490 FREDERIC T. LEWIS 



Antrum cardiacum (Luschka, 1863) 

 Gaster 



Cardia 



Pars cardiaca gastri (Home 1814) 

 Fundus (Meckel 1820) 

 Corpus (Rudinger 1873) 

 Canalis gastricus 

 Pars pylorica gastii (Home 1814) 



Vestibulum pyloricum (Jonnesco 1895) 

 Antrum pyloricum (Willis 1674 (?); Cowper 1698) 

 Pylorus 

 Antrum duodenale (Retzius, 1857) 

 As boundaries between these parts, the following may be 

 recognized : Between the cardiac antrum and fundus, the ' inci- 

 sura cardiaca;' between cardiac and pyloric parts, the 'incisura 

 angularis;' between pyloric antrum and pyloric vestibule, the 

 'sulcus intermedius' (all of His 1903); at the pylorus, the 'sulcus 

 pyloricus' (Luschka 1863). 



THE STOMACH IN HUMAN EMBRYOS 



The embryonic stomachs to be examined are five in number, 

 from embryos between 10 mm. and 45 mm. in length. Thus 

 they are all smaller than the specimens studied by Miiller, but 

 similar stages have been described by Broman in his extensive 

 work on the omental bursa. Broman modelled not only the 

 gastric epithelium, but also entire stomachs, including the meso- 

 dermal portion. In the models to be described, only the epithe- 

 lium has been included, since this is the portion having character- 

 istic shape, to which the other layers subsequently conform. 



In the youngest embryo (10 mm., fig. 5) the stomach is no 

 longer a simple sac with superior and inferior orifices, but is 

 already divided into an expanded pars cardiaca and a tubular 

 pars pylorica. Between the two, and almost exactly in the middle 

 of the stomach, is the incisura angularis. Since the incisure in the 

 adult is perhaps twice as far from the cardia as from the pylorus, 

 it is evident that the pars pylorica is relatively long in early stages. 

 This is strikingly shown in other models of the series (figs. 6-9). 



