. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . Fig. I2c.—From a reconstruction in wax. X 40 times. Cs, eighth cervicalmyotome; OV, optic vesicle; AV, auditory vesicle; H, heart; VOM,yolk vein; P, coelom; UV, umbilical vesicle; O3, third occipital myo-tome; All, allantois; Am, Fig. I2d.—View of the embryo to show the open spinal cord below andthe atrophic head with large neuropore. No. i.] ORIGIN OF HUMAN MONSTERS. 151 Sections of the chorion indicate also that it is practicallynormal with the except
. A study of the causes underlying the origin of human monsters : third contribution to the study of the pathology of human embryos . Fig. I2c.—From a reconstruction in wax. X 40 times. Cs, eighth cervicalmyotome; OV, optic vesicle; AV, auditory vesicle; H, heart; VOM,yolk vein; P, coelom; UV, umbilical vesicle; O3, third occipital myo-tome; All, allantois; Am, Fig. I2d.—View of the embryo to show the open spinal cord below andthe atrophic head with large neuropore. No. i.] ORIGIN OF HUMAN MONSTERS. 151 Sections of the chorion indicate also that it is practicallynormal with the exception of some fibrinous masses betweenthe villi. Otherwise there is no indication of a change in thestructures of the villi nor in the syncytium. It is certainly possible that all of these slight changes tookplace during the twenty-four hours before the abortion, whilethe uterus was making ready to expel the ovum. No. 13. Ovum, 8x7 mm.; vesicle within, x .85 mm. From Professor His, Leipzig. This embryo is the well-known specimen No. 44 of the Hiscollection. (See Anatomie mensch. Embryonen, II, pp. 32and 87.) The ovum is not completely covered with villi. Fig. 13a.—Section through the umbilical vesicle and chorion of specimenNo. 13, Hiss No. 44. Blood corpuscles are seen within the cavityof the vesicle. X 30 times. Within there is a small double vesicle whi
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