. Cunningham's Text-book of anatomy. Anatomy. THE CARPUS. 217 Fuses with shaft 1S-20 years. month of intra-uterine life. At birth the shaft is well formed; its proximal and distal extremities are capped with cartilage, and the tuberosity is beginning to appear. A secondary centre appears in the cartilage of the distal extremity about the second or third year; this does not unite with the shaft until the twentieth or twenty-fifth year, somewhat earlier in the female. From this the carpal and ulnar articular surfaces are formed. The centre for the head appears from the fifth to the seventh year,
. Cunningham's Text-book of anatomy. Anatomy. THE CARPUS. 217 Fuses with shaft 1S-20 years. month of intra-uterine life. At birth the shaft is well formed; its proximal and distal extremities are capped with cartilage, and the tuberosity is beginning to appear. A secondary centre appears in the cartilage of the distal extremity about the second or third year; this does not unite with the shaft until the twentieth or twenty-fifth year, somewhat earlier in the female. From this the carpal and ulnar articular surfaces are formed. The centre for the head appears from the fifth to the seventh year, and fuses with the neck about the age of eighteen or twenty. It forms the capitular articular surface and combines with the neck to form the area for articulation with the radial notch of the ulna. A scale-like Appears about 2-3 years Unites with shaft 20-25 years At Birth. About 12 years. About 16 years Fig. 208.—The Ossification of the Radius. epiphysis capping the summit of the tuberosity has been described ; this ap- pears about the fourteenth or fifteenth year, and rapidly fuses with that process. I. Metacarpal OS TRIQTJETKUM THE BONES OF THE HAND. Sesamoid bones V. Metacarpal The bones of the hand, twenty-seven in number, may be conveniently divided into three groups:— (1) The bones of the wrist or carpus—eight in number. (2) The bones of the palm or metacarpus—five in number. (3) The bones of the fingers and thumb or phalanges—-four- teen in number. The Carpus. The ossa carpi (carpal bones) are arranged in two rows: the first, or proximal row, comprises from radial to ulnar side, the navi- cular ( scaphoid), os lunatum ( semi-lunar), os trituietrum ( cuneiform), and os pisifonne or pisiform; the second or distal row includes the greater mult- angular ( trapezium), lesser multangular ( trapezoid), os capitatum ( os magnum), and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectanatomy, bookyear1914
