The thalamus of the monotremes: cyto- and myeloarchitecture and chemical neuroanatomy

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Shawn MikulaEdward G Jones

Abstract

Echidna and platypus brains were sectioned and stained by Nissl or myelin stains or immunocytochemically for calcium-binding proteins, gamma aminobutyric acid (GABA) or other antigens. Cyto- and myeloarchitecture revealed thalami that are fundamentally mammalian in organization, with the three principal divisions of the thalamus (epithalamus, dorsal thalamus and ventral thalamus) identifiable as in marsupials and eutherian mammals. The dorsal thalamus exhibits more nuclear parcellation than hitherto described, but lack of an internal medullary lamina, caused by splaying out of afferent fibre tracts that contribute to it in other mammals, makes identification of anterior, medial and intralaminar nuclear groups difficult. Differentiation of the ventral nuclei is evident with the ventral posterior nucleus of the platypus enormously expanded into the interior of the cerebral hemisphere, where it adopts a relationship to the striatum not seen in other mammals. Other nuclei such as the lateral dorsal become identifiable by expression of patterns of calcium-binding proteins identical to those found in other mammals. GABA cells are present in the ventral and dorsal thalamic nuclei, and in the ventral thalamus form a remarkable continuu...Continue Reading

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Citations

Jun 24, 2008·Journal of Chemical Neuroanatomy·Seweryn OlkowiczRouzanna L Djavadian
Jun 8, 2019·The Journal of Comparative Neurology·Patrick R Hof
May 19, 2020·The Journal of Comparative Neurology·Luis PuellesJohn L R Rubenstein

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