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About the partition of cranium. The cranium being rather a complex aggregate of several interdependent entities, its partonomic description is not straigtforward. This note justify the approach taken by TAH.At first thought, the cranium can be divided into neurocranium and viscerocranium, the former being itself divided into calvaria and basicranium. However, this common view is approximative and will not resist to precise examination. Just as an example of this difficulty, the sphenoid bone is present in the orbit being a part of the viscerocranium, in the tempus being a part of calvaria and in the basicranium. (more arguments here).In order to avoid this problem, TAH keeps viscerocranium, calvaria and basicranium at the same partonomic level as direct children of cranium. The orbita, as well as the bony nasal cavity, are also kept at this level and not as a child of viscerocranium.
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