vi PREGNANCY PARTURITION PUERPERIUM 241 



their full development, owing either to the action of the nervous 

 system or the absorption of chemical stimuli (hormones). 



Pio. 103. Gravid uterus at three months, seen from behind. Drawing one third natural size. 

 From a fresh preparation. (Bumm.) The ovum is planted in the left tubal angle ; the oblique 

 dotted line shows the boundary of the plaeental insertion ; the transverse dotted line indicates 

 the lower pole of the ovum ; the lines starting above show the gradual transformation into 

 a round shape during the following months. 



The changes brought about in the organs surrounding the 

 genital apparatus by the influence of the gravid uterus are of 

 less importance from a physiological point of view. The bladder, 

 the ureters and the abdominal wall feel the mechanical effects of 



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