. Anatomischer Anzeiger. Anatomy, Comparative. 211 Nachdruck verboten. An Os centrale (Rosenberg) partially united to the Scaphoid. By William Wright. With one Figure. The above anomalous condition of an accessory carpal bone was met with in the left hand of a male subject during its dissection in the anatomical rooms of the Birmingham University. The Os centrale had the shape of a rounded pyramid, the apex pointing outwards and backwards the base forwards and inwards: its height and maximum breadth each measured 9 mm. The base of the pyramid articulated with the Os magnum, the inferior surfac
. Anatomischer Anzeiger. Anatomy, Comparative. 211 Nachdruck verboten. An Os centrale (Rosenberg) partially united to the Scaphoid. By William Wright. With one Figure. The above anomalous condition of an accessory carpal bone was met with in the left hand of a male subject during its dissection in the anatomical rooms of the Birmingham University. The Os centrale had the shape of a rounded pyramid, the apex pointing outwards and backwards the base forwards and inwards: its height and maximum breadth each measured 9 mm. The base of the pyramid articulated with the Os magnum, the inferior surface with the trapezoid, the other articulating surfaces which were rounded and convex with the scaphoid, the bone being received into a hollow on its infero-internal aspect. Dorsally it was united with the scaphoid but on levering it out of its bed it readily detached itself from that bone in a way incompatible with a strong osseous union. It did not appear on the dorsal aspect of the carpus owing to its being covered by a thin lamina of bone which projected inwards from the scaphoid; so thin was the lamina that its origin — in part at least — from an adventitious ossification of a dorsal ligament was suggested. The articulating surfaces were cartilaginous and smooth, the synovial cavity between it and the scaphoid being disposed as is seen in the sketch of the bones taken from the antero-internal aspect. In looking through the English literature on the subject I have only been able to discover one undoubted case of this variety of Os centrale whilst none of the other three varieties of ossa centralia to which Pfitzner and Thilenius have directed attention have so far as I know been reported. The case above mentioned was described by Sir William Turner in 1883 and closely resembles the one here noted although the os centrale was quite free and appeared on the dorsal aspect of the carpus, the dorsal surface of it and the scaphoid being connected by a liga- Scaphoid and Os cent
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