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Related Experiment Videos

Entorhinal cortex modules of the human brain

A Solodkin1, G W Van Hoesen

  • 1Department of Anatomy, University of Iowa College of Medicine, Iowa City 52242, USA. solodkin@blue.weeg.uiowa.edu

The Journal of Comparative Neurology
|February 19, 1996
PubMed
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Researchers identified unique modular structures in the human entorhinal cortex (Brodmann's area 28). These modules, distinct from sensory areas, are disrupted in Alzheimer's disease, potentially explaining memory loss severity.

Area of Science:

  • Neuroscience
  • Neuroanatomy

Background:

  • Modular organization is well-established in primary sensory cortices.
  • Demonstrating modularity in other cortical areas, like the entorhinal cortex, has been challenging.

Purpose of the Study:

  • To investigate the existence and characteristics of unique modular organization in the human entorhinal cortex (Brodmann's area 28).

Main Methods:

  • Utilized classic cyto- and myeloarchitectonic stains.
  • Employed immunolabeling for neurochemicals and histochemistry for enzymes.
  • Examined neuropathology in Alzheimer's disease cases.

Main Results:

  • Identified the human entorhinal cortex as a mosaic of cellular aggregates, including layer II cell islands and surrounding myelinated fibers.

Related Experiment Videos

  • Observed distinct patterns in glutamic acid decarboxylase-positive neurons, cytochrome oxidase staining, and cholinergic afferent fibers.
  • Found that Alzheimer's disease pathology inversely highlights these modules by destroying their features.

    • Conclusions:

    • Anatomically defined modules exist in the entorhinal cortex, expanding knowledge beyond sensory and motor areas.
    • These morphological modules likely correspond to specific functional roles within the entorhinal cortex.
    • The destruction of these modules may disproportionately contribute to memory impairments in Alzheimer's disease.