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.

    5/46
    The clavicular portion of the muscle is, moreover, wanting, according to Pfeilfer^ in many Apes and Lemurs, in Bats, in the Hedgehog, Hystrix, and Arctomys. The acromio-basilar is very distinct, and is fairly developed. It takes origin from the lateral ridge of the supraoccipital bone, and passes thence obliquely downwards and outwards to be inserted tendinously into the strong downwardly directed tubercle at the base of the acromion—“ metacromial process ” of Parker^. Not far from its termination it passes over that part of the occipital division of the trapezius which is detached to join the fascia of the arm. Cuvier evidently considered this muscle to be a factor of the trapezius, seeing that it is lettered by him in his plates® as its “ portion cervicale.” According to MeckeP the acromio-basilar, to which he has given no distinct desig- nation, is to be regarded, either as a portion of the trapezius, or as a muscle sui generis. The first of these views, he holds, receives support from the arrangement of the muscle in the Otter, in which animal it springs from the internal face of the trapezius—this latter being consequently differentiable into an external and internal layer. He does not agree with Cuvier that it is a levator scapulce carried far forward, because, 1, of its coexistence with that muscle in all animals where it is present; 2, of its superficial position in the Makis and certain Apes. Church® found a representative of this muscle in the Orang; and Wagner, according to Henle®, discovered in the human subject an accessory portion of the trapezius which passed to the acromion from the mastoid process. Levator claviculce.—A fairly developed muscle, which takes origin from the strong fibrous aponeurosis covering the occipito-parietal region of the skull, immediately to the outside of the origin of the preceding muscle. It then runs along close to the outer edge of the cleido-mastoid, and parallel with it, and is inserted into the clavicle, just external to the terminal portion of the muscle. Cuvier gives a very fair representation of it on the right side of his figure (pi. 260, Anat. Comp.), but attaches to it neither letter nor sign. Cleido-mastoid.—Is a comparatively broad and flat muscle, arising from the mastoidal portion of the temporal bone, posterior to, and overlapped by, the origin of the sterno- mastoid. It passes down, slightly and gradually diverging from this muscle, to be inserted into the sternal third of the clavicle, a slight interval being left between the inner limit of its insertion and the sterno-clavicular articulation. Sterno-mastoid.—Arises from the mastoid process of the temporal bone, in close con- tiguity to, but covering, the preceding muscles at origin. Though running in company with the above at first, it gradually parts company, and is finally inserted along the upper edge of the manubrium. Certain fibres, however, which are derived from the anterior free edge of the muscle, are continued over the pectoralis major, to meet a similar prolongation from the sterno-mastoid of the opposite side, and to be finally * Ziir vergleichenden Anatomie der Schultergeriistes tind Schultennuskeln. Hermann Pfeiffer. Giessen, 1854: p. 13. “ Vide A Monograph on the Structure and Development of the Shoulder-girdle and Sternum in the Vertebrata. Ray Soc. 1868: p. 203. “ Anat. Comp. pi. 259. fig. 2. * Op. cit. p. 481. ’ Loo. cit. p. 512. ® Loc. cit. p. 24.