Various investigators have shown that unilateral ganglionectomy or transection
of the internal and external carotid nerves leads to a regenerative response in
the ipsilateral superior cervical ganglion and to uninjured mature sympathetic
neurons sprouting into bilaterally innervated shared target organs. In this study
changes in the supraependymal neuronal network following unilateral and bi-
lateral cervical sympathectomy on the infundibular floor of the third ventricle
were studied by scanning electron microscopy in comparison with normal and
sham-operated control animals. After unilateral cervical sympathectomy there
was a great increase in the number of varicose nerve fibres on the infundibular
floor as compared to the normal and sham-operated control animals. Not only
was there an increase in the number of nerve fibres, but also their varicosities
were substantially larger than those normally present on the ependymal surface.
This study indicates the possible sympathetic projections from the superior cer-
vical ganglia to the ependymal surface of the third cerebral ventricle.
Folia Morphol.
Vol. 66, No. 2, pp. 94–99
Copyright © 2007 Via Medica
ISSN 0015–5659
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