Contributions to the comparative myology of the chimpanzee / by Burt G. Wilder.

  • Wilder, Burt G. (Burt Green), 1841-1925.
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: Contributions to the comparative myology of the chimpanzee / by Burt G. Wilder. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    mo-humeralis in each of the two Cynocephali and three Macaci which I dissected, and it is not mentioned as ab- sent in the others. It is generally inserted over the ten- don of the Latissimus dorsi, and would thus serve either to wrinkle the skin, or to assist the latter muscle to flex the humerus, as in climbing. Digastricus. The anterior belly is much broader than in man, being composed of two portions, — one external, next the jaw bone, rounded and more directly connected with the tendon, — the other internal and twice as broad, reaching to the middle line to join that of the opposite side. The two muscles fill the space between the rami of the jaw. Sterno-mastoid. Wholly distinct from Cleido-mastoid. Occipital portion very broad, the aponeurotic attachment reaching from just behind the ear to the middle line on the superior occipital crest. Thence downward it gradually becomes narrower, thicker, and more rounded, crossing the Cleido-mastoid to be inserted by a short, round tendon into the manubrium, as in man. Cleido-mastoid. This is smaller than the preceding, and the reverse in shape, the small end being above, and at- tached to the skull just within the anterior edge of the Sterno-mastoid, while the lower end is wider and inserted into the upper border of the clavicle, near the sternum. In the Gorilla, according to Duvernoy, the sternal portion of the Sterno-cleido-mastoid is very small, the whole ap- pearing as one muscle, which is almost wholly attached to the clavicle, and there are not two separable portions ; but in Prof. Wyman's specimen it resembled that of this Chimpanzee. Trapezius. I noticed no difference in this from the hu- man, except that its lower border, instead of overlapping the upper border of Latissimus dorsi, seemed to be con- tinuous with it, as mentioned by Vrolik, who says that