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SUPRARENAL BODIES. 



These bodies, which owe their name to the position which they 

 occupy in Mammals in front of the kidneys, orginate from the 

 mesoblastic tissue lying between the mesonephros and the aorta as 

 well as from the sympathetic. 



In Elasmobranchs they are represented by a double row of 

 bodies lying right and left of the vertebral column (that is, arranged 

 segmentally) ; in these, a mesoblastic portion, consisting of richly 

 nucleated lobules, and a part arising from the sympathetic may be 

 recognised. In Teleostei the suprarenals are often wanting, but 

 when present they sometimes represent the metamorphosed anterior 

 (lymphoid) part of the kidney. In other cases, they are closely 

 united with the kidneys. It is probable that in all Vertebrates 

 they arise in connection with the pro- or meso-nephros. In 

 Amphibia, they either lie on the ventral side (Anura) or on the 

 inner border (Urodela) of the kidneys, receiving their blood-supply 

 both in Amphibians and Reptiles from the renal-portal vein. 

 In the latter group, as well as in Birds, they are of a bright yellow 

 colour, of an elongated or lobulated form, and lie in close contact 

 with the genital glands. 



In Arnniota, and especially in Mammals, the suprarenal of 

 each side forms a definite and uniform mass, lying close to the 

 corresponding kidney, and in it an ectoderm al (i.e. sympathetic) 

 medullary, and a mesodermal cortical substance can always be 

 recognised, the two elements here being closely united together. 



M 



