FCETAL NUTRITION: THE PLACENTA 485 



Tu-paia. — 111 Tiipaia javaniea also tlie placeiitatiiiii is luoditieil l)y 

 the characteristics of the uterine mucosa. Huljiecht ^ has shown that 

 two specialised areas, the " Hafttiecke," exist before the attachment 

 of the trophohlast. Thej' lie one on each side, aljout midway ))etween 





^ 



^ 



^S s> 



J} ® {^ 

 /"< ■ '4-5"'S;'- /C» ^ ® ^ (J 





* a r« * '* - Ik. 



l'"i(j. 144. — Oriiice of a uti^rine gland of the mole with trophoblastie dome. 

 (From Vernhout's " Ueber die Plaeenta des Maiihvuif.s," Anat. Hi'fti; 

 voh v., 1894.J 



III., Uterine mucous membrane ; cc, uterine epithelium ; pL, pla.smodibhist ; 

 (■//., cytoblast ; f/.s., gland .secretion. 



the mesometrial and anti-rnesonietrial i-egions, and ;ire recognised ]>j 

 the absence of glandular ducts. The deepei- parts of the glands 

 j)ei'sist till the end of pregnancy, liut none ojieu ou tlie modified areas. 

 The uterine epithelium again disappears at the points of contact 

 with the lilastocyst o\'er the " Hafttiecke." There the trophohlast 

 liecomes thickened, and its cells enlarge and penetrate lietween the 

 ejiithelial cells, which fuse to form a symiilasma. This is ipuckly 

 absorl)ed by the trophohlast, whicJi continues to thicken, and now 



' Hubrecht, " Ueljei' die Entwicklung dcr Placenta von 7'//'.s'///.< und Tupujii,'' 

 Inter not. (\nitji-. nf ZmJ., Candjridge, 1898. 



