. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TERATOLOGY. 965 peculiar and sarcastic wit to this absurd etiology, and gives the very ludicrous ac- count of a surgeon -who supposed that the Sireniform monster had been formed during a very difficult delivery. If it is, on the contrary, an original malformation, it may be asked, what can be its remote cause ? Is it the original want of one of the umbilical ar- teries ? I should not think so ; for one of these arteries is also wanting in the variety in which all the parts of the two extremities are present, and we know
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. TERATOLOGY. 965 peculiar and sarcastic wit to this absurd etiology, and gives the very ludicrous ac- count of a surgeon -who supposed that the Sireniform monster had been formed during a very difficult delivery. If it is, on the contrary, an original malformation, it may be asked, what can be its remote cause ? Is it the original want of one of the umbilical ar- teries ? I should not think so ; for one of these arteries is also wanting in the variety in which all the parts of the two extremities are present, and we know that one of them may be wanting in a completely well-formed child. (See p. 9^8.) Another question is, whether sympodia can be attributed to the coalescence of the inferior extremities (Meckel, Kamm, Boerhave, and Cruveilhier). Neither am I in- clined to adopt this cause. 1. I cannot imagine a coalesence of bones so complete, that through these could be formed one single extremity. 2. It is impossible to explain by it the im- perfect condition of the leg and of the foot in the majority of cases. 3. From such a fusion or coalescence can- not be derived the imperfect state of the rectum, and of the sexual and uropoietic or- gans. It seems to me more probable that sym- podia is due to some original malformation of the pelvis and its viscera, of which the cause remains unknown. The formation of a head solely, of an incomplete trunk without the lower limbs, or of a single inferior ex- tremity, is certainly to be attributed to nothing else but impeded developement. It shows, moreover, that the different parts of the body are quite independent of each other in their original formation. e. Original defective formation of the pelvis. In a well constituted body the pelvis may be originally malformed, as is proved by the ob- Kquely narrow pelvis of Nazele, and by the transversely narrow pelvis of Robert; of which malformation the cause is to be found in the imperfect formation of the sacr
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