. Cunningham's Text-book of anatomy. Anatomy. THE PATELLA. 245 . v. *. Fuses with shaft ^Tpfrttf aboutlS-19 years first year Appears about 2-3 year month of fcetal life, and is of service from a medico-legal standpoint in determining the age of the foetus. According to Hartman, it is absent in about 12 per cent of children at term, and may appear as early as the eighth month of foetal life in about 7 per cent. The proximal extremity, entirely cartilaginous at birth, com- prises the head, neck, and trochanter major. A centre appears for the head during the early part of the first year. It is wo
. Cunningham's Text-book of anatomy. Anatomy. THE PATELLA. 245 . v. *. Fuses with shaft ^Tpfrttf aboutlS-19 years first year Appears about 2-3 year month of fcetal life, and is of service from a medico-legal standpoint in determining the age of the foetus. According to Hartman, it is absent in about 12 per cent of children at term, and may appear as early as the eighth month of foetal life in about 7 per cent. The proximal extremity, entirely cartilaginous at birth, com- prises the head, neck, and trochanter major. A centre appears for the head during the early part of the first year. It is worthy of note that this epiphysis has a double blood - supply — one through the neck, the other through the ligamentum teres. That for the tro- chanter major begins to ossify about the second or third year, whilst the neck is developed as a proximal extension of the shaft, which is, however, not confined to the neck alone, but forms the distal circumference of the articular head, as may be seen in bones up to the age of twelve or sixteen; after that, the separate epi- physis of the head begins to overlap it so as to cover it entirely when fusion is com- plete at the age of eighteen or twenty. The epiphysis of the greater trochanter unites with the shaft and neck about eighteen or nineteen, whilst the epiphysis for the trochanter minor, which usually makes its appearance about the twelfth or thirteenth year, is usually completely fused with the shaft about the age of eighteen. The epiphysis for the distal end, although the first to ossify, is not completely united to the shaft until from about the twentieth to the twenty-second year. It is worthy of note that the line of fusion of the shaft and distal epiphysis passes through the adductor tubercle, a point which can easily be determined in the living. The distal end is the so-called "growing end of the ;. Usually appears in the 9th month of foetal life. Please note that these images are extracted from scanned pag
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