author's abstract of this paper issued 

 bt the bibliographic service october 20. 



ANATO^IY OF A SEVEN MONTHS' FOETUS EXHIBFriNG 

 BILATERAL ABSENCE OF THE ULNA ACCOMPANIED 

 BY MONODACTYLY (AND ALSO DIAPHRAGMATIC 

 HERNIA) 



JAMES CRAWFORD WATT 



Department of Anatomy, Universitrj of Toronto 



FOUR TEXT FIGURES AND FOUR PLATES 



CONTENTS 



Introduction 385 



Preservation 386 



Parental history 386 



External appearance 386 



Radiographs 391 



Dissection of left arm ' 395 



Muscles 395 



Nerves 409 



Vessels 411 



Embryological and general considerations 413 



Diaphragmatic hernia 425 



Bibliography 428 



INTRODUCTION 



The foetus forming the subject of description in this paper 

 exhibits the rare deformity of complete absence of the ulna in 

 each arm, accompanied by the still much rarer condition of 

 monodactyly (figs. 1 to 4). This latter condition is not to be 

 confused with the relatively common condition of syndactyly, 

 where more than one digit is present, but they are united by a 

 web of skin and other tissues. Monodactyly, the presence of 

 only one digit, is very uncommon, and in a search through 

 the literature only one case was found that resembles the present 

 one, and that was presented as a freak exhibit at a medical 

 society, no anatomical investigation of it having been made. 



385 



