. Cunningham's Text-book of anatomy. Anatomy. At birth. About 5 years. Fig. 201. About 12 years. -Ossification of the Humerus. About 16 years. 8. Centre for smaller tubercle fuses with other.' centres about 7 years. 9. Appears about 11 or 12 years. 10. Inferior epiphysis fuses with shaft about 16 to 17 years. 11. Superior epiphysis fuses with shaft about 25 years. 12. Fuses with shaft about 17 to 18 years. 1. Appears early in 2nd month fcetal life. 2. For larger tubercle, appears 2 to 3 years. 3. For head, appears within first 6 months. 4. For medial epicondyle, appears about 5 years. 5. For c
. Cunningham's Text-book of anatomy. Anatomy. At birth. About 5 years. Fig. 201. About 12 years. -Ossification of the Humerus. About 16 years. 8. Centre for smaller tubercle fuses with other.' centres about 7 years. 9. Appears about 11 or 12 years. 10. Inferior epiphysis fuses with shaft about 16 to 17 years. 11. Superior epiphysis fuses with shaft about 25 years. 12. Fuses with shaft about 17 to 18 years. 1. Appears early in 2nd month fcetal life. 2. For larger tubercle, appears 2 to 3 years. 3. For head, appears within first 6 months. 4. For medial epicondyle, appears about 5 years. 5. For capitulum, appears 2 to 3 years. 6. Appears about 12 years. 7. Centres for head and larger tubercle coalesce about 5 years. Sexual differences.—Dwight (American Journ, of Anat, vol. iv. 1904) has shown that the head of the humerus in the female is proportionately smaller than that of the male. Ossification.—At birth the shaft of the humerus is usually the only part of the bone ossified, if we except the occasional presence (22 per cent) of an ossific centre in the head. (H. R. Spencer, Journ. Anat. and Physiol, vol. xxv. p. 552.) The centre for the shaft makes its appearance early in the second month of intra-uterine life. "Within the first six months after birth a centre usually appears for the head; this is succeeded by one for the larger tubercle during the second or third year. These soon coalesce; and a third centre for the smaller tubercle begins to appear about the end of the third year, or may be delayed till the fourth or fifth year. These three centres are all blended by the seventh year, and form an epiphysis, which ultimately unites with the shaft about the age of twenty-five. It may be noticed that the proximal end of the diaphysis is conical and pointed in the centre, over which the epiphysis fits as a cap, an arrangement which thus tends to prevent its displacement before union has occurred. The first centre to appear in the distal extremity is that for t
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