. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. ORGANS OF GENERATION. 19 of a quadrangular shape ; it is formed by the rounding off of the four corners of the two frontal and the two parietal bones. The posterior is triangular, and formed by the union of three bones, the superior posterior angles of the two parietal, and the upper angle of the occipital. A knowledge of these fontanelles is of great im- portance in the practice of midwifery, as they are the chief m
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. ORGANS OF GENERATION. 19 of a quadrangular shape ; it is formed by the rounding off of the four corners of the two frontal and the two parietal bones. The posterior is triangular, and formed by the union of three bones, the superior posterior angles of the two parietal, and the upper angle of the occipital. A knowledge of these fontanelles is of great im- portance in the practice of midwifery, as they are the chief means of diagnosticating the position of the child's head in labour. The great advantage gained fromi this arrangement of the child's head, is that it allows a more uniform growth and development to the brain than could have taken place had the cranium been solid, and what is perhaps of greater importance, it allows the bones to overlap, and thus permits a certain amount of compression, which enables the head to be pushed through a smaller space thaJ%,if it had been formed of one continuous piece. * The dimensions of the foetal head have been variously stated by obstetrical writers, each basing his report upon the result of his own observations. The following table, modified from Churchill's, is the best average. The longitudinal or occipito-frontal diameter, Fig 6, (' ^) is from .... The transverse or bi-parietal, from one parietal boss to the opposite, . The occipito mental, or oblique, (^ ^) The cervico-bregmatic, C ^) . The trachelo-bregmatic, . The inter-auricular, The bi malar, The fronto-mentnl, (' 8) The transverse diameter of the shoulders, hips, . In general, it may be observed that all the measurements are male than in Fig. 6. 4 in. to etal ^ in. 3i to 4 . 5 to H . 31 to 4 . 3^ to 4 3 . 3 3 to H . 4 to 5 reducible to 3 4 to 5 larger in the female children. Regions of the head.— Vertex. A circle of an inch in radius around the posterior fontanelle as a centre. Top of
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