. Questions and answers on the essentials of obstetrics; Prepared especially for students of medicine. The brain and cranial vault areabsent. These monsters are practically pseudencephalic foetusesminus the vascular tumor. a. Derencephalus. The brain and cranial vault are absent andthe occipital foramen is lacking. There is also an arrestin development of the cervical vertebras and also, occa-sionally, of the upper dorsal. LABOR. 161 b. Anencephalus. There is an arrest in development of theentire vertebral column, which is open and forms a spinal cord is absent. This variety of mons
. Questions and answers on the essentials of obstetrics; Prepared especially for students of medicine. The brain and cranial vault areabsent. These monsters are practically pseudencephalic foetusesminus the vascular tumor. a. Derencephalus. The brain and cranial vault are absent andthe occipital foramen is lacking. There is also an arrestin development of the cervical vertebras and also, occa-sionally, of the upper dorsal. LABOR. 161 b. Anencephalus. There is an arrest in development of theentire vertebral column, which is open and forms a spinal cord is absent. This variety of monster ispractically an exaggerated example of a Cyclocephalic Monsters,âWhere there is an absence, ormore or less atrophy, of the nasal apparatus; the eyes are rudi-mentary and approach the median line, occasionally they are fusedinto one. a. Ethnocephalus. The nose is not entirely absent. There are two incompletely formed nostrils, or only one. There aretwo eyes. b. Cebocephalus. The nose is entirely absent. In this, as in the preceding variety, there are two eyes. Fig. Ehinocephalus. c. Rhinocephalus. The nose resembles a tube or trunk, andthe eyes, which are usually fused into one, occupy themedian line, and are situated below. The nose, as a rule,has only one opening. 11 162 ESSENTIALS OF OBSTETRICS. d. Cydocephalus. Complete atrophy of the nose, with a singleeye situated in the median AcEPHALic Monsters.âWhere there is a complete absenceof the head. Name and describe the double monsters. 1. Ensomphalic Monsters.â These foetuses are each prac-tically complete although united together, and are able to accom-plish independently almost all vital functions. Each has its ownumbilicus, and, during intra-uterine life, its umbilical cord.(Saint-Hilaire.) a. Pygopagus. Where the buttocks, or backs are united. These monsters are viable. b. Metopagus. They are united by their heads, forehead to forehead, vertex to vertex. c. Cephalopagus. The twins
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