464 GENERAL ANATOMY. 



consider it successively as a whole, and in its principal parts, 

 referring the details to special neurology. 



SECTION I. 



OF THE NERVOUS SYSTEM IN GENERAL. 



741. The nervous system* forms a continuous whole, rami- 

 fied and reticulated, all the parts of which are connected. 



742. This system consists in a central mass, in nervous 

 cords, and in ganglions. 



The central nervous mass, which has not received a particu- 

 lar name, and which is designated by the term of brain in 

 general, and sometimes by that of nervous axis, or cerebro- 

 spinal organ, consists of several parts which are distinguished 

 by their situation, into spinal marrow or rachiform cord 

 ('PcytM^s ^wTtos) and into encephalon (Efxt^axos); by their form 

 and texture, into nervous medulla, and into cerebrum, cere- 

 bellum, and tuberculaquadrigemina; the rudimentary olfactory 

 lobes are regarded as nerves. 



The spinal marrow is a large cord single and median, di- 

 vided by a double furrow, into two lateral portions, and by 

 the insertion of the ligamenta dentata^ into anterior and poste- 

 rior fascicles. This cord contained in great part within the 

 vertebral canal, extends into the cranium, and bears there the 



* Th. Willis, Cerelri anatomc nervorumque descriptio et usus, Genevse, 

 1676. R. Vieussens, Neurographiauniversalis; Lugd. 1684. G. Prochaska, 

 de structurd nervorum tract, anat.; Ejusd. Comwentatio de function, system, 

 nerv.f in op. minor. Vicq-d'azyr, liech. sur la struct, du cerveau, du ccrvelet, 

 de la moelle allongee, de la moelle c'piniere, et sur Furigine dcs nc?'fs, &c.; in 

 Mem. de 1'acad. dessc. de Paris, 1781 and 1783. A. Munro, Observ. on the 

 nervous system,' Edinb. 1783. Litdwig 1 , /Scriptorcs neurologici minores eelecti, 

 &?e.y Lipsiae, 1791-95, 4to. F. G. Gall and Spurzheim, liech. sur ksi/- 

 nerv. en general, etsur cclui de cerveait enpartioulicr,- Paris, 1809. Rolando, 

 Saggio sulla vera struttura del cevrello ddl 'uomo e degli animale, e sopra le 

 funzioni del sistema nervoso,- Sassari, 1809. Cams, Anat. und physiol, dc? 

 nervcn systems; Leipzig 1 , 1814. 



