On the development and homology of the mammalian cerebellar fissures / by O. Charnock Bradley.

  • Orlando Charnock Bradley
Date:
[1903?]
Catalogue details

Licence: In copyright

Credit: On the development and homology of the mammalian cerebellar fissures / by O. Charnock Bradley. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

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    than the other two. These facts are mentioned because of the belief that lobe D of the rabbit corresponds to two lobules in more complicated cerebella. Lobe E is entirely confined to the inferior aspect of the cerebellum, and, like lobe D, has no direct continuation into the hemisphere. The paraflocculus projects markedly from the lateral part of the hemisphere, from which it is separated by a deep fissure in front and above, and by a depression behind. It is entirely enclosed in a special fossa formed by the temporal bone (lobulus petrosus). As has been seen in tracing its development, it is really a piece of the hemisphere which has been cut off from the rest. Its developmental connection with lobe D is a point upon which it is desired to lay emphasis. The flocculus consists of two or three folia, seen best when the cerebellum is viewed from the front, and lying anterior to the paraflocculus (fig. 25). It is in contact with the lateral extremity of lobe B, from which it is separated by a fissure which contains the middle cerebellar peduncle (fig. 24). Lepus timidus (fig. 27).—The differences between the cere- bellum of the rabbit and that of the hare are not perhaps very great, but they seem sufficiently important to merit mention. Lobes A, B and C are practically identical with those of the rabbit. Lobe C has again eight folia in the vermis, and a fissure, a, deeper than the rest, separates folia 6 and 7. This fissure is much more definite in hemisphere of the hare than it is in the rabbit. The most important differences exist in lobe D. Here the number of folia is at least four, as against three in the rabbit; and the uppermost of the four is more definitely joined to the paraflocculus by a ridge which is slightly foliated along its upper border as it approaches the paraflocculus. This fact is mentioned as being the ground upon which the statement, that in the adult rabbit lobe D is connected with the paraflocculus, is based. In many specimens of the rabbit's cerebellum the adult connection is obscure; therefore the evidence afforded by the brain of the hare is welcome. Before passing to the consideration of the development of the much more com]ilicated cerebellum of the pig, it is perhaps