§2.311 



KNDOCRINE CELLS FROM COKLOM 



51 



groups of suprarenal cells which represent the adrenal medulla of 

 higher forms. 



In Teleostei and related bony fish, the homologous tissue is 

 called the anterior interrenal body, to distinguish it from the 

 corpuscles of Stannius, or posterior interrenal bodies. The former 

 resembles the adrenal gland of tetrapods, in containing a mixture 

 of typical cortical and medullary cells. Of these, the cortical cells 



Table 6. Mesodermal sources of metabolic hormones 

 in vertebrata 



M = metabolic. 



respond to stimulation by the adrenocorticotrophic hormone, 

 ACTH, from the pituitary. Like the interrenal cells of the 

 elasmobranchs, this tissue yields an active extract which is inter- 

 changeable with that of any tetrapod adrenal cortex. Injection of 

 any of the extracts can keep alive a mammal or bird from which 

 the cortex has been removed. 



The corpuscles of Stannius are small, paired globules of tissue, 

 embedded in the mesonephric kidneys; there are numerous pairs 



