. Radiography, x-ray therapeutics and radium therapy . e commences between thethird and fourth years, and a year later in those of the second and third two centres become united in each row between the eighteenth andtwentieth years. The Os Innominatum is a large, irregularly shaped bone, which,with that of the opposite side, forms the sides and anterior walls of thepelvic cavity. In yomig subjects it consists of the separate parts whichmeet and form the large cup-shaped cavity situated near the middle of theouter side of the bone ; and although in the adult these have become united,it
. Radiography, x-ray therapeutics and radium therapy . e commences between thethird and fourth years, and a year later in those of the second and third two centres become united in each row between the eighteenth andtwentieth years. The Os Innominatum is a large, irregularly shaped bone, which,with that of the opposite side, forms the sides and anterior walls of thepelvic cavity. In yomig subjects it consists of the separate parts whichmeet and form the large cup-shaped cavity situated near the middle of theouter side of the bone ; and although in the adult these have become united,it is usual to describe the bone as divisible into three portions : the ilium,the ischium, and the pubes. Development takes place by eight centres: threeprimary, one for the ilium, one for the ischium, and one for the pubes; andfive secondary, one for the crest of the ilium, one for the anterior inferiorspinous process (said to occur more frequently in the male than in the female),one for the tuberosity of the ischium, one for the symphysis pubis (more. PLATE VIII.—Normal Knee-joint. a, Normal knee-joint, lateral view. h, Knee-joint in young adult, irregularity in region of tubercle of tibia. c, Normal knee-joint, antero-posterior. THE LOWER EXTREMITY 141 frequent in the female than in the male), and one for the Y-shaped piece atthe bottom of the acetabulum. These various centres appear in the following order : (a) in the ilium,immediately above the sciatic notch, at about the same period as the develop-ment of the vertebrae commences ; (b) in the body of the ischium, at about thethird month of foetal life; and (c) in the body of the pubes, between the fourthand fifth months. At birth the three primary centres are quite separate,the crest, the bottom of the acetabulum, and the rami of the ischium andpubes being still cartilaginous. At about the seventh or eighth year therami of the pubes and ischium are almost completely ossified. About thethirteenth or fourteenth year the thre
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