14 PROFESSOR D. J. CUNNINGHAM 



(previously called by Luschka the ' sulcus prapylorica ') is placed about an inch or an 

 inch and a quarter from the pyloric constriction (PL I. figs. 6, 7, and 8), and to it His 

 has given the name of sulcus intermedins — a term which we may adopt. The short 

 portion of the greater curvature between the sulcus intermedius and the pyloric 

 constriction he designates the camera tertia, and the portion of the lesser curvature 

 from the incisura angularis to the pyloric constriction — comprising, therefore, the entire 

 length of the pyloric part of the lesser curvature — he calls the camera minor. In a 

 considerable number of stomachs, both of man and the chimpanzee, these two latter 

 subdivisions proposed by His are more or less apparent as faint bulgings of the stomach 

 wall (PL I. fig. 8) ; but when the interior of the organ and the structure of its wall are 

 examined, it is seen that the recognition of a camera minor and a camera tertia is 

 unnecessary, and that the terms are inappropriate. There cannot be a doubt that 

 Jonnesco (27) and Muller (40) have attained the proper conception of this portion of 

 the stomach by subdividing it into two parts, to which the former author has applied 

 the terms of pyloric canal and pyloric vestibule. 



Pyloric Canal. 



Although the pyloric canal is by no means constant in form, and undergoes striking 

 changes in accordance with altered physiological conditions of the stomach, there is no 

 part of the organ which is more definite and distinct. It is, as a rule, a short, more 

 or less tubular portion about an inch or so in length (3 cm., Jonnesco), which extends 

 from the sulcus intermedius in the greater curvature to the duodeno-pyloric constriction 

 (PL I. figs. 6, 7, and 8). Its demarcation from the pyloric vestibule is rendered the 

 more evident by the fact that usually, on the other side of the sulcus intermedius, the 

 greater curvature bulges out into a marked expansion (camera princeps of His) ; but on 

 the side of the lesser curvature it is not usual to find in the adult any limiting 

 mark on the exterior separating the pyloric canal from the rest of the stomach. 

 Jonnesco, it is true, describes at this point a sulcus (' le sillon pylorique superieur ') which, 

 he states, indents the lesser curvature between the pyloric canal and the pyloric 

 vestibule. This is a rare occurrence in the adult, although it is not uncommon in the 

 fretus and child. In the latter the appearance is not so much due to a constriction as 

 to a widely expanded pyloric vestibule giving place suddenly to a tightly contracted 

 pyloric canal (see the figures in PL X. accompanying Erik Muller's memoir (40)). In 

 figs. 6, 7, and 8, PL I., the external characters presented by the pyloric canal in the 

 foetus, the chimpanzee, and a child of two years are well seen. 



By making a section through the pyloric part of the stomach in the plane of the 

 two curvatures, the characters presented by its two parts can be more fully appreciated. 

 This has been done in the case of the stomach of the child and of the chimpanzee referred 

 to above, and the appearances presented by each are figured in PL II. figs. 15 and 16. 

 In both, the pyloric canal is contracted along its whole length, and in the case of the 



