. Obstetrics: the science and the art. bottom of the cup, is the acetabulum. 42. I now represent an inside view of the right os innominatumin Fig. 13. Here the letter a is placed on the symphyseal end of theOS pubis, which, when joined to the left os coxale, makes thepubic symphysis; &is the body of the pubis running back-wards to the dotted line on the acetabulum, where it ends; c is thedescending ramus pubis, and d the ascending ramus ischii. The letter e is on thep 1 a n e of the ischium,and/on the iliac fossaor venter; g^ the anteriorsuperior spinous processof the ilium ; /i, its ante-rior
. Obstetrics: the science and the art. bottom of the cup, is the acetabulum. 42. I now represent an inside view of the right os innominatumin Fig. 13. Here the letter a is placed on the symphyseal end of theOS pubis, which, when joined to the left os coxale, makes thepubic symphysis; &is the body of the pubis running back-wards to the dotted line on the acetabulum, where it ends; c is thedescending ramus pubis, and d the ascending ramus ischii. The letter e is on thep 1 a n e of the ischium,and/on the iliac fossaor venter; g^ the anteriorsuperior spinous processof the ilium ; /i, its ante-rior inferior spinous pro-cess; while i and h re-spectively indicate theposterior superior and theposterior inferior spinousprocesses of the os the right side ofthe drawing may be seen, at ?, the ear-shaped surface denominatedthe auricular facette, which, being covered with fibro-cartilage, andunited to a similar facette on the sacrum, composes the sacro-iliac joint. The student will please to note the three dotted lines. THE PELVIS. 55 in tlie middle of tlie figure, wliich indicate tlie respective limits ofpubis, iscliium, and ilium in that direction, and he will see that one-fifth of the acetabulum belongs to the pubis ; that two-fifths of itare contributed by the ischium; while the upper and outer two-fifthsare formed by the os ilium. By examining these dotted lines, hewill learn what parts of the os innominatum belong to each of itsthree constituent members. In fact, the os innominatum, as hasbeen already seen, was originally three separate bones, which at orabout the period of puberty became consolidated by bony anchylosis,or union, into one solid os coxale, hip-bone, or side-bone. 43. If an os innominatum be taken from a subject under twelveor fourteen years of age, and macerated or boiled in water, it readilyseparates into three pieces; and the separation takes place becausethe pieces, in a tender age, are not consolidated at these dotted linesor become one fir
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectobstetrics, bookyear1
