
The number of articulations in this part of the spine of birds greatly varies; in some, there are many articu- lations, as in the dorsal and lumbar portions of the spine of the sea-gull, (represented in Plate 2, <s>Fig:<\s> letter a) whilst in others, there is not more than one moveable vertebra, and the remaining dorsal being united to each other, and the lumbar vertebrae, with the exception of this one, being anchylosed and consolidated with the sacrum; thus forming two firm and immoveable pieces as in the peacock (v. Plate 3, Fig: 1 & 2), the moveable vertebrae being situated between the two; - thus two articulations only are formed with the adja- cent lumbar and dorsal pieces, such as I have just described. In the former, the motion of the spine is much more divided, and the semilunar articulating cavities in the bodies of the vertebrae are not so deep, nor are the connecting surfaces of the joints of the articulating processes so extensive, though the formation of both these articulations, with these exceptions, are the same. <s>, and pass obliquely from one vertebra to the next, mutually locking them together; and in order to most effectually to preclude the possibility of any flection, the spinous processes, and sometimes even the bodies of the dorsal vertebrae, are immoveably soldered together <\s> Although
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Manuscript details
- Author
- George Oakley Fleming
- Reference
- AP/28/6
- Series
- AP
- Date
- 1846
- IIIF
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Cite as
On Motion in the lumbar division of the spine of birds, by George Oakley Fleming , 1846. From The Royal Society, AP/28/6
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