A comparison of the shoulder bones and muscles with the pelvic bones and muscles / by Professor Humphry.

  • George Murray Humphry
Date:
[1870?]
Catalogue details

Licence: Public Domain Mark

Credit: A comparison of the shoulder bones and muscles with the pelvic bones and muscles / by Professor Humphry. Source: Wellcome Collection.

    18/24 page 84
    the levator scapulae and the supra-spinatus. The cervico-hume- ral does not usually answer to the conditions; but it is extremely interesting to note that in Phoca (Vol. II. 299) one portion of this muscle extends from the transverse process of the atlas to the anterior angle of the scapula, and overlaps the supra- spinatus, thus presenting very close homological relations to the psoas parvus; and in that and some other animals an extension of the levator scapulae into the fascia over the supra- spinatus remind us of the relations of the psoas magnus to the iliacus internus. We come now to the muscles passing from the shoulder and the pelvic girdles to the humerus and the femur. They may be divided into dorsal and ventral, anterior and posterior, which are disposed accordingly upon the dorsal and ventral, the anterior and posterior aspects of the shoulder-girdle and humerus, and the pelvic girdle and femur. The dorsal series of girdle-muscles in the fore-limb consists of the deltoid, infraspinatus and teres minor. The deltoid passes from the spine of the scapula, the acromion, and the outer part of the clavicle to the extensor or dorsal aspect of the radial line of the humerus, nearly opposite to the attachment of the pectoral. It sometimes (Orycteropus) extends with the flexor of the forearm to the radius, and in Manis it joins the supinator radii longus1. It seems to be represented by the sartorius, which arises from the anterior iliac spine often extending upon Poupart’s ligament, and is inserted either into the dorsal aspect of the tibial line of the femur internal to the vastus internus, or passes down to the tibia, meeting the gracilis much as the deltoid meets the pectoral. I may observe that the occasional 1 Journal of Anat. iv. 36 and 40. The extensor plicce alaris of the bird may also be regarded as a derivation from the deltoid to the supinator and the radial edge of the wing. The clavicular and the scapular parts of the deltoid are not unfrequently separate ; and the latter sometimes blends with the triceps (see Pteropus, Journal of Anat. in. 305). This part may be represented by the tensor vagince femoris, which is sometimes inserted into the dorsal aspect of the femur. In Manis, the sartorius, tensor vagince femoris, and gluteus maximus are con¬ tinuous ; and in that animal the supinator longus extends up to the spine of the scapula, displacing the fore part of the deltoid, reminding us of the connection of the supinator with the deltoid in the bird, and suggesting the serial homolo¬ gical relation of that connecting portion and of the extensor plicce alaris with the sartorius. See Disposition of Sartorius, in Yol. iv. 55.
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