鸣禽鸟延脑听觉角核向中脑背外侧核的投射

The Study of Projection of Nucleus Angularis in Medulla Auditory to Nucleus Mesencephalicus Lateralis Pars Dorsalis in Songbirds

用辣根过氧化物酶（ｈｏｒｓｅｒａｄｉｓｈｐｅｒｏｘｉｄａｓｅ）注入鸣禽蜡嘴雀（Ｅｏｐｈｏｎａｍｉｇｒａｔｏｒｉａ）和锡嘴雀（Ｃｏｃｃｏｔｈｒａｕｓｔｅｓｃｏｃｃｏｔｈｒａｕｓｔｅｓ）延脑听觉角核（ＮＡ，ｎｕｃｌｅｕｓａｎｇｕｌａｒｉｓ）内顺行追踪方法，均在对侧脑桥外侧丘系（ＬＬ，Ｌｅｍｎｉｓｃｕｓｌａｔｅｒａｌｉｓ）和中脑背处侧核（ＭＬＤ，ｎｕｃｌｅｕｓｍｅｓｅｎｃｅｐｈａｌｉｃｕｓｌａｔｅｒａｌｉｓｐａｒｓｄｏｒｓａｌｉｓ）发现标记纤维。结果表明鸣禽角核可发出纤维经外侧丘系直接投入ＭＬＤ，形成脑干听觉直接通路。

The projections of nucleus angularis(NA) to nucleus mesencephalicus lateralis pars dorsalis in Eophona migratoria and Coccothraustes coccothraustes were determined by method of HRP(horseradish peroxidase) injected into NA.(LL) and MLD.The result indicates that there are the direct auditory pathway in brainstem of the songbird. NA send fibers to project to MLD via contralateral LL.