I 



FIGURE 3 



Ventral view of chondrocranium of a 20 mm. human embryo. 



Processus costalis et transversus, 



occipital vertebra 

 Foramen jugulare 

 Prominentia foraminalis anterior 



(condylus) 

 Intercondyloid notch 

 Hyale 



Processus longus incudis 

 Incus 

 Malleus 

 Maxilla 



Pharyngeal tubercle 

 Thin area in basal plate 

 Promontorium 



Rib element, 2nd occipital vertebra 

 Chorda dorsalis 

 Hypophyseal stalk 



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