THE GREAT SYMPATHETIC, OR GANGLIAL NERVE. 303 
inquires, whether the compression of these nerves, by the enlarge¬ 
ment of these ganglia, may not explain some cases of roaring, 
so frequent in the horse. If this hypothesis is founded on truth, 
the anastomoses in the ox between the recurrents and the supe¬ 
rior laryngeals may well explain the rareness of this disease in 
the ox. 
Journal de Vet. du Midi, Fevrier 1838. 
THE GREAT SYMPATHETIC, OR GANGLIAL NERVE, 
(LE NERF TRISPLANCHNIQUE). 
/ 
From the Lectures (^'MM.Gelle and Lafore, 0/ the Toulouse 
School, 
This nerve forms a complete system of its own. It presents 
at different points various ganglia, which are considered by 
physiologists as so many centres of nervous influence, and from 
which proceed branches by which the ganglia are reciprocally 
connected tosether—branches which are distributed to certain 
organs, and those which unite the organic system with the 
cerebro-spiual. 
The physiological importance of this nerve cannot for a 
moment be doubted. It forms ganglionic plexuses at the origin 
of the principal arterial trunks, and it sends branches to every 
organ of involuntary action and function. 
It had been long believed that the lungs were an exception to 
this general rule, and that they did not receive any filaments 
from the ganglial nerve; but a careful dissection of a horse, 
made by M. Ilugier in 1833, proved the contrary. This skilful 
anatomist demonstrated a branch of the trisplanchnique pro¬ 
ceeding from one of the three first thoracic ganglia, and di¬ 
rected to the bronchial plexus, which it contributes to form by 
uniting with some of the divisions of the pneumo-gastric. 
The Toulouse school has since taught that this branch some¬ 
times emanates from one of the inferior cervical ganglia. 
Another anatomical fact, the discovery of which we claim for 
our school, is the existence of another branch of the trisplanch- 
nique not before observed. It proceeds from one of the in¬ 
ferior cervical ganglia, and unites itself with the diaphragmatic 
(phrenic) nerve, and which is itself formed by the union of two 
branches [iroceeding from the sixth and seventh cervical nerves. 
This anatomical point has been often verified in dissections of 
the horse and the ox. Possibly this may furnish new light to 
the physiologist in the explication of the important function of 
respiration. 
Journal des Velcrinaires du Midi, Avril 1838. 
