PRINCIPAL REGIONS OF SPINAL CORD 



91 



means that the average size of the ventro-lateral funiculus for 

 the three regions is 2.10 times the size of the dorsal funiculus 

 for the three regions. The fox with the* highest average ratio, 

 5.73, shows therefore relatively the smallest dorsal funiculus of 

 the series. 



While the human cord does not show the largest relative size 

 of the dorsal funiculus in either the cervical or the lumbar region, 

 being surpassed in the former by the raccoon and rhesus monkey, 

 in the latter by mouse and rhesus monkey, yet the average of 

 the three regions places man first. In other words, all the other 



TABLE 8 a 



Ratios of dorsal funiculus to ventro-lateral funiculus. Table 8a has been computed 

 from data in table 6, by dividing the figures in column 4 by those in column 3, table 



■ 6. In other words, the dorsal funicuhis is to the ventro-lateral funiculus as 1 is 

 to the figures in columns 1 , 2 and S below. Column 4 records the average ratios of 

 1, 2 and 3. The animals are arranged according to body weight. 



ANIMAL 



Elephant 



Horse 



Ox 



Bear 



Hog 



Man 



Sheep 



Kangaroo 



Ape 



Dog 



Fox 



Lynx 



Raccoon 



Rhesus monkey 



Opossum 



Cat 



Spider monkey. 

 Java monkey. . . 



Rabbit 



Agouti 



Guinea-pig 



Rat 



Mouse 



Bat 



CERVICAL 

 1 



2.55 

 3.61 

 3.50 

 3.35 

 4.72 

 2.19 

 4.27 

 3.71 

 2.56 

 3.24 

 4.33 

 3.15 

 2. .13 

 2.18 

 2.52 

 3.34 

 2.32 

 2 88 



30 

 99 

 59 

 05 

 34 

 43 



THORACIC 

 2 



4.07 



6.73 

 6.90 

 4.16 

 5.55 

 2.26 

 9.04 

 7.72 

 3.70 

 6.41 

 8.42 

 6.71 

 3.17 

 7.03 

 4.91 

 3.45 

 2.75 

 6.75 

 6.10 

 4.35 

 3.58 

 3.17 

 3.03 

 2.27 



LUMBAR 

 3 



2.31 



3.22 



18 

 62 

 86 

 51 

 04 

 2.38 

 3.24 

 4.44 

 2.51 



92 

 75 

 12 

 60 

 12 

 94 

 3.98 

 2.84 

 3.58 

 2.90 

 1.67 

 1.91 



AVERAGE RATIO 

 4 



2.96 



4.54 



3.23 



4.29 



2.10 



5.60 



4.82 



2.88 



4.29 



5.73. 



4.12 



2.74 



3.65 



3.85 



3.13 



2.39 



4.52 



4.79 



3.39 



3.58 



3.04 



2.34 



2.20 



THE AMERICAN JOURNAL OF ANATOMY, VOL. 14. NO. 1 



