The muscles of the fore and hind limbs in Dasypus sexcinctus / by John Charles Galton.

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

Licence: Public Domain Mark

Credit: The muscles of the fore and hind limbs in Dasypus sexcinctus / 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.

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    ligament passing from the above projection to the palmar boss of the os lunare and the ulnar margin of the scaphoid groove. Flexor sublimis digitorimi.—This muscle, which appears to be combined with the palmaris longus both homologically and functionally, arises from the lowest part of the inner condyle of the humerus, in company with two heads of the flexor profundus, and passes forwards, muscular for some distance, to blend finally with the palmar fascia, which is attached on one side to the pisiform bone, on the other to a small sesamoid which lies alongside of the scaphoid. Two digits only are supplied with a tendon from this muscle, namely, the index and middle digit, as Cuvier has figured, hut somewhat indistinctly, in one of his plates of Fasypus^. According to Meckel, however, the superficial flexor in the “Tatu” divides into three muscles—one for the pollex and index (the tendon of which previously splits deeply), one for the third, and the remaining factor for the fourth digit Theile, in noticing varieties of palmaris longus in the human subject, observes that its absence is sometimes supplied by a tendon of the flexor suhlinnis^. Flexor profundus digitorum.—An enormously powerful and complex muscle, made up of several elements—which may, however, be considered under two divisions, which are as follows:— 1. A large muscular mass which arises from the whole of the internal face (or palmar aspect) of the ulna, from the olecranon to within a short distance of the carpal extremity of the bone. After proceeding a little more than halfway on its course, it is joined, having already become tendinous, by a smaller, but still considerable muscular slip, which takes rise from the inferior surface of the inner condyle of the humerus, in company with the origin of the flexor suhlimis and another slip of the flexor presently to be described. The slip proceeding from the inner condyle is, soon after its origin, joined by another muscular mass, which arises from the coronoid process of the ulna, from the interosseous septum (between these two heads the ulnar tendon of the biceps and the tendon of the brachialis anticus dip down towards their insertion), and from the radial edge of the ulna. All these elements of the first muscular mass are continuous with an enormous tendon, in which, at the beginning of the palm, a large horseshoe-shaped sesamoid bone is developed. 2. Where the tendon joins the sesamoid, the latter is joined, but without the inter- vention of a tendon, by two muscular slips, the smaller of which arises from the inferior surface of the inner condyle of the humerus, in company with the superficial flexor, whose fibres of origin separate it from a slip which has the same origin but has been already described. On the radial side of the insertion of this slip the sesamoid is joined by a larger muscular element, which arises from the whole palmar surface of the radius, beginning at the neck of the bone, and bounded externally (that is, on its radial margin) by the insertions of pronator teres and supinator brems. Between the insertions of the two above-described masses into the sesamoid there