756 VII. LIPID DISTRIBUTION IN SPECIFIC TISSUES 



Table 13 



Comparative Amounts of Lipids in the Whole Brain of the Guinea Pig, 

 Cat, and Rabbit (Expressed in per Cent of Fresh Tissue)" 



Guinea 

 Substance analyzed pig Cat Rabbit 



Cerebroside 2.29 1.88 2.74 



Cholesterol 



Total 1.76 1.94 2.21 



Free 1.61 1 89 2.16 



Ester 0.15 0.05 0.05 



Phospholipids 



Total 4.82 4.57 5.40 



Monoamine- 3.79 3.69 4.32 



Lecithin 1.18 1.39 



Sphingomyelin 0.94 0.93 1.08 



° A. C. Johnson, A. R. McNabb, and R. J. Rossiter, Biochem. J., 43, 573-577 (1948). 



Table 14 



Comparison of Lipid Composition of the Gray and White Matter 



of the Brain of the Beaver, Cat, Dog, and Man 



(Expressed in per Cent of Fresh Tissue)" 



Gray matter White matter 



Substance analyzed Beaver Cat Dog Man Beaver Cat Dog Man 



Cerebroside 0.68 1.86 1.54 1.20 4.85 5.37 7.43 4 61 



Cholesterol 



Total 1.18 1.20 1.30 1.00 4.16 4.64 4.86 4.00 



Free 1.16 1.19 1.29 1.00 4.16 4.64 4.86 3.69 



Ester 0.02 0.01 0.01 0.00 0.00 0.00 0.00 0.31 



Phospholipid 



Total 3.70 4 03 4.03 3.12 7.22 7.73 7.99 6.24 



Monoamino- 2.90 3 29 3 28 2.82 4.54 3.95 4.95 3 64 



Lecithin 0.69 1.35 1.23 0.61 1.13 136 1.62 0.90 



Sphingomyelin 0.80 0.74 0.91 0.30 2.68 3.78 3.04 2.60 



Total essential lipids 5.56 7.09 7.09 5.32 16.23 17.74 20.27 14.85 



" A. C. Johnson, A. R. McNabb, and R. J. Rossiter, Biochem. J., 43, 573-577 (1948). 



in the brain of the rabbit after the injection of cholesterol, or following 

 inanition. The average cholesterol level in rabbit brain was given as 2.32% 

 based upon the fresh tissue; this is in harmony with the mean value re- 

 cently cited by Johnson et aZ. 298 for this species. 



Kaucher and her collaborators 198 reported the following values (ex- 

 pressed on a dry basis) for the composition of lipids from beef brain: 

 fat, 2.97%; cerebroside, 12.01%; total cholesterol, 10.25%; cholesterol 

 esters, 0.25%; free cholesterol, 10.00%; total phospholipid, 26.37%; 



