Specimen:

SPECIMEN DETAILS:

Organ: Cerebellum
Source: Human
Staining: Hematoxylin and Eosin (H&E)

METHOD AND SPECIMEN DESCRIPTION:

This is a normal section of the adult human cerebellum, stained with Hematoxylin and Eosin (H&E).

• Hematoxylin stains cell nuclei blue, highlighting chromatin and nucleoli.
• Eosin stains cytoplasm and extracellular matrix pink to red.

Only a small portion of the cerebellum is visible in the section, as the organ’s overall size and folding pattern prevent inclusion of the entire structure on a single slide.

OBJECTIVE OF THE EXAMINATION:

To study the layered structure of the cerebellar cortex and recognise the main neuronal and glial cell types.

Special Features of the Specimen:

The cerebellum forms numerous densely packed folds (folia), which together produce the characteristic arbor vitae or “tree of life” appearance in cross-section.

At medium magnification, a clear distinction between the cortex and the underlying white matter (medulla) can be observed.

Cerebellar Cortex:

The cerebellar cortex is three-layered, arranged as follows (from superficial to deep):

1. Molecular layer –
   • Contains loosely arranged neurons, primarily stellate cells (superficially) and basket cells (near the Purkinje cell layer).
   • Rich in unmyelinated axons and dendritic arbors of Purkinje cells.
2. Ganglionic (Purkinje cell) layer –
   • A single row of large Purkinje cell bodies, each with a distinctive flask-shaped soma.
   • Primary dendrites extend into the molecular layer and form elaborate arborizations.
3. Granular layer –
   • Densely packed with small granule cells, whose axons ascend to the molecular layer, forming parallel fibers.
   • Larger Golgi cells are scattered near the Purkinje cell layer.
   • Bergmann glial cells, whose somata lie near the Purkinje cells, are present but not clearly distinguishable in H&E preparations.

White Matter:

• Appears paler due to dissolution of myelin during processing.
• Contains axons of Purkinje cells, as well as the cell bodies of oligodendrocytes, astrocytes, and endothelial cells.

TASKS:

• To which structures do the Purkinje cells project?
• From where do the moss fiber afferents reach the granule cells?
• From where do the climbing fiber afferents reach the Purkinje cells?
• Approximately how many granule cells are present in the human cerebellum?

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