418 



THE ORGANS 







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nective tissue changes with age, the same reaction of its cells to 

 chrome salts, and the same or a similar secretion. 



The t3mipanic gland and the organ of Zuckerkandl are small col- 

 lections of chromaffin cells, the former lying on Jacobson's nerve in 



the tympanic canal, the latter lying 

 I ^ in the retroperitoneal tissue at about 

 J the level of the bifurcation of the 

 abdominal aorta. 



The Adrenal 



The adrenal is a ductless gland 

 situated on the upper and anterior 

 surface of the kidney. It is sur- 

 rounded by a capsule and consists of 

 an outer zone or cortex and a central 

 portion or medtilla. The cortex and 

 medulla are sharply differentiated 

 both in general appearance and in 

 histological structure. The former 

 is of rather lirm consistency, its cells 

 are arranged in rows wdth the blood- 

 vessels between them, giving the 

 zone a striated appearance. Its cells 

 contain fat droplets and peculiar 

 granules known as lipoid granules 

 which give the cortex a yellowish tint. 

 In contrast the medulla is soft, vas- 

 cular, has a dark reddish appearance, 

 and its cells contain granules known 

 as chromaffin or phceochrome granules. 

 The CAPSULE (Fig. 295, A) is 

 composed of fibrous connective 

 tissue and smooth muscle. In the 

 outer part of the capsule the connec- 

 tive tissue is loosely arranged and 

 merges with the surrounding fatty areolar tissue. The inner layer 

 of the capsule is more dense and forms a firm investment for the 

 underlying glandular tissue. From the capsule trabeculae extend 

 into the organ forming its framework and outlining compartments, 



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of 

 A. 



Fig. 2Q5. — Vertical Section 

 Adrenal. (Merkel-Henle.) 

 Capsule; B, cortex; C, medulla; (7, 

 glomerular zone; b, fascicular zone; c. 

 reticular zone; v, vein in medulla. 



