THE DUCTLESS GLANDS 291 



the M. rectus cervicis profundus, in the angle formed by these 

 two muscles, at the level of the truncus arteriosus. It presents, when 

 stained with iron-haematoxylin, a very similar appearance to the thy- 

 roid gland, but consists of only about two or three small follicles. 

 From the study of this body in a large series of Urodeles, Wilder 

 (1929) came to the conclusion that, owing to its extreme variability, 

 it could have little or no physiological importance. 



5. Other Glands. 



Adrenal bodies are present and may be seen as a series of orange 

 patches along the ventro-mesial borders of the kidneys. They are 

 also to be found anterior to these organs, even as far forwards as the 

 subclavian artery, and they are then associated with the sympathetic 

 ganglia (see also pp. 179, 182, and 278). 



The -pineal organ and -pituitary body are described in the section 

 dealing with the brain (pp. 129 and 130). The spleen^ although a 

 ductless gland, is described on p. 267, together with the alimen- 

 tary canal. 'X\\q pancreas^ liver, and gonads \\2iVC2i\so endocrine func- 

 tions although they can hardly be considered as 'ductless glands'. 



BIBLIOGRAPHY OF SECTION X 

 70, 273, 274, 285, 286, 375, 419, 420, 452, 453, 527, 612, 742, 800. 



