CHARACTERS OF TESTIS. 



479 



there are smaller oval spaces, some of them crossing the deeper and larger. 

 The spaces or loculi (&) are filled by columnar masses of cells, but slight 

 force readily removes these from their containing hollows. 



The central or medullary portion (c) is rather red in color, or it may be 

 dark brown or black from the presence of blood. About half as thick as 

 the cortical part, it possesses internally small round or oval spaces, on a 

 section, which are vein trunks cut across. The areolar tissue of its stroma 

 is very fine, and forms a network with small but regular meshes ; and the 

 medullary is separated generally from the cortical 

 portion by a layer of areolar tissue. Cells fill the 

 meshes. 



Cells. The cells filling the loculi of the stroma 

 in the cortex are nucleated with oil globules and 

 fine granules ; and being packed in masses, they 

 take on a polygonal form : they measure about the 

 TT \^th of an inch. In the medullary portion the 

 cells resemble those of the cortex, except that they 

 do not contain oil particles ; and they are rather 

 larger and more granular, measuring about joVu^ 

 of an inch. 



Bloodvessels. Numerous arteries are furnished 

 to the suprarenal body from the diaphragmatic and 

 renal vessels, and from the aorta. In the interior 

 the arteries ramify in the cortex along the septa 

 between the cell masses ; and frequently anasto- 

 mosing together, end in a fine capillary network, 

 with elongated meshes, around the loculi. In the 

 medullary part the fine arteries are distributed 

 through the stroma. 



The veins originate in capillary plexuses ; and 

 the several radicles, uniting in large branches 

 which pass through the centre of the medullary 

 part, are collected finally into one trunk ; this opens on the right side into 

 the vena cava, and on the left into the renal vein. Other smaller veins 

 pass out through the cortex to the renal vein and the vena cava. 



Nerves. The nerves are very numerous and large, and pass inwards 

 along the septa of the cortical part : branching, they extend between the 

 cortical and medullary parts in the layer of areolar tissue, and in the me- 

 dullary substance they form a network in the areolar structure, but their 

 ending is unknown. 



Lymphatics are superficial and deep, and both join those of the kidney; 

 the arrangement of the deep is undetermined. 



VERTICAL SECTION OF THE 

 SUPRARENAL BODY. 



a. Surface layer of stroma. 



b. Cells in the cortex. 



c. Medullary portion. 



d. Spaces in the medullary 



part (Harley). 



THE TESTES. 



The testes are the glandular organs for the secretion of the semen. 

 Each is suspended in the scrotum by the spermatic cord and its coverings 

 (p. 418), but the left is usually lower than the right; and each is pro- 

 vided with an excretory duct named vas deferens. A serous sac partly 

 surrounds each organ. 



Dissection. For the purpose of examining the serous covering of the 

 testicle (tunica vaginalis), make a small aperture into it at the upper part, 

 and inflate it. The sac and the spermatic cord are then to be cleaned ; 



