486 ESSAYS and OBSERVATIONS 



and which, in the foregoing paper, are 

 mentioned under the name of finufes; The 

 revil ftruiflure and iituation of which, be- 

 ing little underftood, chough often talked 

 of, I (hall relate all that I obferved in this 

 fubjedl ; and then, by comparing it with 

 the common defcription, we may better 

 underftand what has mifled moft anato^ 

 mifts. 



The finufes are feen without any pre- 

 vious diffection upon the inner fide of the 

 uterus, chiefly where the placenta has 

 been fixed ; for there are but few of them, 

 and thefe very fmall, in any other part 



pf it. Their fides are membranous, 



that, next to the cavity of the womb, be 

 ing in each very thin, with a large orifice 



i;^ it. They can be readily diftended, 



by blowing air, or injeding a liquor into 

 the veins ; or they may be filled from the 

 arteries, though with much greater diffi" 

 culty, as happened in our injection: 

 When ftretched, they appear of a fpheroi- 

 dal fhape; and, the diameter of their 

 orifices being lefs than that of their cavi- 

 ties, we may give them the name of finu- 

 fes. 



