On the middle meningeal artery of the dog, referred to its origin and the r. anastomoticus.

The middle meningeal artery of the dog usually diverges from the maxillary artery before it enters into the alar canal. This vessel shows an extremely complicated relationship between the passage into the cranial cavity and the r. anastomoticus as well as the anastomotic artery. In some carnivora, branches of the maxillary artery in this region communicate with the internal carotid artery. Especially in the dog, the arterial branches which contribute to this communication are the r. anastomoticus of the middle meningeal artery and the anastomotic artery of the external ophthalmic artery. The present study will deal with the relationship between the middle meningeal artery and the r. anastomoticus.