. An American text-book of obstetrics. For practitioners and students. Fig. 245.—Constriction-ring about the neck of the child(one-sixth natural size). Fig. 246.—Diagram of head lever. vertebral column to the skull at a point much nearer to the occipital than tothe frontal end of the head ; second, the mechanical effects of the irregularshape of the skull. Unequal Lengths of the Ends of the Head.—The effects of the excentricposition of the occipito-atlautoid articulation must be investigated separatelyfor each of the three forms of force that may be active—that is, for the forceof gravity, the
. An American text-book of obstetrics. For practitioners and students. Fig. 245.—Constriction-ring about the neck of the child(one-sixth natural size). Fig. 246.—Diagram of head lever. vertebral column to the skull at a point much nearer to the occipital than tothe frontal end of the head ; second, the mechanical effects of the irregularshape of the skull. Unequal Lengths of the Ends of the Head.—The effects of the excentricposition of the occipito-atlautoid articulation must be investigated separatelyfor each of the three forms of force that may be active—that is, for the forceof gravity, the general fluid-pressure, and the force of direct contact with theuterine muscle. Force of Gravity.—Whenever the force of gravity is active, it is evi-dent that the weight of the body will be transmitted to the skull throughthe occipito-atlautoid articulation. If the fetal head is supposed, at the begin-ning of this motion, to occupy a position midway between extension andflexion, the occipital and sincipital ends of the head, marked O and F respect-ively (
Size: 1153px × 2167px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectobstetrics, bookyear1
