176 



ANIMAL PHYSIOLOGY. 



[LESSON 49. 



FIG. 281. 



appearance to the intestines), of unusual size, and remarkable for the 

 squareness of their contour (Fig. 280) ; it will be seen, by reference 



to the figure, that the villi are in- 

 tensely vascular. To this succeeds 

 the small intestine (i, i), the coacum 

 (&), and the large intestine (m), 

 terminating in the cloaca (o). 



In the common Crow, the ali- 

 mentary canal possesses much gen- 

 eral agreement with the like organs 

 in the Fowl ; points of difference, 

 however, occur. 



A portion of the oesophagus (a, 

 Fig. 281), together with the giz- 

 zard and commencement of the 

 duodenum, has been accurately 

 copied from a dissection. It will 

 be apparent that the enlargement 

 at the cardiac portion of the osso- 

 phagus (b) exceeds that of the 

 Fowl. 



The pylorus (d) marks the 

 Gizzard, duodenum, &c., Crow. point where the duodenum (c) 



commences. The gizzard (e), although not very large, possesses 



muscles of great power. 

 These will be better under- 

 stood by consulting Fig. 

 282, in which this organ is 

 seen cut open. The lower 

 part of the oesophagus (a) 

 conducts to the cardiac en- 

 largement (b). A muscle 

 of the larger pair is cut 

 through at c, and a muscle 

 of the smaller pair at d. 

 The deep folds and wrinkles 

 of the interior of the sto- 

 mach (gizzard) are referred 



Gizzard laid open, Crow. 



to at e. 



The intestines exceed in length those of the Fowl, and terminate 

 without the development of a coscal appendage. 



FIG. 282. 



