as 
=a? oy 
— 
i a 
it 
we 
he 
i 
hs 
ae iW) 
Fig. 5 <A photomicrograph of section 63 from the eight-somite embryo H87. 
x 100. The plane of section passes through the ganglionic anlage on both sides 
and through the rostral end of the otie plate. ac.fac.gang., acousticofacial 
ganglion; a.i.p., anterior intestinal portal; ao., aorta; ot.pl., otic plate; ph., 
pharynx; y.s., yolk sac; VIII sul., ganglionic sulcus. 
Fig. 6 A photomicrograph of section 50 from the eleven-somite embryo 
H392 (Univ. of Chicago Coll.). The plane of section passes in front of the otic 
plate and shows the ganglia separated from the neural folds except at the dorsal 
edges. The tube is closed immediately caudal to this level. end., cardiac 
endothelium. 
209 
