. The science and art of midwifery . e reduction of its volume are re-sorted to in view of its probable early demise. An acardiacus is a monster devoid of the heart. It is developedsimultaneously with a normal foetus, and is usually born after the lat-ter. Its development, as already explained,! occurs in the followingmanner: The balance of circulation in the anastomosing vascular sys-tems of twins contained in a single chorion (and therefore of the samesex) becomes disturbed, and the pressure in one system bo preponder- * Spiegelbeeg, Lehrbnch, p. 531. f Chapter on Multiple Pregnancy. 558 THE
. The science and art of midwifery . e reduction of its volume are re-sorted to in view of its probable early demise. An acardiacus is a monster devoid of the heart. It is developedsimultaneously with a normal foetus, and is usually born after the lat-ter. Its development, as already explained,! occurs in the followingmanner: The balance of circulation in the anastomosing vascular sys-tems of twins contained in a single chorion (and therefore of the samesex) becomes disturbed, and the pressure in one system bo preponder- * Spiegelbeeg, Lehrbnch, p. 531. f Chapter on Multiple Pregnancy. 558 THE PATHOLOGY OF LABOR. atea over that in the other that the circulation of the latter is reversed and its hearts, lungs, and body atrophy. It now receives its nutritivesupplies from the normal fcetus. As the result of congestion in itsumbilical vein, its connective tissue of ten undergoes hypertrophy andedematous infiltration. The same cause may result in* hydrocephalus or m the development of a monster presently to be described as an. Fig. 880.—Authors case of acardla. anencephalus. The most common variety of aeardiaoua is known asthe acephalus, or headless monster. The amorphus is an acardiaous Without head or extremities. It is of rounded form, and its surfacethough ordinarily smooth, may present faintly marked tubercles, whichare regarded as rudimentary extremities. The interior of the amor-phua contains a rudimentary intestinal canal, cystic cavities, muscles,and vertebrae. The umbilical cord is attached indifferently to any ABNORMALITIES OF THE FOETUS. 550 part of the body. The rarest form of the acardiacns is the acormus, or trunkless monster. It consists of an imperfectly developed headwith a rudimentary trunk. Its umbilical cord is attached to the cer-vical region. An anencephalus or hemicephalus is a monster with a well-devel-oped trunk and a rudimentary head. The neck is short and the headrests directly upon the shoulders, which are so unusually broad as toconstitute
Size: 1391px × 1796px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdec, booksubjectobstetrics, booksubjectwomen
