The practice of obstetrics, designed for the use of students and practitioners of medicine . aped like a stretched-out quadrangle, constricted and twistedin the middle, by which means the two parts of the bone are brought into differ-ent planes (Fig. 506). The hip-bone is composed of: (i) the ilium; (2) the 375 376 PHYSIOLOGICAL LABOR. ischium; (3) the pubis. It is not till the eighteenth or twentieth year thatthe several parts of the acetabulum are firmly joined. A faint white line marksthe junctions. The sacrum forms the larger part of the posterior pelvic is shaped like a pyramid wi
The practice of obstetrics, designed for the use of students and practitioners of medicine . aped like a stretched-out quadrangle, constricted and twistedin the middle, by which means the two parts of the bone are brought into differ-ent planes (Fig. 506). The hip-bone is composed of: (i) the ilium; (2) the 375 376 PHYSIOLOGICAL LABOR. ischium; (3) the pubis. It is not till the eighteenth or twentieth year thatthe several parts of the acetabulum are firmly joined. A faint white line marksthe junctions. The sacrum forms the larger part of the posterior pelvic is shaped like a pyramid with the base at the upper part, and is composedof four vertebras. The term is derived from sacer, sacred, because it helpsprotect the genitals, which were held to be sacred, or because it was offeredin sacrifice. The coccyx—so named because it was thought to look like thecuckoos beak—comprises five rudimentary vertebrae. It is shaped like atriangle and has its base pointing upward. If a bony union is establishedbetween the sacrum and coccyx, it may offer an obstacle to labor; normally. Fig. 506.—Female Bony Pelvis. the coccyx remains movable until middle life. It represents the tail appendagein vertebrates. The Pelvic Joints.—By their existence the pelvis is possessed of a certainamount of mobility between its several parts. These articulations numberseven—one pubic, two sacro-iliac, three sacro-lumbar, and one of these articulations are amphiarthrodial, much like those between thebodies of the vertebra. Pubic Joint or Symphysis Pubis.—The pubic joint or symphysis pos-sesses fibro-cartilages similar to the intervertebral discs, each of which is firmlyattached to the corresponding pubic bone. This cartilage is soft in the centerand firmer at the outside; thicker in front than behind, and thicker in femalesthan in males. Many assert the presence of a synovial membrane,* thoughMorris, Depaul, and French authorities generally deny its existence save
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectobstetrics, bookyear1
