Volume 1
On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag.
- Sonntag, Charles F. (Charles Frederick), -1925
- Date:
- 1923
Licence: In copyright
Credit: On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag. Source: Wellcome Collection.
4/118 page 324
![Total length of pectoral extremity Great trochanter to centre of patella ... Centre of patella to lower end of tibia ... Foot (sole 4’6 ins.: middle digit 2*8 ins.) Total length of pelvic extremity Excess of pectoral over pelvic extremity 25-7 inches 9-1 7-6 7-4 24*1 1-6 5? ,, , 1 11 11 The Muscular System. Muscles of the Head, Heck, and Backj The platysma myoides (text-fig. 25) is much thicker than in Man. It arises from the fascia over the pectoralis major and deltoid, and the two muscles are inseparable in the middle line of the neck. Its lateral parts are more muscular and thicker than the medial portions. About an inch below the symphysis menti the fibres of the mesial parts decussate (Ruge 42, Champ- neys ID, and I observed the fibres of the left muscle lying super- ficial to those of the right one; but Quain describes the reverse Text-figure 25. Superficial muscles of the face. ORB.OC : orbicularis oculi; ORB.ORIS : orbicularis oris. Other letters in text. condition in Man. The fibres are attached to the lower border of the mandible, the skin of the lips, and the muscles of the lips and angles of the mouth. But no fibres are attached to the zygoma as described by Champneys. In the face it separates into upper and lower bundles of fibres ; the former, corresponding to the risorius in Man, runs to the muscles at the angle of the mouth ; and the latter, which is much larger, blends with the skin and muscles of the lower lip. Small fibres, running from the platysma to the angle of the mouth, correspond to the triangularis muscle {tri.). [2]](https://iiif.wellcomecollection.org/image/b2982123x_0001_0004.jp2/full/800%2C/0/default.jpg)
