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The thalamus and its cortical projection in the brush tailed possum, Trichosurus vulpecula, and the native cat Dasyurus viverrinus, with a comparative review of thalamic organisation in marsupial and placental mammals

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Neylon, Lee 1983 , 'The thalamus and its cortical projection in the brush tailed possum, Trichosurus vulpecula, and the native cat Dasyurus viverrinus, with a comparative review of thalamic organisation in marsupial and placental mammals', PhD thesis, University of Tasmania.

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[img] PDF (Whole thesis)
whole_NeylonLee...pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

This thesis is presented in two parts:
The first comprises a review of thalamic structure and
connections in marsupial mammals, and comparison with
placental species.
The major groups of thalamic nuclei are treated in
turn. The cytoarchitecture of each group is described
and compared in different marsupials, with greatest
emphasis being placed on the Virginia opossum Didelphis
virginiana, the brush-tailed possum Trichosurus
vulpecula, and the native cat Dasyurus viverrinus. The
presently available information on afferent and
efferent connections of specific regions in marsupials
and placentals is then reviewed,and comparisons made
within and between the two mammalian groups. Possible
functional roles of each region are also briefly
discussed.
Among marsupials many fundamental similarities in
thalamic organisation are evident, but also several
important differences. Most of these differences can
be seen to be related to particular groupings of
animals, or to follow trends across the range of
species examined. Representative Australian diprotodonts,
such as Trichosurus, and to extent polyprotodonts, such as Dasyurus,
number of features which distinguish them American didelphids,
such as the opossum a lesser exhibit a from the Didelphis.
Most of these variations in thalamic organisation show
clear parallels to the morphological and serological
distinctions between the three marsupial groups. Some
of the distinguishing characteristics of Australian
forms represent considerable progress from the
relatively primitive level of development found in the
didelphids, and convergence upon the more highly
evolved organisational plans of advanced placental
mammals.
Comparisons of the connective relationship of specific
thalamic regions in marsupials and placentals reveal
many features which are shared by most or all species.
There are occasional significant departures from what
apparently constitute general mammalian plans, however
most cases where important interspecies variations
occur concern details in the distribution patterns of
particular input and/or output connections.
The most marked differences in connection patterns
among both marsupials and placentals are found with the
rostral ventral tier nuclei (ventroanterior
ventrolateral complexes and ventromedial nucleus or
possible equivalent) and the central intralaminar group.
Most other thalamic centres appear to have
rather more uniform organisation.
The second part of the thesis comprises published
details of examinations of thalamic and cortical
structure and connections in the brush-tailed possum
Trichosurus vulpecula, and the native cat Dasyurus
viverrinus, with short notes on somatosensory cortical
organisation in the rufous wallaby Thylogale
billardierii.

Item Type: Thesis - PhD
Authors/Creators:Neylon, Lee
Keywords: Thalamus, Cerebral cortex, Brush-tailed possums, Dasyuridae
Copyright Holders: The Author
Copyright Information:

Copyright 1984 the author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D)--University of Tasmania, 1984. Bibliography: leaves 239-283. Contents: Part 1. Review of the thalamic structure and connections in marsupials and comparison with placental species.--Part 2. Published details of studies of thalamic and cortical organisation in Australian marsupials

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