「ウナギ」の頭部, とくに歯の動脈分布について
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概要
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Using a total of 30 samples of eel, Anguilla japonica, mode of blood supply in the head was studied, and detailed observations were made on the blood supply in the upper and lower jaw teeth, vomerine teeth and their surrounding tissues. Besides using conventional technics, the scanning electron microscope was used to observe the actual shape of individual teeth, their mode of standing and to know the three dimensional relationship between the blood supply and the teeth. Results were summarized as follows. 1. The main artery supplying the region is A. carotis communis that derives from A. branchalis efferentes I. This artery branches into A. carotis externa and A. carotis interna, and the latter branches into A. cerebri and A. ophthalmonasalis. The latter artery further branches into A. ophthalmica and A. maxillaris and finally turns into A. nasalis. A. carotis externa, on the other hand, makes a turn in the orbit and sends out A. facialis mandibularis, then, after further sending out R. dentalis superior posterior becomes to be A. mandibularis. A. mandibularis sends out two branches, A. dentalis inferior anterior that runs along the inside wall of the mandible, and A. dentalis inferior posterior that runs within the mandibular canal. 2. The vomerine teeth group is supplied by the arterial branches sent out from ventral side of A. nasalis and distributing there from outside. The maxillary teeth group is supplied by A. dentalis superior anterior steming from A. maxillaris and by A. dentalis superior posterior steming from A. nasalis. Besides, these teeth group is distributed by R. dentalis superior posterior coming from A. mandibularis. The mandibular teeth group is supplied by A. dentalis inferior anterior and A. dentalis inferior posterior, both stemed from A. mandibularis. 3. Observations on the mode of arterial distribution in the teeth and their surrounding tissues revealed that there are two kinds of distribution whereby some branches go directly to the periodontal tissues and others once enter into the bone and then proceed to the pulp of individual teeth for distribution. It was particularly noticed with the latter branches of artery that they are ramified at the intervals of every 5 to 6 teeth, and, on reaching near the dental pedicles, a part of the branches is distributed to the dental pulp and the rest enters into small pits between the bone and the pedicles to be distributed to the successive teeth and the surrounding tissues.
- 九州歯科学会の論文
- 1973-03-31