On the myology of Hyrax capensis / by James Murie and St. George J. Mivart.

  • Murie, James.
Date:
[1865]
Catalogue details

Licence: Public Domain Mark

Credit: On the myology of Hyrax capensis / by James Murie and St. George J. Mivart. 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.

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    The extensor minimi diyiti arises as usual (Fig. 5, E. m. d,), but soon divides into two separate delicate muscles, each of which ends in a tendon, one being inserted into the proximal phalanx of the fifth digit; the other, passing beneath the outermost tendon of the extensor communis digitorum, goes to the distal end of the fourth metacarpal bone. Meckel found only a single tendon, which went to the fifth digit*. The extensor ossis metacarpi pollicis is a well-developed muscle, with rather an extensive origin, and with much tendon in its sub- stance. It is inserted into the trapezium and rudiments of the pollex. The extensor primi, the secundi internodii, and the extensor indicis are all wanting. The extensor carpi ulnaris has origin from the outer side of the coronoid process of the ulna and the outer condyle of humerus, but chiefly from the latter. Its insertion is into the proximal end of the fifth metacarpal and the pisiform bone. The pronator teres arises from the internal condyle, as usual. The insertion is by a flattened and pretty strong tendon into the middle of the shaft of the humerus, at its inner side. The flexor carpi radialis arises from the inner condyle, below the last. This muscle, which is tendinous at its lower half, is inserted into the trapezium. The palmaris longus is rather largely developed, and arises from the inner condyle and intermuscular fascia. Passing down to the palm of the fore limb, it forms the palmar fascia, which contains a flat fibro-cartilagiuous disk, the palmar fascia ending in four slips for the four digits. At the carpus, a bursa is interposed between the tendon of this muscle and that of the flexor carpi ulnaris. Meckelf says that this muscle is only represented by a long, wide tendon; but in our specimen it had a good fleshy belly. The flexor carpi ulnaris is a very strong muscle, with the usual origin, and inserted into the pisiform bone by a very broad tendon, the muscular fibres on the outer side reaching down to that bone (fig. 6, F. c.u.). The flexor sublimis digitorum arises in intimate union with the deep flexor as far nearly as the carpus, but is divisible into three slips, each of which gives off a tendon, these three tendons going to the second, the third, and the fourth digits; that iuto the second is in- serted in the inner side of the tendon of the deep flexor; that to the third forms its perforated tendon; that to the fourth unites with a tendon of the next muscle to form the perforated tendon of that digit. Meckel's description does not at all agree with our description (fig. 6, F. s. d.). Flexor brevis manus.—This very peculiar and, as far as we know, hitherto undescribed muscle arises from the fibro-cartilaginous disk above mentioned, and from both the superficial and the deep palmar fasciae. It divides into three distinct and rather long digi- tations, each ending in a tendon. These three tendons go to the second, fourth, and fifth digits; that going to the fourth digit unites * Loc. cit. p. 321. + Loc. cit. p. it 17. [13]