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.
90/118 page 410
![on the extensor aspect of the forearm. Finally it sends a long, fine nerve to the wrist joint. The internal cutaneous and lesser internal cutaneous nerves arise from the conjoined median and ulnar nerves in the brachial plexus. They are distributed as in Man. The intercosto-humeral nerve is as in Man. The Lumbar and Sacral Plexuses (text-fig. 49). The lumbar plexus is formed by the anterior primary divisions of the four lumbar nerves, the sacral plexus is formed by the Text-figure 49. Q.F. The lumbo-sacral plexus. DXIII-S2: nerves forming the plexus proper; S3 and S4, not shown in the diagram, supply pelvic muscles; Pyr: nerves to pyri- formis; H.M. and Q.F : nerves to the hamstring muscles and quadratus femoris. Other letters in text. anterior primary divisions of the four sacral nerves, The two plexuses are connected by the lumbo-sacral cord from the third and fourth lumbar nerves. Hepburn (24) gives the cord as coming from the fourth lumbar, Champneys (ll) records a totally different formation of the plexuses, but does not mention the cord. Folk (7) showed that there are slight variations in different animals. The following table shows the origins of the nerves as observed by myself and others :— r88]](https://iiif.wellcomecollection.org/image/b2982123x_0001_0090.jp2/full/800%2C/0/default.jpg)
