PLATE I 



Plate I is from the upper surface of section I which passes 

 through the intervertebral disc (Fibrocartilago interverte- 

 bralis IV) between the fourth and fifth cervical vertebrae 

 posteriorly and through the thyreoid and arytenoid carti- 

 lages anteriorly. The dotted line is the outline of section 

 II which is 1.3 cm. below this plane and shows how rapidly 

 the body expands in this region. 



The plane of the section is not horizontal but is 4.4 cm. 

 lower in front than behind, and is a little lower on the right 

 than on the left side. 



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