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STRUCTURE OF THE VERTEBRATES 



The female is less differentiated from the embryonic condition. 

 The tubercle remains as the small ventral clitoris; the primary 

 genital fold forms the outer labia (labia majora) ; and the inner 

 folds develop into the inner labia (labia minora). The vaginal 

 and urethral openings are enclosed by the paired labia. 



These changes occur at an early stage in embryonic life, 

 and further differentiation is a matter of slow growth until the 

 time of puberty. At birth the sexes are practically identical in 

 body form, but at the end of one or two years the child begins 

 to assume the pectoral and pelvic shape characteristic of the sex. 



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