黒質の線維結合に関する研究

Study on the Fiber Connections in the Human Substantia nigra

I．はじめに

　人の脳を中脳で横断して大脳脚の背方を見れば，横に拡がった黒色の一帯を見ることができる。これが黒質である。人脳で黒く見えるのはメラニン顆粒をもつた中等大の神経細胞がここに集まつているためで，人以外の動物の脳でこの部分が黒くないのはメラニン顆粒をもつていないからである。

　人脳の黒質はよくみると実際に黒くみえる部分すなわち黒色部（Pars nigra）とその腹側に褐色に見える部分すなわち赤色部（Pars rubra）とにわけられる。

Although numerous contributions have been made to the knowledge of the fiber connections of substantia nigra, significant sources and ter-minations remain obscure, or in debate.

The saggital serious section of the human brain suggested this object as advantages usfor a detailed investigation of points that re-main under discussion. The Pal-Weigert method allow any appreciation of the thin myelinated components of the substantia nigra.

The results are as follows: (1) The thin myelinated components of the pars rubra of the substantia nigra can se-parate three components in transverse section.

( 2) The medial components of the substan-tia nigra run from the mamillary nucleus.

(3) The midline components of the sub-stantia nigra receive fibers from the hypothala-mus. So the substantia nigra is related to va-rious autonomic functions.

( 4 ) The lateral components of the substan-tia nigra is connecting it with the corpus st-riatum, the strionigral tract.

(5) Many fibers from the subthalamic nuc-leris (copus Luysii) terminate within substan-tia nigra and the basis pedunculi.

( 6) The author found that the substantia nigra has fiber connections between various au-tonomic functions and extrapyramidal functi-ons. The substantia nigra is the center of the extrapyramidovegetatives nerven systems.