THE FORM OF THE HUMAN STOMACH 



491 



Incisura cardiaca 



Antrum cardiacum 



Sulcus intermedius 

 Fig. 4 Diagram showing the subdivisions of the human stomach 



It is true also in the cat, if one may judge by comparing Thyng's 

 model of the stomach of a 10.7-mm. embryo (this Journal, 

 vol. 7, p. 496) with Cannon's tracings from the adult. In rumi- 

 nants a constriction early separates the rumen and reticulum from 

 the psalterium and abomasum; according to Ellenberger and 

 Baum the abomasum is larger than the rumen in embryos and 

 very young animals, but later this relation is reversed. The 

 relatively large size of the pars pylorica in early stages is therefore 

 not limited to human embryos. 



The cardia cannot be definitely located in the 10-mm. embryo 

 (fig. 5) since the oesophagus, in joining the stomach, expands into 

 a flattened cone, one margin of which extends to the angular 

 incisure. A similar extension of the oesophageal cone to the 

 incisure is clearly seen in Broman's model of the stomach of the 

 seventh embryo in his series (11.7 mm.). At 16 mm. (fig. 6) 

 the body of the stomach may be recognized along the lesser cur- 

 vature, separating the oesophageal cone from the angular incisure; 

 but a canal, distinctly marked out above and indicated below, 



