602 



NEEVOUS SYSTEM. 



this work, as there are many anatomical parts, the exact physiological rela- 

 tions of which are not understood ; still, there are certain parts which will 

 be referred to by name, a general knowledge of the arrangement of which 

 is necessary. The general relations of these parts are shown in Fig. 219, 

 slightly reduced and modified, from Harrison Allen, which represents a ver- 

 tical longitudinal section of the brain, in the median line. 



As bearing upon certain points in the physiology of the brain, it is im- 

 portant to note the weight of the entire encephalon and of its great divisions. 



FISSURE OFROLANDC 



CALLOSO-MARGINAL SULCUS 



SE PTU M 

 LUC 



ANTERIOR CRUS 

 OF FORNIX 

 I 



TRANSVERSE 

 FISSURE 



VALVE 

 OF VIEUSS ENS 



PINEAL GLAND. 

 CORPORA OUADRIGEMINA 1 



"?io. 219. View of the structures displayed upon the right side of a median longitudinal section of the 



brain semi-diagrammatic. 



Weights of the Encephalon and of Certain of its Parts. Most of the 

 tables of weights of the healthy adult brain of the Caucasian, given by differ- 

 ent observers, give essentially the same figures, the differences amounting 

 to only one or two ounces (28-3 or 56-7 grammes) for the entire encepha- 

 lon. The average weight given by Quain, combining the tables of Sims, 

 Clendinning, and Reid, is 49 ounces (1,408-3 grammes) for the male, and 44 

 ounces (1,247*4 grammes) for the female. The number of male brains 

 weighed was 278, and of female brains, 191. In males the minimum weight 

 was 34 ounces (963-9 grammes), and the maximum, 65 ounces (1,842'7 

 grammes). In 170 cases out of the 278, the weights ranged between 46 and 

 53 ounces (1,304-1 and 1,502-5 grammes), which may be taken as the average 

 limits. In females the minimum was 31 ounces (878-8 grammes), and 

 the maximum, 56 ounces (1,587*6 grammes). In 125 cases out of the 191, 

 the weights ranged between 41 and 47 ounces (1,162*3 and 1,332-4 grammes). 



Quain assumed, from various researches, that in new-born infants, the 



