TIIK r/;.|.\7 I /. /; ENCEPHALIC \i:i:\ 7":: 



however tliis may be, this plate, which was ilU<->\ ; r. -.1 by Roiiget, at first in 

 reptiles, then in birds and mammals, lias been studied by several micro- 

 graphs, who arc sigrrcMl as to its e\i-t< MCI-. There cun, therefore, be no 

 doubt that it is the ultimate termination of the motir-nei 



The mode of termination of the sensitive nerves varies as they are 

 scnsorial or general sensibility nerves. It appears to be demonstrated that the 

 tubes of the seasonal nerves have at their extremity an elongated cell, 

 analogous to that from which they started. An idea has been given of 

 this arrangement in describing the olfactive portion of the pituitary mucous 

 membrane. 



The other sensitive nerves have been supposed to terminate by peripheral 

 loops, and again by freo extremities passing into kind of cell elements. It 

 i- certain that these two modes exist simultaneously ; recurrent sensibility, 

 which Claude liernard demonstrated in some cranial nerves, prove-- 

 that certain nerves terminate by loops. Our own experiments have 

 shown : 1 , That this recurrent sensibility is a general phenomenon belonging 

 to the .-> nsiticc nerves of the limbs, and even to all the sensitive ramifications 

 of the spinal nerves ; 2, That the recurrent anastomotic loops are formed at 

 different parts along the course of the nerves, either beneath the integument 

 or in its texture. It is, then, proved that the peripheral loops constitute a 

 mode of termination of the sensitive nerves. But this is not tho only mode 

 of termination observed. In the papillie of the skin, in certain regions 

 hand, foot, lips, tongue, glands, clitoris the corpuscles of Meissner, 'or tactile 

 corpuscles, are found ; these are composed of condensed connective tissue, 

 and ore conical, like a pine-cone, the summit towards the periphery. By their 

 base enters one or more nerve-tubes, that ascend toward the apex in 

 a spiral manner. In the conjunctiva, lips, etc., are also found rounded bodies 

 analogous in their structure to the tact corpuscles, and which arc named the 

 "f Km nst: Lastly, on the course of the collateral nerves of the 

 fingers and in the mesentery of the C.it, are the Pad n inn corpnm-les : small 

 globular or ovoid bodies formed of several concentric layers of connective 

 tissue, and with a central canal into which penetrates and terminates, by one 

 or more enlargements, a filament from the nerve-trunk (reduced to the axis- 

 cylinder only). 1 



CHAPTER I. 



THE CHAMAI. <)U F.Ni Kl'HALIC NKKY1X 



Tin. <////',// nerves leave tho cncephalou in pairs, regularly disposed to 

 the right and left, and designated by the numerical epithets of first, second. 

 etc., counting from before backwards. 



Willis, taking for a basis tho number of cranial openings through which 

 the nerves passed, divided them into nine pairs, with which he de.-eiibed 

 the first spinal pair, making it the tenth in the olialie n. : 



division being faulty in some respects, it \\us sought to p. r feet it. 



Hall r commenced by removing the first spinal or suhuecipital pair of 



s to their proper region ; then folio wid So-mmcring and Vicq-d'A/yr, 



1 A ...-rriies sur la BemtUlitl dei TdgUMDl \Vrfn 



.! hi Main.' (Ar.-i.iv- <! rii\>i..|..-i,-. l*r,!>.) 



