TYPICAL STRUCTURE OF ORGANS 



29 



organ in the human body (see Fig. 2). The pancreas, or 

 " sweetbread," of the calf is an excellent gland for the 

 beginner to dissect or study. 



2. A typical gland. If we have before us the whole or a 

 part of any typical gland, we find that we are dealing with 

 a comparatively soft and sometimes even pulpy mass held 

 together by a loose mesh or network of harder, tougher, and 

 more or less fibrous materials. 



A pancreas or a liver, if en- 

 tire, shows conspicuous lobes, 

 and in the pancreas these 

 lobes are plainly subdivided 

 into smaller lobes, or lobules. 

 In favorable specimens tubes 

 may be seen connected with 

 the gland ; some of these are 

 blood vessels supplying blood 

 to the gland, and one of them 

 is a duct draining away from 

 it the liquid which the gland 

 has manufactured or secreted. 

 After a preliminary examina- 

 tion of this sort of some edible 

 gland, preferably the pancreas, 

 we may pass on to consider in greater detail one of our own 

 salivary glands, of which we have two on each side of the 

 head, namely, one parotid and one submaxillary gland. 



3. The structure of the submaxillary gland. The two sub- 

 maxillary glands lie, one on each side of the face, embedded 

 in the tissues between the lower jaw and the upper portion 

 of the neck. From each gland a duct passes forward in the 

 tissues forming the floor of the mouth, into which it opens 

 by one of the small eminences, or papillce, under the tongue. 

 Through this duct the gland pours into the mouth its 

 secretion, saliva. 



FIG. 19. Diagram of submaxillary 

 gland 



D, its duct ; N, its nerve ; A, its artery ; 

 V, its vein ; T, tongue 



