Abstract：
:The distribution of degeneration in the vestibular nuclei (VN) has been studied in transversely cut sections from 9 cats with stereotaxically performed lesions in the main reticular formation (RF) of the brain stem (Nauta of Fink and Heimer method). No projection was found from the mesencephalic reticular formation (R.mes.) and nucleus reticularis ventralis (R.v.). However, the reticular nuclei gigantocellularis (R.gc.), parvocellularis (R.p.c.) and pontis oralis (R.p.o.) were found to project bilaterally onto the 4 main vestibular nuclei with an ipsilateral overweight. By far the greates contribution comes from the R.gc. and R.p.c. In cases with R.gc. lesions some degeneration was found in the small cell groups x and f. The latter is also supplied from the R.p.c. The distribution of degeneration within the vestibular complex is rather diffuse, but a certain pattern can be discovered. After R.p.c. lesions the maximal terminal field in the VN is found within the superior nucleus, while the lateral and medial nuclei are preferred sites of termination of fibers from R.gc. and R.p.c. The projections of the R.gc. and the R.p.c. may be more different than appears from our findings since lesions of one of them will most likely have affected some ascending or descending fibers emanating from the other. Since the areas of RF projecting to VN receive afferents from many sources, these sources have possibilities to act on the VN even if they do not possess direct connections with this nuclear complex. These possibilities should be remembered in physiological studies of responses in the VN following stimulation of many parts of the CNS.
journal_name
Brain Resjournal_title
Brain researchauthors
Hoddevik GH,Brodal A,Walberg Fdoi
10.1016/0006-8993(75)90224-3subject
Has Abstractpub_date
1975-09-05 00:00:00pages
383-99issue
3eissn
0006-8993issn
1872-6240pii
0006-8993(75)90224-3journal_volume
94pub_type
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