Contribution on the size and morphology of Subarcuate fossa in some mammals and its implications to phylogeny
The size of subarcuate fossa of six different mammals has been observed. Among the examined species; camel, dog, rabbit and rat show clear subarcuate structure, which was characterized by the shape of fossa, and could be easily measured by using endocast. In these species the parafloccular lobe o...
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| Formato: | article |
| Lenguaje: | EN |
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South Valley University
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/c6327fcba5284ff38b45dfde7eee1281 |
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| Sumario: | The size of subarcuate fossa of six different mammals has been observed. Among the
examined species; camel, dog, rabbit and rat show clear subarcuate structure, which was characterized
by the shape of fossa, and could be easily measured by using endocast. In these species the
parafloccular lobe of cerebellum is isolated from cranial cavity and engulfed by this fossa. However,
in donkey, the fossa is unclear or absent. Studies have reported correlated relationship between the
subarcuate fossa and the size of skull and certain parts of the cerebellum. The size of the subarcuate
fossa is varying from absence of the fossa to large size fossa with its high contribution area of skull
size. Dog has the largest subarcuate fossa among the examined species in this study followed by
rabbit then camel, after that rat, very small in ruminants and nearly absent in equine. The study reveals
the possibility of subarcuate fossa to determine the degree of evolution of the animals, based on
variation of this fossa in closely related animals. This order does not follow any previous study in
literatures that hypothesis correlation between the size of subarcuate fossa and the size of skull or
animal size or even part of cerebellum which evolved in this fossa. The result of this paper supports
the hypothesis of the correlation relationship between subarcuate fossa and phylogeny of the animals. |
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