The American text-book of obstetrics for practitioners and students . Fir,. 222.—Diagram of pelvic brim, showing gain of space on separation of symphysis. Pubic jointclosed, pelvic cavity admits a sphere 80 mm. in diameter; joint opened 6 cm., the cavity admit- a Bphere98 mm. In diameter (after Farabeuf \. moderate expansion of the pelvis. In the simple flattened pelvis the limits of the operation may be computed from the data already considered. Thebiparietal diameter of the average fetal head is centimeters (3| inches). Itis reduced by compression during the birth to about 9 centimeters
The American text-book of obstetrics for practitioners and students . Fir,. 222.—Diagram of pelvic brim, showing gain of space on separation of symphysis. Pubic jointclosed, pelvic cavity admits a sphere 80 mm. in diameter; joint opened 6 cm., the cavity admit- a Bphere98 mm. In diameter (after Farabeuf \. moderate expansion of the pelvis. In the simple flattened pelvis the limits of the operation may be computed from the data already considered. Thebiparietal diameter of the average fetal head is centimeters (3| inches). Itis reduced by compression during the birth to about 9 centimeters (3| inches).. -1 223.—Diagram of pelvic brim, showing pain of space on separation of symphysis. Pubic join! closed, the pelvic cavity admit- a sphere GO mm. in diameter: joint opened 6 cm., the excavation admits a sphere si mm. in diameter a,,, c Farabeuf). After full separation of the symphysis the parietal bos projects into the inter-pubic space, and this in effect shortens the biparietal diameter to the extent ofnearly a centimeter more. A conjugate of 8 centimeters (3£ inches) will there-fore be required for the passage of the head. Since a pubic separation of 6centimeters (2f inches) affords a gain o( centimeters (J inch) in the antero- 438 AMERICAN TEXT-BOOK OF OBSTETRICS. posterior diameter, delivery under symphysiotomy may be done in simple flatpelves with a conjugate not below centimeters (2-| inches). Clinically,however, at least in America, 7 centimeters (2| inches) is generally adopted asthe minimum conjugate for pubic section. At its upper limit the field of symphys
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectobstetrics, bookyear1
