THE DEVELOPMENT OF THE INDIVIDUAL 



535 



In rare instances embryological abnormalities occur in the develop- 

 ment of the external genitalia which result in intermediate conditions. 

 The testes may not descend into the scrotal folds, the lips of the uro- 

 genital orifice may not fuse, and the genital tubercle may remain small. 

 Such a child may be a male, but even a good physician may mistake the 



Photo by C. F. Reather, Carnegie Inst, of Washington, Dcpt. of Interior 



Fig. 33.8. A human embryo 42 days of age with its connecting membranes. Note the 

 placenta which has been cut open to expose the embryo, the amnion containing the 

 amniotic fluid in which the embryo floats, the umbilical cord which attaches the embryo 

 to the placenta, and the rudimentary yolk sac. Compare with the 32-day embryo 



shown in Fig. 21.1. 



sex. The opposite condition occurs when a female has a greatly en- 

 larged clitoris accompanied by a closure of the labial folds which form 

 what can be mistaken for a scrotum. Internally there will probably be a 

 well developed vagina and uterus. Surgery can usually restore the proper 

 sexual characteristics and heavy doses of the correct sex hormone will 



