I '^'^^ ) 



The M'lilr.il |>;ii-l nl' ilic (•(MiIi-;i1 ai-ca Ino possesses ils niaxiiiiuiii. 

 siill lo l)c (Iciiioiisiraicd in caso. where llic iiiaxiiinmi (»l' llie lateral 

 central area {sec Wii. •)) lias alrcadv (IcseeiHlcfl iindci- the tliroliold 

 of seiisiliililv. and i> llierc^tore losl. 



It is of a somcw lial rliomlioidal form (see W'j:. I c). 



Ill I'esuiniiiLi' llie total of oin- ohser\alions, \\c ohtaiii for the 

 li-nnkdf'rinaloinata the following- results: 



l*f . 'I'lie ceiiti-al area i> composed of three parts of distinct sig-iiili- 

 cance. their individual dillcrence >lio\\ inu' itself alrcad\ in the manner 

 in which thev oxcrlap one another. ) 



2'"^ 'rhe\ nia\ he demonstrated independeiitlv of one another. 



;V''. Kach of them sidl'er> in a dilferent w av tlKM'educiiiL:- intluence 

 of the operati\-e trauma. 



4t'' . Kach of them indi\ idnallv possesses a maxinHim. centre or 

 ultininm moriens : in thi-^ manner that the iiltinnim moriens of the 

 dorsal piece must i)e understood at the same time to l»e that of 

 the whole dermaloma. 



5^'' . Kach of them corresponds to the (v\tension-area of a dillerent 

 branch of the intercostal nerxc. 



Starlinu- from these facts, an eiideaxoui' mav lie made to ivxplain 

 the siuLiular reduction of the seiisihle ai'ea. hecause of which it 

 heccnnes oid\ pos'-ilile to demon>trate that pai't of the (h'i'matoma 

 we ha\-e calle(l it> central area. Though its cause certainlv ouulit to 

 he souLiht in the operatixc trauma, vet this accounts in no w isi' for 

 the diirerent mannei-. in which the reduction mav he ohserxed in 

 Ihe doi-sal. lateral and xcntral part> of this cenli-al area. 



The pointed narrow in-- of the cental area towards the \en1ral 

 side, hilhei-lo has heen accounteil for hv the jzreater stretching of 

 the \-eiitral paiM of the tiaiid^skiu as compared \\itli its dorsal j)arl. 

 It wa> supposed that an oi'iLiiiiallv (Mpial nund)er of ner\ c-arhorisa- 

 tions existed on the (htrsal as on the \-entral side. This number 

 hein«>- extended over a lariicr surface - as i- the case for ihe 

 \enlral side — the i-esult w ill he a hi.Lihei- threshold of .sensihililv 

 on this side. In our nomenclature this was called : eidaruin.u- of the 

 mariiinal area at the expense of the central area. 



Partlv too. the |)er]uips still larger extension, caused hy the 

 urowlli of the extremities, may he called in aid to explain the tact, 

 that the lateral piece is at once the hroadest as \vell as the feehlest 

 part of the dermat(mia. Uut yet thert> must needs he found another 

 coUaboratini'' factor, if we intend clearing- the ai)i»areii1 contradic- 



1) See: Proc. of llie Royal Acad. Fobr. l^'l' 1002. 



