The myology of the upper and lower extremities of Orycteropus capensis / by John Charles Galton.

  • Galton, John Charles, 1840-
Date:
[1868]
Catalogue details

Licence: Public Domain Mark

Credit: The myology of the upper and lower extremities of Orycteropus capensis / by John Charles Galton. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    15/46 page 581
    nent seules la tete du premier m6tacarpien. Le muscle ne pent done agir directement sur le pouce; il est, avant tout, un muscle de la station.” May not the above-described insertion of the terminal tendon principally into the trapezium, while but few of its fibres pass to the metacarpal of a pollex which, though somewhat feeble, must still be ranked among the range of digits \ either be looked upon as the soon-to-he-cast-off appendage of an already useless member, or be regarded in the light of a preparation for a yet more rudimentary, or rather decadent, condition of the pollex, such as exists in the Orycteropus, in which animal the sole representatives of this digit are two diflicult-to-be-discovered, seemingly insignificant ossicles ^ ? In the Guineapig, in which the pollex is absent, the tendon of the extensor ossis meta- carpi pollicis, according to Mr. Mivart and Dr. Murie ^ “ runs on to the base of the metacarpal of the index, though mainly inserted into the rudimentary trapezium.” According to Prof. Huxley, while the tendon only of this muscle is divided in the Gorilla, Orang, and Gibbon, this division involves the muscle itself in the Chimpanzee Soemmering has noticed in man besides the simple splitting of the tendon, the actual division of the muscle itself. Theile has recorded that this muscle has sometimes been observed in man to be divided into two parts along its whole extent Extensores primi et secimdi mternodii pollicis.—These muscles are, as might be expected, absent. Extensor indicis.—Arises from the middle third of the strong internal ridge, or margin, of the ulna, immediately anterior to the insertion of the external portion of the triceps^ lying, also, immediately to the outer side of the extensor ossis metacarpi pollicis, at the origin of this latter. After this, it rapidly narrows, and its tendon, on reaching the articulation of the radius and ulna, runs under a ligamentous bridge stretching between the adjacent corners of the extremities of these bones, and passes on to the dorsum of the hand, underneath the three branches of the common extensor tendon. At a short distance from its termination, it divides into two slips, which are inserted into the bases of the proximal phalanges of the index and “ middle ” digit respectively. Extensor communis digitorum.—Arises from the lower part of the “ supinator ridge” of the humerus, overlapping here the lower half of the origin of the extensor carpi radialis— also from the tubercle upon the external condyle, which gives origin to the supinator brevis, being fused at this point of origin with the extensores annularis and minimi digiti. Shortly before it arrives at the distal extremity of the radius, the muscle divides into two bellies, which become tendinous on passing under the annular ligament common to them and to the tendon of the extensor indicis. The ulnar tendon, at the carpo-metacarpal ‘ Pouchet remarks, in a kind of preface or introduction, op. cit. p. 3, “ Le premier doigt est grele, un peu detache des autres, mobile. On peut lui donner le nom Ae pouce. ^ Cuvier says, “ Le premier os du second rang [of the carpus] est un trapeze auquel s’attachent deux tres-petits os, seuls vestiges du pouce.”—Ossemens Fossiles (nouvelle edit. Paris, 1823), tome v. p. 135. ® “On the Anatomy of the Crested Agouti,” Proc. Zool. Soc. June 1866, p. 404. * Lect. Coll. Surg. See Med. Times and Gazette, 1864. ® De Corp. Human! Eabr. vol. iii. p. 239. ® Encyclop. Anat. (Paris, 1843), tome iii. p. 232.
    digitised image 1
    digitised image 2
    digitised image 3