ObstetricsA manual for students and practitioners . Showing Fontanelles and Su-tures at Crown of Head;A,Ii, biparietal diameter. 1. The longitudinal diameters are-FiG. 10. occipito-mental, inches, fromthe occipital protuberance tothe chin; occipito-frontal, , from the occipital pro-tuberance to the root of nose;suboccipito - bregmatic, , from midway betweenthe occipital protuberance andforamen magnum to the centreof the anterior fontanelle. 2. The vertical diameters are—the mento-bregmatic, , from the chin to thecentre of the anterior fonta-nelle ; the trachelo-b
ObstetricsA manual for students and practitioners . Showing Fontanelles and Su-tures at Crown of Head;A,Ii, biparietal diameter. 1. The longitudinal diameters are-FiG. 10. occipito-mental, inches, fromthe occipital protuberance tothe chin; occipito-frontal, , from the occipital pro-tuberance to the root of nose;suboccipito - bregmatic, , from midway betweenthe occipital protuberance andforamen magnum to the centreof the anterior fontanelle. 2. The vertical diameters are—the mento-bregmatic, , from the chin to thecentre of the anterior fonta-nelle ; the trachelo-bregmatic, inches, from the bregmato the anterior part of the for-amen magnum. 3. The transverse diametersare—the biparietal, inches,from one parietal tuberosity to the other; the bitemporal, inches, from the root of one zygomato the corresponding point on the opposite side; the bimastoid, 3 inches,from one mastoid process to the other. (These figures are taken fromCharpentier, vol. i. pp. 232, 233.) 3— 1-2, occipito-frontal; 3-4, occipito-mental; 5-6,trachelo-bregmatic; 7-8, frouto-mental. 34 PREGNANCY. NUTRITION OF THE FCE3TUS. How does the child receive its nutrition in utero ? Before the formation of the allantois and umbilical vesicle the ovumderives its nourishment from the cells that form the discus proligerus;then by the albuminous material covering it. After reaching the uterusthe allantois and umbilical vesicle supply it with nourishment until theplacenta is formed. As soon as the placenta is formed the foetal nutrition is fully estab-lished, as it acts as an organ of absorption by which nutritious materialis carried from the blood of the mother to the foetus. This is provenby the fact that when the placental circulation is interfered with to anygreat extent the foetus dies. How is respiration carried on in utero ? Before the placenta is formed it is possible that there is no respi-ration, and if there is, the mode in which it is carried on is unk
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
