. Radiography and radio-therapeutics . and from this point extends inwards, so as to form thechief part of the articular end of the bone, the centre for the inner part of thearticular surface not appearing until about the age of twelve. Ossificationcommences in the internal condyle about the fifth year, and in the externalone not until about the thirteenth or fourteenth year. At about sixteen orseventeen years the outer condyle and both portions of the articulatingsurfaces (having already joined) unite with the shaft. At eighteen yearsthe inner condyle becomes joined, whilst the upper epiphysi
. Radiography and radio-therapeutics . and from this point extends inwards, so as to form thechief part of the articular end of the bone, the centre for the inner part of thearticular surface not appearing until about the age of twelve. Ossificationcommences in the internal condyle about the fifth year, and in the externalone not until about the thirteenth or fourteenth year. At about sixteen orseventeen years the outer condyle and both portions of the articulatingsurfaces (having already joined) unite with the shaft. At eighteen yearsthe inner condyle becomes joined, whilst the upper epiphysis, although thefirst formed, is not united until about the twentieth year. The Ulna.—^Development takes place by three centres : one for theshaft, one for the inferior extremity, and one for the olecranon. Ossificationcommences near the middle of the shaft about the eighth week, and soonextends through the greater part of the bone. At birth the ends are carti-laginous. About the fourth year a separate osseous nucleus appears in the. ILATK XXll. NOHMAL LUMHAU SIMM; AM) ; (I, Normal lumbar , Normal male , Normal Ieinale pelvis.
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