. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. only of one leg ; in other cases, merely of the two lowerlimbs (Figs. 3840 and 3841). In the fourth type there isstill no thorax ; the trunk is more developed ; the lumbarvertebra?, the pelvis, the spinal marrow and its nerves arepresent. The lower limbs are quite complete, there is noheart (acardia). Thefflh type has the body still more de-veloped, an imperfect thorax, dorsal vertebrae, and ribs;no upper limbs, no heart, the feet are generally defective. Fig. 3S
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. only of one leg ; in other cases, merely of the two lowerlimbs (Figs. 3840 and 3841). In the fourth type there isstill no thorax ; the trunk is more developed ; the lumbarvertebra?, the pelvis, the spinal marrow and its nerves arepresent. The lower limbs are quite complete, there is noheart (acardia). Thefflh type has the body still more de-veloped, an imperfect thorax, dorsal vertebrae, and ribs;no upper limbs, no heart, the feet are generally defective. Fig. 3S3G.—Syndactylies. (Otto.) or less defective development of the brain, which in ex-treme cases is entirely wanting. In this monstrositythere is no head. The body and limbs are very defec-tive, as are also the internal organs. Previous to the end of the third week of human gesta-tion the head of the embryo is not discernible, nor yetciearly distinct from the body ; after this period, duringthe fourth week, it develops so rapidly as to be equal inbulk to the trunk. Acephalus would therefore resultfrom an arrest of development at any period before thefourth week. Tiedemann and the two Vroliks have divided the sev-eral degrees of this genus ofanomalies into nine classesor types, which will befound useful in the designa-tion and description of cases. First Type: Acephali inthe form of a rounded mass,without any indication ofextremities. (Amorphusglo-bulus, of Ourlt.) The massis covered with skin, A and generally con- /*?, tains a fold of intes- j|*;
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
