Structure of the cerebral cortex of the humpback whale, Megaptera novaeangliae (Cetacea, Mysticeti, Balaenopteridae)

@article{Hof2007StructureOT,
  title={Structure of the cerebral cortex of the humpback whale, Megaptera novaeangliae (Cetacea, Mysticeti, Balaenopteridae)},
  author={Patrick R. Hof and Estel Van der Gucht},
  journal={The Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology},
  year={2007},
  volume={290}
}
  • P. Hof, E. Van der Gucht
  • Published 1 January 2007
  • Biology
  • The Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
Cetaceans diverged from terrestrial mammals between 50 and 60 million years ago and acquired, during their adaptation to a fully aquatic milieu, many derived features, including echolocation (in odontocetes), remarkable auditory and communicative abilities, as well as a complex social organization. [] Key Method We studied the cerebral cortex of the humpback whale (Megaptera novaeangliae) in comparison to another balaenopterid, the fin whale, and representative odontocetes. We observed several differences…
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References

SHOWING 1-10 OF 159 REFERENCES
Origin and evolution of large brains in toothed whales.
  • L. Marino, D. McShea, M. Uhen
  • Biology, Environmental Science
    The anatomical record. Part A, Discoveries in molecular, cellular, and evolutionary biology
  • 2004
TLDR
It is shown that brain size increased significantly in two critical phases in the evolution of odontocetes, and was accompanied by a decrease in body size in Delphinoidea only by 15 million years ago.
SURFACE MORPHOLOGY OF THE FOREBRAIN OF THE BOWHEAD WHALE, BALAENA MYSTICETUS
TLDR
The bowhead brain is similar to other cetacean brains, particularly that of the southern right whale; long olfactory peduncles are reflected upon the rostrodorsal surface of the cerebral hemispheres; and pineal-body-like tissue was present in one specimen.
Cortical complexity in cetacean brains.
  • P. Hof, R. Chanis, L. Marino
  • Biology, Psychology
    The anatomical record. Part A, Discoveries in molecular, cellular, and evolutionary biology
  • 2005
TLDR
Data on brain size and hemisphere surface configuration in several cetacean species are summarized and an overview of the cytoarchitectural complexity of the cerebral cortex of the bottlenose dolphin is presented.
The limbic lobe of the dolphin brain: a quantitative cytoarchitectonic study.
In these cytoarchitectonic studies of the cortical limbic formations of the bottlenose dolphin and other whale brains we have carried out quantitative analyses of the entire limbic lobe, including
Structure and nerve cell organisation in the cerebral cortex of the dolphin Stenella coeruleoalba a Golgi study. With special attention to the primary auditory area.
TLDR
Although the basic structure of the cerebral cortex is thus similar to that observed in insectivores and chiropterids, dolphins have dramatically increased numbers of cerebral convolutions exceeding those found in most advanced terrestrial mammals.
Motor Field in Cerebral Cortex of the Bottlenose Dolphin
T HE largest animals that have ever lived belong to the order Cetacea. Man in general and biologists in particular have been intrigued by the size of these mammals and by their adaptation to a
Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls
TLDR
Cladistic analysis of the skeletons of two early Eocene pakicetid cetaceans, the fox-sized Ichthyolestes pinfoldi, and the wolf-sized Pakicetus attocki, indicates that cetACEans are more closely related to artiodactyls than to any mesonychian, and supports monophyly of artiodACTyls.
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