Abstract
1. As the results of our study on the brain stems of a pigeon, a japanese bush warbler, a baby crow, a gull, an owl and a cock, we have found that their abducens nuclei were situated entirely dorsally, in a position not much different from those in mammalia.
2. With the exception of an owl, the abducens nucleus is located more caudally than the facial nucleus.
3. The abducens root is also found in a more caudal position than the facial root, with the same exception of the owl.
