Human Anatomy Part 1 - K. A. Dyubenko, A. K. Kolomiytsev, Yu. B. Chaykovsky 2002

Special Part
Bones of the lower limb, ossa membri inferioris
Lower limb girdle - Pubic bone

The pubis (pubic bone), os pubis [pubis], consists of three parts (see Fig. 67): the body, corpus ossis pubis, and the superior and inferior rami, ramus superior et ramus inferior ossis pubis. The body of the bone forms the anterior section of the obturator foramen, which passes directly into the superior ramus. The upper margin of this ramus is sharp and is called the pubic crest, crista pubica. The anterior sections of the crest terminate in the pubic tubercle, tuberculum pubicum. The lower margin of the superior ramus is called the obturator crest, crista obturatoria. The anterior section of the superior ramus transitions at an angle into the inferior ramus. Located on its medial surface is the symphysial surface, facies symphysialis. Together with the ischium, the rami of the pubis bound the obturator foramen, along the upper margin of which runs the obturator groove, sulcus obturatorius, transmitting the corresponding Vessels and nerves.

Ossification. The hip bone has three primary ossification centers: the first ossification center appears during the 9th week of intrauterine development in the ilium; in the 4th month, in the body of the ischium; and in the 5th month, in the body of the pubis. In a newborn, all three PARTS OF THE hip bone are separated within the acetabulum by Cartilage layers. By the 8th year of life, the inferior rami of the ischium and pubis fuse, and at 14–16 years of age, the bodies of all three bones fuse to form the acetabulum. Between the 12th and 19th years, additional ossification centers appear in the area of the iliac crest, ischial tuberosity, and ischial spines, which unite with the main mass of the bone between the 20th and 25th years of life.