The =symphysis pelvis= is formed by the junction of the two ossa coxarum
at the ventral median line. In the young subject the bones are united by
a layer of cartilage; in the adult the latter is gradually replaced by
bone, the process beginning in the pubic portion and extending backward.
The union is strengthened by white fibrous tissue above and below, and a
transverse band also covers the anterior border of the pubis (pecten).
No appreciable movement occurs even before synostosis takes place.