THE ANATOMY OF A 17.8 MM. HUMAN EMBRYO' 



F. W. THYNG 



/''/■(;/// the Depurlmenl of Comparative Anatomy of Harvard Medical School 



EIGHT FIGURES 



CONTENTS 



Introduction 33 



External features 33 



Digestive system 35 



Oral cavity 35 



Pharynx 36 



Salivary glands 40 



Oesophagus 40 



Stomach 41 



Intestine 42 



Liver : 43 



Pancreas 44 



Respiratory system 45 



Larynx 45 



Trachea 45 



Lungs 45 



Pleural cavity 45 



Urogenital system 46 



Wolffian ridge and body 46 



Wolffian duct 46 



Miillerian duct 47 



Bladder 47 



Urogenital sinus 47 



Metanephros 48 



Genital ridges 48 



Ductless glands 48 



Suprarenal gland 48 



Spleen 50 



Nervous system 50 



Brain 50 



Telencephalon 50 



Diencephalon 51 



Mesencephalon 51 



Isthmus 52 



Metencephalon 52 



Myelencephalon 53 



1 This work has been aided by a grant from the Elizabeth Thompson Science 

 Fund. 



31 



