. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 20,3 Whether these pelves and those mentioned by Rokitansky are not similar to those de- scribed by Naegele as arrest of development of one side of the first sacral bone, is a question which can only be decided by ab- solute comparison of the specimens. A greater or more advanced development of one side of the pelvis than the other is said by Knox, in a memoir " On the Statistics of Hernia," to be frequently seen, and to pro- duce a greater predisposition to hernia on that side. The author considers it
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PELVIS. 20,3 Whether these pelves and those mentioned by Rokitansky are not similar to those de- scribed by Naegele as arrest of development of one side of the first sacral bone, is a question which can only be decided by ab- solute comparison of the specimens. A greater or more advanced development of one side of the pelvis than the other is said by Knox, in a memoir " On the Statistics of Hernia," to be frequently seen, and to pro- duce a greater predisposition to hernia on that side. The author considers it as the result of a similar want of balance between the development of the lateral halves of the pelvis to that seen, in a greater degree, in the "pelvis oblique ovata" and which is also often seen between that of the true and false pelvis. Pelvis obstructed by exostosis.— Exostoses projecting from the pelvic bones most usually proceed from their internal surfaces, in \\hich position they are also of more serious im- portance in producing obstruction to parturi- tion in the female. According to Bamsbotham, it is a rare condition of the pelvis, he having never seen an instance. Exostoses are most frequently found at the back part of the pelvic cavity, growing from the sacrum, near the sacro-iliac joint, or, according to Lever, at the last sacral piece. They are, however, by no means confined to these positions. Many instances of this disease have been recorded, in which the diagnosis has not been verified by post-mortem examination ; and it is doubtful whether many of them were not projections of the sacral promontory and lumbar vertebrae, as in a case described by Nagelin the Frankfurter Zeitung (April, 1778). It has been observed in the male as well as in the female pelvis. One of the most remarkable cases of cx- ostosis of the sacrum, producing obstruction to parturition, occurred to Dr. Haber, and is recorded in Naegele's Inaugural Disser- tation, published at He
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