APPENDAGES OF THE FCETUS. 



79 



inner face is everywhere in contact with the allantois, though it does 

 not adhere closely to it. 



Amnion. 



The amnion is the second complete sac enveloping the fcutus. It 

 lloats freely in the chorial sac, to which it is only attached at a single 



Tig. r.'. 



FcKTl'S OK MaUK AM) ITS ExVKLOPES. 



A, Chorial Sac ; C, Amnii)tic Sac withdrawn from the Allantoid Cavity, and 

 opened to expose the Fiutus ; 1), Infundilxiliun of the I'rachns ; V>, Allantoid 

 portion of the I'nibilical Cord : h, Portion of the Kxtcrnal Surface of the 

 Chorion destitute of Placental Villosities, and correnponding to the j)oint of 

 insertion of three pediculated llippomanes. 



point, through the medium of the umbilical cord ; and it contains the 

 ftctus, which is fixed to its inner face by the same means. It is formed 

 by the external layer of the blastoderm. It envelops the embryo very 

 closely at an early period, and is continuous with the common integu- 

 ment of the foetus at the open abdominal parietes. At a later period it 



