90 



SPECIAL HISTOLOGY. 



Fig. 205. 



structure with the solitary follicles of the small intestine, and 

 therefore need not be further described in this place. 1 



The blood-vessels of the gastric mucous membrane are very 

 numerous, and their distribution is quite characteristic (com- 

 pare fig. 205, representing the vessels of the large intestine, 

 whose arrangement is almost the same). 

 The arteries begin to divide in the sub- 

 mucous connective tissue, in such a man- 

 ner, that only their finer branches reach 

 the mucous membrane, in which, gradually 

 breaking up into capillaries, they ascend 

 in great numbers, perpendicularly, be- 

 tween the glands and form a network of 

 fine capillaries of 0*002 — 0*003'", around 

 the tubes, which extends as far as to 

 the apertures of the glands. Here 

 this network, which we may regard as 

 continuous through the whole stomach, 

 passes into a superficial reticulation of 

 somewhat larger capillaries, of 0*004 

 — 0008'", whose meshes, in man, are 

 -0*04"' in diameter and encircle the 



polygonal, 0*02- 



Fig. 205. Vessels of the large intestine of a Dog, the mucous membrane being cut 

 through perpendicularly: a, artery; b, capillary network of the surface, with glandu- 

 lar apertures ; e, vein ; d, capillary network round the glandular tubules in the thick- 

 ness of the mucous membrane. 



1 [" Although it may be that the lenticular glands of the stomach are always present 

 in children, they are certainly inconstant in adults, since in many cases no trace 

 whatever can be discovered of them. In other instances they are exceedingly 

 numerous, covering the whole surface of the stomach, but in this case, the invariably 

 diseased state of the alimentary tract, suggests the idea, that they stand in some con- 

 nexion with it. In many mammalia, no trace of such structure is to he found, while, 

 according to BischofF (Mull. Arch. 1838,) they occasionally exist in the dog, in- 

 variably in the pig, and so far as the latter animal is concerned, I can, with Wasmann, 

 confirm this statement. They are here, as Bischoff supposes and as is evident from 

 Wasmann's description, not isolated, but aggregated glands, true minute Peyer's 

 glands. The aggregations measure 1 — 2^"', are distributed especially upon the 

 cardia and small curvature, and are readily seen upon stripping off the muscular and 

 sub-mucous tissue. At first sight, they appear to lie entirely in the last-named layer, 

 but if the attempt be made to detach them, it is found that this cannot be done with- 

 out tearing the mucous membrane, to which they closely adhere. On the internal 

 surface, small depressions are seen where these patches occur, and the gastric glands 

 are here either absent or undeveloped." Kolliker, Mikr. Anat. II, 2, p. 151. — Eds.] 



