. The science and art of midwifery . -occipito-bregmatic. The OCCipito-mental diameter extends from the highest point ofthe occiput to the chin; J the occipitofrontal, from the occiput tothe root of the nose; the sub-occipito-breginatie, from the junction * Budin, De la Tlte du Foetus, p. 72. f The points of departure of the following diameters have been adopted fromBudins excellenl monograph, already quoted. \ The occipito-mental diameter is usually referred to as the longest one of the,head. According to Budin, the true maximum diameter is situated between thechin and a variable poinl in the
. The science and art of midwifery . -occipito-bregmatic. The OCCipito-mental diameter extends from the highest point ofthe occiput to the chin; J the occipitofrontal, from the occiput tothe root of the nose; the sub-occipito-breginatie, from the junction * Budin, De la Tlte du Foetus, p. 72. f The points of departure of the following diameters have been adopted fromBudins excellenl monograph, already quoted. \ The occipito-mental diameter is usually referred to as the longest one of the,head. According to Budin, the true maximum diameter is situated between thechin and a variable poinl in the Hue of the sagittal suture above the occiput. MECHANISM OF LABOR. !»;; of the occiput with the neck to the point of intersection in the largefontaneUe of the coronal and sagittal sutures. The transverse diameters arc: 1. The bi-parietal; 2. Th<- bi-tem-poral; 3. The bi-mastoid. The bi-parietal diameter stretches between the two bosses or pro-tuberances of the parietal bones; the bi-temporal, between the extremi- OCCIPITO MENTAL. FRONTO MENTAL. ^ OCCIPITOFRONTAL. SUB DCCIPITO BREGMATIC CERVIC0 98.—Antero-posterior and vertical diameters of the fetal head. (Tarnier et Chantreuil. ties of the coronal sutures; the bi-mastoid, between the mastoid pro-cesses at the base of the skull. The vertical diameters are : 1. The fronto-mental; 2. The cervico-bregmatic. » The fronto-mental diameter extends from the top of the foreheadto the point of the chin ; the cervico-bregmatic, from the middle ofthe large fontanelle to the upper portion of the neck near the larynx. In furnishing standard measurements of the foregoing diametersit is of course understood that no two heads present precisely the samedimensions. As a rule, as shown by Sir J. Y. Simpson, the heads ofboys are larger than those of girls. In selecting type-cases it will be re-membered too, that, owing to the plasticity of the head, in none arethe diameters completely normal immediately after the transit throu
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