HUBRECHT. Pl. DD. 
on 
eS 
: 
Ks 
= 
Sn 
Fig. 141. Longitu- 
dinal section through an 
early human_ blastocyst 
with amnion (am) neu- 
renteric canal, connec- 
tive stalk /es) and al- 
lantoic tube (after Spee). 
Vascularized trophoblas- 
tic wall of blastocyst 
with villi only partially 
represented.  umbili- 
cal vesicle. — Fig. 142. 
Diagrammatic section 
through the blastocyst 
and early placentary 
attachment of a catar- 
rhine monkey (after 
Selenka, ’00). UZ ute- 
rine epithelium, Z« ves- 
sels in maternal tropho- 
spongia, /R lacunae in 
trophoblastic tissue, fil- 
led with maternal blood. 
am . 
