Page 385 - Atlas of Histology with Functional Correlations

unmyelinated and myelinated axons (5, 10). The satellite cells (3, 8), in turn, are

surrounded by an outer layer of capsule cells (7) of the connective tissue.
Between the unipolar neurons (1, 6) are fibrocytes (2) randomly arranged in the
connective tissue and continue into the endoneurium between the axons (5).

With hematoxylin and eosin stain, small axons and individual connective
tissue fibers are not defined. Large myelinated axons (5) are recognizable when

sectioned longitudinally.

FIGURE 9.30 ■ Cells and unipolar neurons of a dorsal root ganglion. Stain:

hematoxylin and eosin. High magnification.

FIGURE 9.31 | Multipolar Neurons, Surrounding

Cells, and Nerve Fibers of Sympathetic Ganglion

In contrast to the neurons of the dorsal root ganglion (Fig. 9.30), the neurons (3,
9) of the sympathetic trunk are multipolar, smaller, and more uniform in size. As
a result, the outlines of the neurons (3, 9) and their dendritic processes (2, 11)

appear irregular. Also, if the plane of section does not pass through the middle of
the neuron, only the cytoplasm (1, 10) is visible. The sympathetic neurons (3, 9)
also often exhibit eccentric nuclei (9), and binucleated cells are not uncommon.

In older individuals, a brownish lipofuscin pigment (12) accumulates in the
cytoplasm of neurons (1, 10, 12).

The satellite cells (8) surround the multipolar neurons (3, 9) but are less
numerous than around the neurons in the dorsal root ganglion. Also, the
connective tissue capsule with its capsule cells may not be well defined.

Surrounding the neurons (3, 9) are fibrocytes (5) of the intercellular connective
tissue and blood vessels such as a venule with blood cells (6). Unmyelinated and
myelinated nerve axons (4, 7) aggregate into bundles and course through the
sympathetic ganglion. The flattened nuclei on the peripheries of the myelinated

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