Vibrissae representation in subcortical trigeminal centers of the neonatal rat
- 15 January 1979
- journal article
- research article
- Published by Wiley in Journal of Comparative Neurology
- Vol. 183 (2), 305-321
- https://doi.org/10.1002/cne.901830207
Abstract
In the neonatal rat differential activity levels of the metabolic enzyme succinic dehydrogenase (SDH) reveal intricately detailed segmentation in the neuropil of the spinal and principal trigeminal nuclei of the brainstem and in the ventrobasal complex of the thalamus. The segmentation occurs in the portions of these nuclei that electrophysiological evidence has indicated to be related to the mystacial vibrissae and sinus hairs on the face of the rat. Indeed, the pattern of segmentation in each nucleus replicates the topographic distribution of the vibrissae and sinus hairs. Further, within the spinal trigeminal nucleus, there appear to be two distinct representations of the vibrissae, one in the subnucleus caudalis and a second in the subnucleus interpolaris. Examination of these patterns of segmentation indicates that the large mystacial vibrissae and sinus hairs on the face of the young rat are somatotopically represented three times within the trigeminal complex, as straight cylinders of neuropil, and once in the ventrobasal complex, as curved cylinders of neuropil. Neonatal vibrissae damage leads to an aberrant organization of the segmentation in the spinal trigeminal nucleus and the ventrobasal complex. In the spinal trigeminal nucleus, the SDH activity in areas associated with damaged vibrissae is of a lower than normal density, and patterns are indistinct. However, rows of clusters associated with the adjacent normal vibrissae are apparent and appear to be enlarged. In the ventrobasal complex, vibrissae damage results in bands of normal density SDH activity where rows of segmented clusters would normally be present. Comparison of these data to the cortical data in the previous paper (Killackey and Belford, '79) indicates that cortical and nuclear structures can have aspects of their development controlled by similar mechanisms.This publication has 22 references indexed in Scilit:
- The formation of afferent patterns in the somatosensory cortex of the neonatal ratJournal of Comparative Neurology, 1979
- Anomalous organization of SMI somatotopic map consequent to vibrissae removal in the newborn ratBrain Research, 1978
- Anomalous organization of thalamocortical projections consequent to vibrissae removal in the newborn rat and mouseBrain Research, 1976
- Projections of cervicothoracic dorsal roots to the cuneate nucleus of the rat, with observations on cellular ?bricks?Journal of Comparative Neurology, 1973
- The organization of mechanoreceptive projections in the ventrobasal thalamus of sheepJournal of Comparative Neurology, 1971
- Receptor field characteristics of single cells in the rat spinal trigeminal complexExperimental Neurology, 1968
- Somatic Sensory Representation in the Thalamic Ventrobasal Complex of the Spider Monkey (Ateles)Brain, Behavior and Evolution, 1968
- Somatotopic organization in the spinal trigeminal nucleus, the dorsal column nuclei and related structures in the ratJournal of Comparative Neurology, 1967
- Organization of the first and the second somesthetic regions (SI and SII) in the rat thalamusJournal of Comparative Neurology, 1965
- On the anatomical and functional organization of the spinal trigeminal nucleusJournal of Comparative Neurology, 1950