AND PHYSIOLOGY, 



171 



until it reaches a point as high as the clavicle, where it 

 gradually curves forward, and joins itself to the left sub- 

 clavian vein. The Lacteals and Thoracic Duct are all made 

 up of three coats and present a silvery white appearance 

 from the color of the fluid they contain. Their function is 

 to convey the Chyle or nutrient portion of the food into the 

 blood. 



309. Kidneys. — The Kidneys are two in number, situated 

 upon the side of the lumbar vertebras, and are generally en- 

 closed in a larg-e amount of fat. Their average size is be- 

 tween four and five inches in length, two and a half inches in 

 breadth, and one in thickness. Their color is of a reddish 

 yellow, and form decidedly oval, with a depression in one of 

 the sides. Upon its upper extremity is a small body, called 

 the Renal Capsule, and the whole organ is abundantly sup- 

 plied with blood. The design of it seems to be the removal 



Fig. 185. Fig. 186. 



A Section of the Eight Kidney surmounted by the Renal Capsule. 1, Supra-Eenal 

 Capsule. 2, Cortical Portion. 3, Medullary or Tubular. 4, Two of the Calices 

 receiving the Apex of their corresponding Cones. 5, The Infundibula. 6, The 

 Pelvis. 7, The Ureter. 



What vein does it empty into? What fluid does it carry? 309. State the leading 

 features of the Kidneys. What is found upon its upper edge ? 



