140 \Ii:i;lSTIC VARIATION. [PART r. 



;|iat tin- variation of the vertebral regions goes hand 

 in hand \\itli that t>f the plexus, and though a comparison be- 

 t\\.i ii ll'i-i-nherg's al)iionnal Chimpanzee with that dissected by 

 ( 'liampii'-v- lar-i-ly bears out this suggestion, yet it is also clear 

 that tin- e..nv|ation is not a precise one, as indeed has already 

 a | >| I. -a i. -i I in several instances. 



In ;_ r i\iir_r the compositions of the several nerves of the lumbo- 



ial pi. \MS in Man and Chimpanzee, I have given the num- 



} \-^ '!' the nerves in the whole series for simplicity of comparison. 



li will In- remembered that a Chimpanzee has one pair of ribs 



in. MI- than Man. tin- XX 1st nerve is the 1st lumbar in Man, but 



i- i In- loth dursal iii Chimpanzee, the XXVIth nerve being the 



!- sacral in l'"th forms. The table given shews, as Champneys 



hat ti. 'Tal arrangement of the nerves of the lower 



limb and Inmliar and sacral plexuses was in Chimpanzee very 



similar to that in Man, but that the nerves are very differently 



composed. 



MAX. CHIMPAX7I 1 . 



Ilio-hvp_;a-' l ir I y y . VVT 



Ilio-inguinal ............ AAi 



Genito-crural XXL XXII ............. XXI. 



External cutaneous XXII. XXIII ............. XXL, XXII. 



Obturator XXIII. XXIV ............. XXL XXIII. 



Anterior crural XXII. XXIV ............. XXL XXIV 



Superior gluteal XXIV. XXVI ............. XXIV. XXVI. 



- era) plexus XXI V. XXIX ............. XXIL XXVII. 



Small sciatic XXIV. XXIX ............. XXIV. XXVI. 



t l-Y'.m < '11 \Mi'\i:vs. I.e. ].. -2\n.) 



'I'll'' "li-m of tin- nerves is therefore in several cases lower 

 in Man than in the Chimpanzee, although in the absence of ribs 

 "ii 'I"- -<>th vertebra Man shews a character which, as compared 

 with tin- presence of ribs in this position in the Chimpanzee repre- 

 sents a backward 1 1> >mo'o.-.is. 



Man. With the l'..re--oin'4. compare the case mention. -d above 

 (No. -VJi in \\lii.-h two entire Inmliar nerves joined the sacral 

 pl'Aii> in a human subject having no ril.s on the 19th vertebra, 



&c. STRUTHERS, ./. Anat. Phys., is?."), p. 1-1 and p. -i\). 



~-. I''""' int'oniiatinn as bo the \ariatiuns of the luml>o-s;uTal plexus in 



'!'' I'riiiiat.- eeal o 'ROBEKBEKQ, Aforph. Jahrb., I. 1N7'), j>. l7etseqq.; 



ii'i'l :1 ^ '" CftSea in I'riiiiat.-^ and in ntlirr \ crteln-.-ites compare \o\ 

 JHERINO, Das peripherisch Nervenayatem </ ,- II '///,//////, />>, &c., Leipzig, 



111 these, two cases <' jiariial ha.-kwanl Hoinu'osis in the 

 liii.,l...-a,-i-al |.le\ii. , ,\ i|,r | ), , u are perhaps noteworthy, as be i m,' 

 represented .-mil d.-M-ril.ril in greater detail than many of von Jhering's 



I" one of these tin- Hi. ..f the i:iih dorsal ii'iMh vertebra) \\is 

 nut il.-Nrlnp,.,!, this vertebra I.ein- formed as a lumbar and thus itself 

 sh'-w in- a I. . 'i. -k ward ||, ...... ^is ii, currelation to that of the nerves 



