Universlty of Manitoba, ln Partîal Fulfiìlment - MSpace at the ...

Figs. l+7 ^ 5A, Ëversic¡n of the neuraT foÏds as the first sígn oi'
non-closure of the rhomboîd sinus. Developing protonotqchord
(l ¿ r; x4o) :
Fíg. l+7.
Control St. 10 embryo, 6 hours af ter the tîr'le of
windor,ring, with clevaied neuraì folds at the posterior
rhomboi d s i nus (6C Z1) .
Fig. 48.
Experimental St. t0 embryo, 6 hours after windowing,
with everted neural folds êt the posterior rhomboid
sinus (61 45) .
FiS. 49.
ContrÕl St, l1+ embryo, 18 hours after the. time of
windowing, wi th further differentiation of elevated
neural folds ar the posrerior rhomboid sinus (18C 4).
FiS. 50.
Experìmental St. f l-F embryo, 6 hours after wîndowing,
w¡th further differentiatîon of everted neural folds
at the posrerior rhomboid sinus (6E 34).