pituitary gland 



pineal body 







thymus, adult condition 

 thymus at 12 years 



parathyroids 



adrenals 



ovary 



testis 



Fig. 8.1. The principal endocrine glands. Note that both male and female gonads and both 

 juvenile (twelve year) and adult thymus are included in the same manikin. The inset shows 

 the glottis and edges of the thyroid from the back, with the right parathyroids indicated by 

 the small arrows. 



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