File:On the anatomy of vertebrates (electronic resource) (1866) (14755306685).jpg

Identifier: b20416039_002 (find matches)
Title: On the anatomy of vertebrates (electronic resource)
Year: 1866 (1860s)
Authors: Owen, Richard, 1804-1892
Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds
Publisher: London : Longmans, Green
Contributing Library: Wellcome Library
Digitizing Sponsor: Wellcome Library

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Bones of hind-foot, plantaraspect, Echidna setosa. SKELETON OF MARSUPIALIA. 329 211 The metapophyses which begin to increase in length in thethree posterior dorsal vertebras, attain a great size in the lum-bar vertebra?, and are locked into the interspace between theanapophyses and post-zygapophyses. The diapophyses of thelumbar vertebras progressively increase in length as the ver-tebras approach the sacrum ; they are most developed in theWombat, where they aredirected obliquely forward.In the Kangaroos, Potoroos,and Perameles, they arecurved forward and ob-liquely downward. Thelength of these and of themetapophyses is relativelyleast in the Petaturists,Phalangers, and Opossums. In the Wombat the meta-pophysis rises suddenly fromthe outside of the prezyga-pophysis of the twelfth dor-sal, increases in length to
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Kangaroo. the second lumbar, diminishes by degrees to the second sacral,and is rudimental in the following sacral and caudal verte-bras. A rudiment of the anapophysis is first discernible on theeleventh dorsal: the process gradually increases to the last dorsal,diminishes in the lumbar, and disappears in the last of that series.The diapophysis, moreover, is not suppressed on the last dorsalvertebra. The serial homology of the transverse processes ofthe lumbar vertebras is here manifested in the most unequivocalway; both metapophyses and anapophyses coexist with diapo-physes in the last four dorsal and the first three lumbar vertebras.Whether, therefore, the metapophysis or the anapophysis be thepart called e tubercle by some Anthropotomists, neither of themis, in the lumbar vertebras, the process named i transverse inthe thoracic vertebras: that process, to which the name diapo-physis is restricted in the present work, is continued distinctlyinto the lumbar region, and is there length

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