An atlas of the medulla and midbrain / Edited by H.McE.K.

  • Sabin, Florence Rena, 1871-1953.
Date:
1901
Catalogue details

Licence: In copyright

Credit: An atlas of the medulla and midbrain / Edited by H.McE.K. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    face of the imclciis. In the sections it is liard to separate these fibres from those of the ])rac'liiuni eonjunctivnin (Fig. 20). (3) Fibres of tlie braeliiuni conjunctivuni appear in some sections to enter the lateral capsnle. (4) In Plate IV of the model can be seen a small nucleus lying in the lateral capsule and in the corre- sponding sections, certain fibres appear to be definitely related to this nucleus (Fig. 21). According to Forel, the capsule receives fibres from the nucleus ruber. The description of the lateral capsule as given in Forel's article appeal's to me to a])])ly more to its dorsal portion. The longitudinal series is better than the transverse for obtaining a clear idea of the relations described above. Starting from the dorsal aspect, in Fig. Hi, is seen the area of the formatio reticularis which lies dorsal to the nucleus ruber, from this, one jDasses into the area of the definite dorsal capsule in Fig. 16. The relation of the fasciculus longi- tudinalis medialis to the nucleus of Darkschewitsch and the superior cajjsule of the nucleus ruber may be followed at the same time as far as Fig. 21. In Fig. 19 are seen, (1) the lemniscus medialis as a part of the lateral ca^Jsule; (2) the brachinm conjuuctivum just distal to the nu- cleus: (3) the relations of the N. oculomotorius; (4) Feld BATh of Forel; and (5) the fibres of the fasciculus longitudinalis medialis pass- ing into the nucleus of Darl\schewitsch (Nu. f. 1. m.). In this section it will be noted that there are a few fibres making a medial capsule. Their origin is hard to trace. In passing farther ventralward (Fig. 20), there is a great thinning out of the capsular fibres. In the first place, the lateral wall has become reduced to a few scat- tered fibres. By following carefully between the last two sections, it seems clear that some of the fibres of the lateral wall come from the pontal sheet and the brachinm conjunctivum. At the level of Fig. 21, however, its fibres appear to be directly related to a small mass of cells lying distal to the nucleus ruber and sur- rounded by the fibres of the root of the K^. oculomotorius (Xu. x. of 1. c. of Nu. 1-., Plate III). Forel's Feld II shows clearly in Fig. 21. The fasciculus retroflexus on the medial border will be de- scribed later. In passing through Figs. 22 and 23, it is evident that the fibres around tlie nucleus arc becoming fewer, while the cells become more and more numerous, especially in the pro.ximal and adjacent lateral capsules. In Fig. 24 are the cell masses that underlie both the nucleus ruber and the substantia nigra.