大白鼠皮质躯体感觉区在丘脑腹后核组的定位——HRP法研究

本文用HRP法研究了20只大白鼠躯体感觉皮质区在丘脑腹后核组内的定位。鼠躯体感觉皮质区的前部接受丘脑腹后核组腹外侧部的投射;后部接受腹后核组背侧部的投射;腹后核组吻侧段外侧部的纤维投射到躯体感觉皮质区的内侧部(上部);腹后核组尾侧段内侧部的纤维投射到躯体感觉皮质区的外侧部(下部)。丘脑腹后核组内所有标记细胞均出现在注射同侧,提示丘脑皮质投射是不交叉的。丘脑腹后核组投射到Brodmann 3区的神经元多,投射到2区的神经元少。本文还探讨了标记神经元数量与投射纤维多少的关系。

TOPOGRAPHIC PRCJECTIONS OF VENTROPOSTERIOR THALAMIC COMPLEX TO THE SOMATIC SENSORY CORTICAL AREAS IN RATS

The projection from the ventral posterior nucleus (VP) of the thalamus to the somatic sensory cortical area (SmI) in the rat was studied with the horseradish peroxidase (HRP) method. When injections were made into the anterior part of SmI (Brodmann 3), labeled cells were found in the ventral area of caudal VP. When injections were made into the posterior part of SmI (Brodmann 3,1), Iabeled cells were observed in the dorsal area of caudal VP. With injections located near the superior part of SmI (Brodmann 3), labeled cells were found in the lateral area of VP. When injections were made into the inferior part of SmI (Brodmann 2), labeled cells were seen in the medial area of VP. All labeled cells were observed in the injected side, indicating that the projection is uncrossed. Neurons in VP Projecting to Brodmann 2 is less than those projecting to Brodmann 3. Relationship between the quantity of labeled neurons and the amount of projection fibers was discussed.