author's abstract of this paper issued 

 BV THE bibliographic SERVICE, JULY 7 



/ 



THE HISTOLOGY OF THE UMBILICAL CORD OF THE 

 PIG, WITH SPECIAL REFERENCE TO THE VASCULO- 

 GENIC AND HEMOPOIETIC ACTIVITY OF ITS EXTEN- 

 SIVELY VASCULARIZED CONNECTIVE TISSUE 



H. E. JORDAN 



Department of Anatomy, University of Virginia 



FIFTEEN FIGURES 



The umbilical cord of the pig differs markedly from the human 

 cord in that it is extensively vascularized, its connective tissue 

 maintains throughout the gestation period largely its original 

 embryonal character, and vasculogenic and hemopoietic activity 

 persist to full term. 



The material upon which this investigation is chiefly based is 

 a complete cord, 4 cm. in length, from a fetus of 16-cm. length. 

 This fetus was secured in utero at the abattoir and preserved in 

 10 per cent formalin. Reckoned by length, it lacked between 

 one and two weeks of full term. Portions of the cord from the 

 proximal end, the middle, and the distal end, were imbedded 

 both in celloidin and in paraffin. Serial sections were cut from 

 the paraffin blocks and stained with hematoxylin and eosin. 

 Some of the celloidinsections were similarly stained ; others were 

 stained with resorcin-fuchsin and counterstained with picric- 

 acid-fuchsin, for a study of the elastic and collagen fiber content. 

 A second specimen of a nearly full-term cord, for which I am 

 indebted to Prof. George S. Huntington, was used for comparison. 

 Cords of pig embryos from 9 to 21-mm. length and five full-term 

 and three fetal (three to seven months) human cords, variously 

 fixed and stained, were also employed for comparative study. 



Though primary interest centers upon the vasculogenic and 

 hemopoietic activity of the connective tissue, it seems desirable 

 to preface the description and discussion of these phenomena 



