sublayers within layer II of the piriform cortex.
  • Observed a sequential gene expression pattern of Ctip2 and Brn1 in the piriform cortex, mirroring that of the neocortex.
  • Found that the laminar arrangement in the piriform cortex follows an 'outside-in' developmental pattern, contrasting with the neocortex.

Conclusions:

  • The piriform cortex exhibits specific sublayer organization and gene expression dynamics during development.
  • Similarities in sequential gene expression suggest conserved regulatory mechanisms between the piriform cortex and neocortex.
  • Differences in laminar arrangement highlight unique developmental pathways in the olfactory cortex, offering new avenues for research.