392 



THE DIGESTIVE APPARATUS IN MAMMALIA. 



Fig. 189. 



terminate in culs-de-sac (or glandular cceca). The epithelium is not the 



same in the two kinds of glands : the mucous glands (Fig. 189, a, b) are lined 

 with cylinder-epithelium throughout their extent ; 

 the peptic glands (Figs. 187,188) are lined with 

 cylinder-epithelium at their origin (Fig. 187, a), 

 but the secretory tubes contain round peptic cells. 

 (Each caeca, when highly magnified, is found to 

 consist of a delicate basement membrane (Fig. 

 188, a) inflected over a series of nearly globular 

 cells (ft), which occupy almost the whole cavity 

 of the tube, and contain a finely-granular matter ; 

 the narrow passage left vacant in the centre is, 

 however, still surrounded by a layer of epithelial 

 cells (c), whose small size is in striking contrast 

 to the large dimensions of the gland cells.) 



The muscular layer (of the mucous membrane) 

 is immediately beneath the glandular structure, 

 and contains two planes of intersecting fibres. 

 Lastly, the connective layer of the corium is thick 

 and loose, sustains the vessels (and nerves), and 

 unites the mucous to the muscular tunic of the 

 stomach. 



4. Vessels and nerves. The stomach receives its 

 . blood by the two branches of the gastric artery, the 

 splenic and its terminal branch the left epiploic 

 artery, and by the pyloric and right epiploic arteries. 

 The principal arterial ramifications extend be- 



MUCOUS GASTRIC GLAND WITH Jween the mucous and muscular layers, where 

 CYLINDER EPITHELIUM. tnev furnish two capillary reticulations to the 



a, Wide trunk ; 6, 6, Its csecal glandular layer : a deep network that surrounds 

 appendage. the secretory tubes, and a superficial placed be- 



tween the alveoli. The blood is carried from the 



organ to the vena portae by the satellite venous branches. The lymphatics 



Fig. 190. 



APPEARANCE OP THE PROPER GASTTRIC MEMBRANE OF THE STOMACH IN AN 

 INJECTED PREPARATION (HUMAN). 



A, From the convex surface of the folds or rugae ; B, From the neighbourhood of 

 the pylorus, where the orifices of the gastric follicles occupy the interspaces of 

 the deepest portions of the vascular network. 



form a subserous and two deep networks at the base of the glandular 

 layer and in the fibrous membrane. They enter small ganglia (or glands) 

 situated along the curvatures, and from these to Pecquet's reservoir. The 



