โ Scribed by L. S. Ross
No coin nor oath required. For personal study only.
ELEVEN F I G U R E S -4ttempts to solve recognized cytological problems axe continuously bringing new problems to the attention of the investigator. Improved instruments and new technique serve t,o bring to view unsuspected elements of structure in the constitution of the cell. The multiplication of physiological problems keeps pace with the increase of the morphological.
In cells of different tissues from various animals, both chordate and non-chordate, a more or less complex framework (extends froni without into the cell body. This is known as the trophospongium of Holmgren, or simply the trophospongium. Coghill in his review ('04) stat,es that the first observation of such a structure in the nerve cell was recorded by Fritsch in 1886 in a study upon the medulla oblongata of Lophius; that Holmgren in 1899, in a report upon an investigation of the spinal ganglion cell of Lophius was probably the first to confirm this observation of Fritsch and that in the same year, 1899, Nelis described structures that evidently are the same as those observed by Fritsch and Holnigreii. Since that date numbers of investigators have studied the trophospongium in its morphological and physiological aspects.
The descriptions of the trophospongium as given by some authors seem to indicate that the structure is composed of a reticulation of delicate fibers. On the other hand the description as given by Antoni refers to the capsular buds ('kapsulare Sprossungen') from the intercellular tissue, that separate the protoplasm of the nerve cell into unequal lobes. These processes 523
๐ SIMILAR VOLUMES
I A grant from the Aineriean Aeadeiiiy of Arts and Sciences was in large part responsible f o r this work.