A study of the diameters of the cells and nuclei in the second cervical spinal ganglion of the adult albino rat / by Shinkishi Hatai.

  • Hatai, Shinkishi.
Date:
1907
Catalogue details

Licence: In copyright

Credit: A study of the diameters of the cells and nuclei in the second cervical spinal ganglion of the adult albino rat / by Shinkishi Hatai. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    intention later to analyse in detail all these classifications and at the present moment it is merely necessary to call attention to the fact that in the spinal ganglion several varieties of cells have been distinguished from one another. Can all these cells of different varieties be considered as belonging to a single class or are there really several types of cells composing the spinal ganglion In other Avords, a frequency of distribution of all these cells based on their sizes^ should give us more than one mode if there were more than one type of cell involved. If but one mode appears we have good ground to conclude that all these cells, though differing in size as well as in structure, may be considered from the stand- point of size, as members of a homogeneous population. The differences in structure are for the moment neglected and must form the subject of a special study. MATERIAL AND TECHNIQUE. For the present investigation the second cervical spinal ganglion of the adult albino rat was employed. The second cervical gan- glion was purposely selected since through the investigation of Ranson (’o6) we have already some numerical data in regard to this particular nerve. The second nerve with ganglion was removed from right side of a healthy male having a body-weight of 194 grams and was fixed with osmic acid. Following the usual procedure the sections of the ganglion were cut 12 micra thick and mounted in series. Three sections from the middle of the entire series of 80 sections and three s.ections from midway between the middle and end on both sides, thus making altogether nine sections, were chosen. These nine sections were selected for the measurement of the cells and nuclei on the assumption that the cells of the different sizes were uniformly distributed and consequently that the nine sections would adequately represent the total cell “population” of the ganglion. The measurements obtained from each cell and its nucleus were recorded on a separate card. In every case two maximum diameters at right angles to each other were determined for both cell-body and nucleus by means of the ocular micrometer. 1 he * Although this point could be tested also from the standpoint of the structure, nevertheless it is very difficult to obtain numerical data in terms of the structure, suitable for biometric treatment.