582 
F. H. EDGEWORTH. 
outwards into tlie masticatory Anlage. The ramus posterior 
is formed in a 9 mm. embryo. 
In a 13 mm. rabbit embryo (figs. 65 — 67) the Gasserian 
ganglion is a relatively huge mass above the Anlagen of the 
masticatory muscles. Below the ganglion is the Anlage of 
the ala temporalis; the processus alaris is not yet formed. 
Fig. 67. 
Meckel’s cartilage is a slightly cui-ved rod. The Anlage of 
the mandible^ in which ossification has not yet begun, lies on 
the outside of Meckel’s cartilage ; its anterior edge does not 
extend quite so far forwards as that of the muscle- Anlagen ; 
posteriorly its upper part ends abruptly except below, where 
there is a slight backward process. The auriculo-temporal 
nerve runs outwards and downwards behind the abrupt 
posterior edge and over the slight backward projection of the 
mandible. The Anlage of the masticatory muscles has not 
yet divided into medial and lateral portions, these being 
