Page 128 - Veterinary Histology of Domestic Mammals and Birds, 5th Edition

110 Veterinary Histology of Domestic Mammals and Birds

Glial cells accompany axons along their entire length, pro-
· somatic efferent motor nerve fibres: transmit
VetBooks.ir · visceral afferent autonomic fibres and viding support and nutrition to the nerve fibre. They also
impulses to the periphery (skeletal striated muscle),
perform an important role in the transmission of neural
impulses, and thus it is functionally significant that the
· visceral efferent autonomic fibres: parasympathetic
and sympathetic involuntary nerve fibres that regu- cells surround the nerve process completely. Nerve fibres
late the function of the internal organs. that become invested in multiple concentric layers of glial
cell cytoplasm are referred to as myelinated fibres (Figure
5.14). In unmyelinated fibres, the nerve fibre occupies an
invagination in the glial cell cytoplasm.

5.11 Multipolar neuron of the central nervous system with glial cells (astrocytes and an oligodendrocyte)
(schematic).

5.12 Portion of the perikaryon of a multipolar neuron (top right) with surrounding neuropil (network of neu-
ronal and glial cell processes) (x9000).

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