On the Special Structure of the Nerve Fibers Observed in Human Cerebral Pia-mater

Abstract

In the present study, the structure of the nerve fibers in human pia-mater has been examined histologically by BIELSCHOWSKY-SUZUKI's silver method which is possible to demonstrate neuroplasmic structure. The results obtained were summarized as follows.
1. The several terminal structures, such as neuroplasmic net and process, were developed from spherical or elliptical neurofibrillar swellings arranged in a thick nerve fiber as if a rosary. These findings suggest that these neurofibrillar swellings play an important role to form the terminal structure in the halfway to its end.
2. The so-called terminal corpuscules in pia-mater included such three types as the stellate neuroplasmic formation, the terminal neurofibrillar swelling and the large structure which had been considered a ganglionic cell by STÖHR. In the side of the second, the spherical neurosecretory substance was recognized.
3. Other terminal structure also presented in the conective tissues of pia-mater. This structure is of the neurofibrillar net covered with SCHWANN's sheath.
4. The nerve fiber surrounding a small venous wall by its several loops was investigated persistenly and three kind of terminal formation simply composed of neuroplasmic networks without ‘SCHWANNsches Leitplasmodium’ were recognized. These terminal formation were supplied from different sources, that is, the first directly from the spherical swellings arranged in the nerve fiber, the second from the halfway of the branch which deverged from the nerve fiber and the third from the end of the same branch respectively.
Only by these networks the nervous elements connected with the small venous wall.