. Manual of antenatal pathology and hygiene : the foetus. §.Ju Femoral?^ head. THE PELVIS 117 The sacrum is quite straight, or has only a slight anterior con-cavity in the foetus. Its wings are little developed, so that the lengthof the bone is greater than its breadth, dolichohieric, and the sacralindex 76°; but, while this is the generally accepted statement, A.Thomson {loc. cit., p. 372) has asserted that it is platyhieric with anindex of 100°. The iliac bones have an almost inappreciable anteriorconcavity, and their angle of divarication is large. The pubic bonesare stumpy, and the symphys
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. Manual of antenatal pathology and hygiene : the foetus. §.Ju Femoral?^ head. THE PELVIS 117 The sacrum is quite straight, or has only a slight anterior con-cavity in the foetus. Its wings are little developed, so that the lengthof the bone is greater than its breadth, dolichohieric, and the sacralindex 76°; but, while this is the generally accepted statement, A.Thomson {loc. cit., p. 372) has asserted that it is platyhieric with anindex of 100°. The iliac bones have an almost inappreciable anteriorconcavity, and their angle of divarication is large. The pubic bonesare stumpy, and the symphysis is short. The interspinous diameter ofthe false pelvis may be given as 55 cms., and the intercristal as 6 cms. The fcetal characters of the true pelvis are interesting. The canal issomewhat funnel shaped, and the pelvic brim is very oblique to thehorizon, a character due to the high level at which the promontory lies. Fig. 21.—Vertical sagittal section of pelvic region of full-time male foetus(section slightly to right of middle line anteriorly), a, Anal aperture ; b, bladder, greatly distended with urine ; c, opening of left ureter ; d, vesical trigone ; e, loop of sigmoid flexure in pelvis ; /, rectum ; g, coccyx ;h, third sacral vertebra ; i, prostate gland. above the symphysis. The plane of the pelvic outlet is practically parallelto the horizon. With regard to the pelvic measurements in the fcetus, somewhat conflicting statements are to be found. It seems generallyto have been accepted that at this time in life the antero-posteriordiameter at the brim, instead of being less, is greater than the trans-verse ; but both Sir William Turner and A. Thomson have found thatthe foetal pelvis is platypellic, and does not, therefore, differ inthis respect from the adult. In my own observations I found thatwhile the diameter from the promontory to the symphysis had alwaysa greater length than the transvers