縞蛇の頭部, 特に歯に分布する動脈
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概要
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Thirty snakes were prepared for this study and most speciments were infused with 10% gelatine added indian ink or vermillion. The infused cranium was fixed with 10% formalin and decalcified and then embedded in celloidin to be cut into 300 to 500 microns transparent serial sections or into 30 microns Hematoxylin-Eosin stained sections. The so-called soft tissues was taken out from the cranium in a few specimens and observed their tooth attachment. The obtained results are as follows. 1. Bones having teeth are the maxilla, mandibula, pterygoid and palatine bones and each of these bones has a long and small calibered canal, which runs parallel to the dental arch. 2. Each tooth has a dental porta on the lingual and labial surface of the dental pedicle, depending on the kind of dental arch. 3. A cavity of the dental pedicle connects with the neighbouring one through a foramina and also connects with the long canal through the short canal or fissure. 4. The maxillary, palatine and pterygoid branch of the infraorbital artery supplies the respective bone and dental arch. 5. The mandibular artery supplies the mandibular bone and its dental arch. 6. These branches can be divided into two ; one of them enters the long canal and another runs along dental arch. These two branches become two main sources of the dental arteries and therefore they should be called the first and second types, respectively. 7. The first arterial type runs along the dental arch and sends many twigs to the dental porta to supply the dental pulp, or also supplies the tooth germ. 8. The second arterial type runs in the canal and sends some twigs into the cavity of the pedicles. These twigs make a long vascular plexus with the corresponding venous roots and then this plexus sends a few branches into the dental pulp which supply small part of the pulp. This plexus passes through the wall of pedicle to connect with neighbouring plexus. 9. From view point of the tooth development, the first arterial type supplies the tooth germ and mainly supplies the attached tooth. When the tooth attached to the basal bone, the above mentioned plexus of the second arterial type sende small twigs to the small part of dental pulp.
- 1975-03-31