Abstract
The vestibular nuclear complex (VNC) is classically divided into four nuclei on the basis of cytoarchitectonics. However, anatomical data on the distribution of afferents to the VNC and the distribution of cells of origin of different efferent pathways suggest a more complex internal organization. Immunoreactivity for calcium-binding proteins has proven useful in many areas of the brain for revealing structure not visible with cell, fiber or Golgi stains. We have looked at the VNC of the cat using immunoreactivity for the calcium-binding proteins calbindin, calretinin and parvalbumin. Immunoreactivity for calretinin revealed a small, intensely stained region of cell bodies and processes just beneath the fourth ventricle in the medial vestibular nucleus. A presumably homologous region has been described in rodents. The calretinin-immunoreactive cells in this region were also immunoreactive for choline acetyltransferase. Evidence from other studies suggests that the calretinin region contributes to pathways involved in eye movement modulation but not generation. There were focal dense regions of fibers immunoreactive to calbindin in the medial and inferior nuclei, with an especially dense region of label at the border of the medial nucleus and the nucleus prepositus hypoglossi. There is anatomical evidence that suggests that the likely source of these calbindin-immunoreactive fibers is the flocculus of the cerebellum. The distribution of calbindin-immunoreactive fibers in the lateral and superior nuclei was much more uniform. Immunoreactivity to parvalbumin was widespread in fibers distributed throughout the VNC. The results suggest that neurochemical techniques may help to reveal the internal complexity in VNC organization.
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Abbreviations
- BC:
-
brachium conjunctivum
- BP:
-
brachium pontis
- CD:
-
dorsal cochlear nucleus
- CGL:
-
cochlear granular layer
- CUR:
-
cuneate nucleus, rostral division
- CVA:
-
ventral cochlear nucleus
- CX:
-
external cuneate nucleus
- DMV:
-
dorsal motor nucleus of the vagus
- FTG:
-
gigantocellular tegmental field of the reticular formation
- FTL:
-
lateral tegmental field of the reticular formation
- INT:
-
nucleus intercalatus
- MLF:
-
medial longitudinal fasciculus
- PT:
-
pyramidal tract
- PH:
-
nucleus prepositus hypoglossi
- RB:
-
restiform body
- S:
-
solitary tract
- SA:
-
stria acoustica
- SM:
-
medial nucleus of the solitary tract
- TB:
-
trapezoid body
- VIN:
-
inferior vestibular nucleus
- VLD:
-
lateral vestibular nucleus, dorsal division
- VLV:
-
lateral vestibular nucleus, ventral division
- VMN:
-
medial vestibular nucleus
- VNC:
-
vestibular nuclear complex
- VSL:
-
superior vestibular nucleus, lateral division
- VSM:
-
superior vestibular nucleus, medial division
- 5P:
-
principal sensory trigeminal nucleus
- 5SM:
-
alaminar spinal trigeminal nucleus, magnocellular division
- 5ST:
-
spinal trigeminal tract
- 6:
-
sixth cranial nerve nucleus
- 7N:
-
seventh cranial nerve
- 7G:
-
genu of the seventh cranial nerve
- 8N:
-
eighth cranial nerve
- 12:
-
twelfth cranial nerve nucleus
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Acknowledgements
Supported by NIH grants R01 EY07342 and DC01559. We thank Dr. Wade Sigurdson for use of, and help with, the confocal microscope. We thank Dr. Enrico Mugnaini for use of the Nikon microscope and camera.
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Baizer, J.S., Baker, J.F. Immunoreactivity for calcium-binding proteins defines subregions of the vestibular nuclear complex of the cat. Exp Brain Res 164, 78–91 (2005). https://doi.org/10.1007/s00221-004-2211-8
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DOI: https://doi.org/10.1007/s00221-004-2211-8