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.
87/118 page 407
![It passes downwards through the neck on the scalenus anticus and it enters the thorax between the subclavian artery and vein. Its general relations to the aortic arch, vagus, heart, and root of the lung are the same as in Man. Close to the diaphragm it divides into live branches which subdivide. Some of these supply the thoracic surface of the muscle, but others pass through it to Text-figure 47. The cervical plexus. C1-C 5 : cervical nerves. Other letters in text. supply the abdominal surface. It is accompanied by an artery and a vein. It gives branches to the pleura and pericardium, and communicates with the phrenic sympathetic plexus, but I did not trace branches of this anastomosis to the inferior vena cava, hepatic, and suprarenal plexuses. No arteria comes nervi phrenici was seen. The Brachial Plexus (text-fig. 48). The plexus is formed by the lower four cervical and first dorsal nerves as in Man, but the arrangements differ. Before they form the plexus C 5, C 6, and C 7 give off the three roots of the long thoracic nerve (L.T.N), and a well-marked branch runs from the upper root to the first digitation of the serratus magnus (Serr. Mag). C 7 and 0 8 also give twigs to the scalenus anticus {Seal. Ant.). C 5 unites with the anterior division of C 6 after giving off 1. A nerve to the levator anguli scapulae (L.A.S), the rhomboidei (R.M) and the first digitation of serratus magnus (S.A.M); 2. the suprascapular nerve (S-S.N). As C 5 joins a division of C 6 there is no upper trunk as in Man. 0 6 divides into anterior and posterior divisions. 27# [85]](https://iiif.wellcomecollection.org/image/b2982123x_0001_0087.jp2/full/800%2C/0/default.jpg)
