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破坏8只大白鼠的一侧下丘,用Nauta方法染色,追踪下丘传出纤维的投射地点,得到下列结果。同侧投射:下丘最大量纤维是通过下丘臂上行,小部分终止于中脑被盖外侧网状核,大部分终止于内侧膝状体。下丘少量纤维通过顶盖脑桥束下行终止于外侧桥核。下丘极少量纤维终止于中脑中央灰质及上丘深层。对侧投射:下丘向对侧投射的纤维,除逆行纤维外,都通过下丘连合走向对侧,其中大量纤维终止于对侧下丘背侧部,少量纤维走向下丘臂终止于中脑被盖外侧部网状核。逆行纤维的投射:下丘发出少量逆行纤维,沿外侧丘系逆行而下,至上橄榄核簇平面分成二股:一股穿锥体束行向对侧,终止于对侧斜方体腹侧核、蜗背核及蜗腹核;另一股转弯终止于同侧斜方体腹侧核、蜗背核及蜗腹核。基于以上情况,可知下丘传出纤维绝大部分是终止于同侧内侧膝状体及对侧下丘,通过后者,又可与对侧内侧膝状体取得间接联系。作者推测下丘在听觉传导系统中的功能地位,似乎为一感觉中枢,它对低级反射的作用很小。
Destroy 8 rats on one side of the inferior colliculus, stained with Nauta method and track the projection site of the inferior fibers. The following results were obtained. Ipsilateral projection: the largest amount of the inferior colliculus fibers through the inferior colliculus up, a small part of the termination of the medial capillaris lateral reticular nucleus, most of the termination in the medial geniculate body. A small amount of the inferior colliculus ends in the lateral axons through the capsular pontine bundle. A very small amount of the inferior colliculus terminates in the central gray matter of the midbrain and deep in the superior colliculus. Contralateral projection: the inferior collicular projection to the opposite side of the fiber, in addition to retrograde fiber, all through the inferior colliculus to the contralateral side, in which a large number of fibers terminate in the contralateral dorsal hypothalami, a small amount of fiber to the inferior quadrant was terminated in the mesencephalic Cover the lateral reticular nuclei. Retrograde fiber projection: the inferior colliculus issued a small amount of retrograde fibers retrograde downward along the lateral mound system, the upper olive kernel cluster plane is divided into two: one to wear the pyramidal tract line to the contralateral, terminating in the contralateral rhomboid ventral nucleus, The dorsal and cochlear nucleus; the other turns to terminate in the ipsilateral orthotopic rostral ventral nucleus, the dorsal raphe nucleus and the dilated nucleus. Based on the above, we can see that the vast majority of the inferior colliculus fibers terminate in the medial geniculate and the contralateral inferior colliculus, through the latter, but also with the contralateral medial geniculate indirectly. The authors hypothesize that the function of the inferior colliculus in the auditory conduction system appears to be a central sensory center, with little effect on low-level reflexes.