438 FUNCTIONS OF THE SENSORIUM COMMUNE, [ch. iv. 



the ganglia are extinguished in the ganglia themselves? or 

 whether being reflected there by a fixed law, they return 

 again along the nerves to the parts to be moved ? The cele- 

 brated Unzer/ and the eminent Winterl taught, that ex- 

 ternal impressions are reflected in the ganglia, as they are 

 reflected in the sensorium commune, and that the ganglia are 

 special sensoria, — a doctrine which does not appear altogether 

 destitute of probability. For, if we consider that the minute and 

 invisible nerves disseminated over the internal membrane of the 

 heart and auricles, perceive the stimulus of the inflowing venous 

 blood/ and although they cannot transmit the impression of 

 that stimulus to the sensorium commune through the ganglia of 

 the intercostal [great sympathetic] nerve, yet communicate it 

 to the motor nerves distributed through the substance of the 

 heart [ventricles] and auricles, it follows that there is neces- 

 sarily a consensus between the sensory nerves distributed on 

 the inner membrane of the heart and the motor nerves dis- 

 seminated through the substance of the heart [ventricles] and 

 auricles, which must take place either in the ganglia of the 

 intercostal nerve or below them, in the communicating branches 

 or plexuses of nerves. It seems probable, therefore, that 

 besides the sensorium commune, which we conjecture to be in 

 the medulla oblongata, medulla spinalis, pons varolii, and crura 

 of the cerebrum and cerebellum, there are special sensorna in 

 the ganglia and plexuses of the nerves in which external im- 

 pressions ascending along the nerves are reflected, that need 

 not ascend all the way to the sensorium commune, to be reflected, 

 thence. 



' Erste Griinde einer Physiologic, &c. 

 2 Haller, De Part. Corp. Hum. Fabr. 



