SALIVARY GLANDS. PANCREAS. 77 



Sub-maxillary Gland. Man. (Muco-serous.) (p.3,s.21,c.P.,m.B.) 

 (L) The mucous acini appear like perforations amongst the 

 more solid serous ones. In many lobules the larger ducts 

 (columnar epith.) are surrounded by dense fibrous tissue, in 

 which blood-vessels and nerves are also placed. (H) Observe 

 the character of the epithelium in the two varieties of acini. 

 In the serous, the nuclei are round and are placed near the 

 middle of the cell. 



Salivary gland injected. Kitten. (Blue gelatin mass, 

 p. 2 (d), s. 17, c. P., m. B.) (L) There is a rich distribution of 

 capillaries in the lobules and in the walls of the large ducts. 

 Note also masses of fat injected. (//) The capillary networks 

 lie close upon the surface of the acini and around the fat cells. 

 Paccinian corpuscles occur in the gland substance in this 

 animal. Observe that capillaries penetrate to the interior of 

 the corpuscle and follow the nerve to its termination. 



Pancreas. Rat. (p. 4, s. 22 & 24, c. P., m. B.) (L) The 21 



lobules are frequently fusiform from mutual compression and 

 the connective tissue between is scanty. Ducts have thin 

 walls and are not prominent. (H) Acini are rather narrow, 

 the epithelium is dense looking, and the cytoplasm is divided 

 into an outer hjematoxylin coloured layer and an inner eosin 

 stained granular portion. These granules are characteristic 

 (Zymogeii). Find the interalveolar cell islets, irregularly shaped 

 clusters of polygonal cells devoid of eosin stained granules. 

 They occur in the substance, most commonly, or in the neigh- 

 bourhood of the ducts. Their general appearance in stained 

 sections is paler than that of the surrounding tissue, they can 

 therefore be recognised under a low power. The interlobular 

 blood-vessels are accompanied by ganglionated nerves. 



