On the difference in the mode of ossification of the first and other metacarpal and metatarsal bones / by Allen Thomson.

  • Thomson, Allen, 1809-1884.
Date:
[1868?]
Catalogue details

Licence: Public Domain Mark

Credit: On the difference in the mode of ossification of the first and other metacarpal and metatarsal bones / by Allen Thomson. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

    18/20
    14G PROF. THOMSON. METACARPAL AND METATARSAL BONES. wet state ; d\ a strip of cartilage di])ping inwards about a third through the thickness of the bone indicates the partial separation of a distal epi|)hysi3. Fig. 2'. I. A similar section of the fii-st metacarpal bone from the hand of another child of nearly the same age, in which at it a very slight degree of inward ja’ojection of the epiphysal cartilage exists. Fig. 2'. II. Transverse section of the proximal half of the second metacarpal bone represented in Fig. 2, showing at p a slight indentation of the cartilage on the inner side, indicating the tendency to the formation of a partial epii)hysi8. Fig. 3. Dorsal view of the dried first and second metatarsal bones and the digital phalanges of the great and second toes from the left foot of the same subject as the hand represented in Fig. 1, of eight years of ago : at d', d', deep fissures indicate the sepamtion of a distal epiphysis. Fig. 4. Antero-posterior longitudinal section of the first and second metatarsal bones and the digital phalanges of the great and second toes in the wet state, from the same child as the si)ecimens represented in Fig. 2, of seven years of age : at d\ a comj)lete, but somewhat irregular plate of cartilage sepamtes the distal epiphysis on the first metatarsal bone. Fig. 4'. I. A similar section of the first metatarsal bone from the left foot of the same subject as the metacarpal bone represented in Fig. 2'. I, showing at d an inward projection of the dividing plate cartilage which partially separates a dist^ epiphysis. Fig. 5. Longitudinal and vertical sections of the first and second metatarsal bones and corresponding digital phalanges from the left hind-foot of a young seal in the wet state; three-fourths of the natural size; d' in the fii’st metatarsal bone, and in the first phalanx of the first toe, and in the first and second phalanges of the second toe, indicates the distal epiphyses existing in this animal. Fig. 6. Longitudinal and transverse section of a part of the right anterior limb of a young porpoise in the wet state: r, the lower end of the radius with its epiphysis; u, part of the ulna; I, II, III, the first, second, and third metacarpal bones; the second and third showing, in addition to the larger central ossified maas, both proxi- mal and distill epiphyses; 1 to 7, the cartilaginous and partially ossifi(;d phalanges of the third digit, showing, in the fir.st two, distal as well as proximal epiphyses; and in the third, fourth and fifth only the centnil nodule as yet ossified. In the first two phalanges of the second digit the same is shown as in the third.