384 HOWARD AYERS 
through the connective-tissue root sheath on the ventromesial 
face of the larger maxiliomandibular nerve trunk, it has been 
described as a branch of the latter. 
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Fig. 33 Ventral view of the left trigeminus of Bdellostoma, showing some of 
the anastomoses of the root bundles and the manner of origin of the maxillaris 
and mandibularis. 
Most of the root bundles of the nasalis nerve arise (figs. 31 
and 32) from the mesial part of the tip of the fork of the medulla, 
cross ventrad of the root bundles of the ophthalmic and turn 
sharply to enter the base of the nasalis root. Other bundles 
