Volume 1

On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag.

  • Sonntag, Charles F. (Charles Frederick), -1925
Date:
1923
Catalogue details

Licence: In copyright

Credit: On the anatomy, physiology, and pathology of the chimpanzee / by Charles F. Sonntag. Source: Wellcome Collection.

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    The extensor indicis arises from the inner surface of the lower fifth of the radius, and some fibres blend with the extensor longus pollicis. Its long, and very slender tendon blends with the dorsal expansion of the communis tendon to the index over the first phalanx. No slip goes to any other digit, as in Wilder s specimen (53). Hepburn (24), Macalister (33), and Humphry (26) found it supplying the medius too. The supinator brevis is wrapped round a little more than the upper third of the radius. It is musculo-tendinous. The extensor ossis metacarpi pollicis and extensor primi inter- nodiipollicis have a common origin from the bones of the forearm. The latter arises from the upper third of the lateral border of the ulna, and the former from the upper two-thirds of the mesial border of the radius. The tendons separate from the combined muscular mass. The broad tendon of the former runs to the trapezium and thumb sesamoid, and the slender tendon of the latter goes to the base of the metacarpal of the thumb. The extensor secundi internodii pollicis (extensor pollicis longus) arises from the third fourth of the inner surface of the shaft of the ulna below the extensor primi internodii pollicis and above the extensor indicis. Its long, ribbon-like tendon is inserted into the base of the ungual phalanx of the thumb. Hepburn (24) gives its insertion as the base of the first phalanx, but Humphry (26), Macalister (33), Vrolik (51), Wilder (53), and Wyman (54) recorded conditions as in my specimen. Interossei :—All authors agree that the dorsal interossei are as in Man, and several have described the six interossei on the palmar surface of the manus. Hepburn (24) has shown that three of the six muscles are the true palmar interossei, namely, those to the ulnar side of the index and the radial sides of the annularis and minimus. The others to the sides of the medius and ulnar side of the annularis are abductors, belonging really to the dorsal series. With his observations I am quite in agreement. The six palmar muscles form a very thick stratum. The con- ditions are shown di a grammatically in text-fig. 35 A. The first dorsal interosseous wraps round the metacarpal of the index. Taking the deep muscles from within outwards, we find :— 1. Opponens minimi digiti ; 2. palmar adductor interosseous to the minimus : 3. palmar abducting interosseous of the annu- laris ; 4. palmar adducting interosseous of the annularis ; 5. pal- mar interosseous deviating the medius to the ulna; 6. palmar interosseous deviating the medius to the radius ; 7. palmar ad- ducting interosseous of the index; 8. pollical head of the first dorsal interosseous covering the metacarpal of the index; 9. deep head of the flexor brevis pollicis. Muscles of the Anterior Abdominal Wall. The external oblique arises by well-marked digitations from the outer surfaces and lower borders of ribs 5-11. The mesial [30]
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