Learning Objectives

• Identify the gross-to-microscopic transition of the cerebrum, including the gyrus and sulcus.
• Distinguish between the neocortex (gray matter) and the underlying white matter.
• Recognize the meningeal layers protecting the cortical surface.
• Understand the laminar organization of the cerebral cortex and the limitations of H&E staining in visualizing specific layers.

Normal Histology: The Cerebral Cortex

The cerebrum is characterized by a highly organized outer layer of gray matter called the neocortex, which sits atop a core of myelinated white matter.

• The Gyrus: At low magnification, the section typically shows the crest of a gyrus. This folding increases the surface area of the brain for higher cognitive functions.
• Neocortex (Gray Matter): This region contains the cell bodies of neurons, interneurons, and glial cells. It is histologically organized into six distinct layers.
• H&E Staining Limitations: While the neocortex has six layers, they are often indistinct on standard Hematoxylin and Eosin (H&E) stains. Specialized stains (like Golgi or Nissl) are typically required to clearly differentiate them.
• White Matter: Located deep to the cortex (seen at the far right of the field), consisting of myelinated axons that transmit signals between different brain regions.
• Meninges: The protective connective tissue layers (pia mater, arachnoid, and dura mater) are found at the far left, covering the cortical surface.

High-Yield Neuroanatomy Quick Facts

Activity