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Nervous system (systema nervosum) 383
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17.2 Lumbar region of the spinal cord in the cat (schematic).
The multipolar cells of the grey matter can be divided
into two groups: cells with axons that leave the spinal cord · interneurons that transmit impulses within spinal
via the ventral horn (fila radicularia) and form the ventral segments,
root (efferent neurons), and cells that communicate with · interneurons that cross the commissura grisea to the
other neurons within the central nervous system (spinal corresponding contralateral segment,
interneurons and projection neurons). · interneurons that divide into ascending and descend-
Efferent neurons may be somatic (from the ventral ing branches, acting ipsilaterally or contralaterally
horn) or autonomic (sympathetic and parasympathetic). upon efferent cells and
Interneurons and projection neurons are numerous in · projection neurons that send axons into the white
the dorsal horn and lateral intermediate substance. These matter and transmit impulses over long distances (as
can be subdivided as follows: far as the brain).
17.3 Transverse section of the spinal cord (sheep). Bodian stain (x8).
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