北京鸭中脑脊髓通路的起源和细胞构筑：HRP逆行追踪法研究

在脊髓的颈中部、颈膨大部和腰膨大部单侧注射或包埋HRP(辣根过氧化物酶),逆行追踪了28例北京鸭,对中脑至脊髓的传导通路的起始部位、细胞构筑和机能进行了系统的研究。发现大量标记细胞分布在中脑对侧的红核,双测的Cajal中介核、中央灰质和动眼神经副交感核(即EW核)内。此外,还发现少量标记细胞分布在中脑中缝核和双侧的中脑外侧网状结构。而在顶盖内,没有任何部位出现标记细胞。研究结果表明,北京鸭除具有红核脊髓束外,还存在着Cajal中介核至脊髓的直接传导通路,EW核至脊髓的直接传导通路以及中缝核和网状结构至脊髓的直接传导通路,而不存在与哺乳类相似的顶盖脊髓束。

THE ORIGIN AND THE CYTOARCHITECTURE OF THE MIDBRAIN-SPINAL TRACTS IN WHITE PEKIN DUCKS -AN HRP STUDY

The HRP was injected or implanted into mid-cervical cord, cervical enlargement and lumbar enlargement in 28 White Pekin Ducks. The origin and the cytoarchitecture of the midbrain-spinal tracts were investigated. The brain sections of 40 um were serially cut by a freeze microtome. The BDHC reaction method was used for staining. It was found that many labeled neurons were located in the contralateral ruber nucleus, bilater al Cajal intersituated nuclei, central gray matter and EW nuclei.In additon a few of labeled neurons were distributed in raphe nucleus and bilateral reticular formations. But there was no labeled neuron in tectum. The results of this paper suggest that in White Pekin Duck, besides the rubospinal tract, there are direct spinal projections from the Cajal intersituated uncleus, EW nucleus, raphe nucleus and reticular formation. But, there is no tectospinal tract,