![]() The distal part of CA1 has been shown to play a role in object integration into the spatial map. The elongation was not present in brains of primates, marsupials, or monotremes. ![]() A modest elongation of CA1 is also present in some other placental mammals, notably the elephant shrew, hyrax, capybara, beaver, and rabbit. A similar but less pronounced CA1 elongation was seen in the brains of 14 carnivores. In a perissodactyl ungulate (Burchell's zebra) the distal end of CA1 is so large that it forms a number of folds. In individual coronal sections of the brains of seven artiodactyl ungulates, the pyramidal layer of CA1 is four times as long as CA2 + CA3. This phenomenon has not previously been reported. We found wide variation in the form of the hippocampal formation, the most extreme examples of which are seen in ungulates, which possess an unusual elongation of the distal CA1 of the septal hippocampus. We have tested this assumption by examining sections of brains of 56 mammals from 20 mammalian orders from images on the website. It is widely assumed that the hippocampal formation seen in laboratory rodents and in primates is typical of that seen in other mammals.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |