STUDIES ON THE DEVELOPMENT OF THE HUMAN 



LARYNX 



H. LISSER 



From the Anatomical Laboratory of the Johns Hopkins University 



THIRTY-NINE FIGURES 



ON THE DEVELOPMENT OF THE HUMAN LARYNX 



The investigation of the embryonic larynx has been by no means 

 neglected. It has received the attention of many investigators 

 resulting in several valuable contributions. Either by reason of 

 limited material or of especial interest in particular features, these 

 researches have usually been directed into the consideration of 

 only parts of this complex field. There is still lacking a well 

 rounded comprehensive review of the whole subject. Nor does 

 this paper propose to accomplish this. The scope has been lim- 

 ited to a study of the cartilages, muscles, and nerves, during that 

 period of embryonic life, when the most active development occurs. 

 This comprises those stages where these respective elements are 

 first definitely recognizable, to where they assume more or less, 

 their adult relationship, namely, from the 10.5 mm. (5 weeks?) 

 human embryo to the 20 mm. (7^ weeks?) human embryo. Inves- 

 tigations on earlier stages although perhaps somewhat proble- 

 matic in results have been made, and excellent accounts of still 

 later development can be found in the literature. 



. METHODS AND MATERL\LS 



The material at my disposal was Dr. Mall's collection of human 

 embryos, for the use of which I am sincerely grateful. Likewise 

 at this time, I desire to express my appreciation of the interest and 

 advice of Dr. Warren H. Lewis, under whose direction these stud- 



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