THE POSTNATAL DEVELOPMENT OF THE BRAIN STEM PROJECTIONS TO THE LUMBOSACRAL SPINAL CORD OF RAT——A HRP STUDY
- VernacularTitle:大白鼠脑干至腰骶髓投射的生后发育——HRP法研究
- Author:
Xiangting ZHOU
;
Zhengming NIE
;
Shanjun TANG
;
Shengqiong LIANG
;
Hua ZHANG
- Publication Type:Journal Article
- Keywords:
Brainstem-lumbosacral cord projections;
Postnatal development;
HRP method
- From:
Acta Anatomica Sinica
1953;0(01):-
- CountryChina
- Language:Chinese
-
Abstract:
The postnatal development of the efferent projections to the lumbosacral spinal cord from the brain stem of rats were studied with HRP retrograde transport method. Fifty per cent solution of HRP was slowly injected into the intumescentia lumbalis on its right side in 18 albino rats from postnatal 1-35 days. The HRP labelled cells were found in the following nuclei:1. Of the midbrain: the nucleus ruber, substantia nigra and nucleus raphe dorsalis.2. Of the pons: the nucleus reticularis pontis oralis, nucleus reticularis pontis caudalis, locus coeruleus, nucleus subcoeruleus, nucleus raphe magnus, nucleus vestibularis lateralis, and nucleus vestibularis medialis.3. Of the medulla oblongata: the nucleus raphe obscurus, nucleus raphe pallidus, nucleus reticularis ventralis, nucleus reticularis gigantocellularis, nucleus reticularis lateralis, nucleus tractus spinalis nervi trigemini, nucleus commissuralis (Cajal), nucleus prepositus hypoglossi, and nucleus gracilis.The number of the labelled cells in the above nuclei increased steadily with age. The results of present study showed that there was a postnatal developmental process in the efferent projections from the brain stem to the lumbosacral cord. The maturity of the projections from ruber nucleus and locus coeruleus were later than those of the vestibulospinal and reticulospinal tracts. The postnatal developmental process of the brain stem projections to the lumbosacral spinal cord were completed by one month after birth.
