Figure 8­97
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The entire expanse of the dorsal and ventral horns of the cervical region of the spinal cord is illustrated here. The
Holdings,
arrow indicates the dorsal horn, which contains the cell bodies of small sensory neurons that relay information to the
brain from pain and temperature receptors in the skin. The sensory neurons in the dorsal root ganglia form synaptic
contacts with these secondary sensory neurons in the dorsal horn.
LLC.
Not
As we shall see, the width of the ventral horns changes as we proceed caudally through the cervical, thoracic,
to
lumbar, and sacral levels. In the cervical cord, shown here, the ventral horns reach their greatest development as
be
a result of the presence of large, multipolar motor neurons of the spinal cord. These ventral horn neurons innervate
redistributed
skeletal muscle fibers of the upper limb, back, and thorax musculature. Several ventral roots, with their complement
of myelinated nerve fibers, can be identified coursing through the white matter just ventral to the broad ventral
horn.
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