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Fig. 1. Endoderm zone I ablation prevents mesethmoid formation.
(A-B') Frontal (A) and lateral (B) views of the cephalic skeleton
of a chick embryo at 9 days (HH35) with corresponding drawings
(A',B'), highlighting the elements of the nasal capsule: blue,
mesethmoid (mes); red, ectethmoid (ect); green, infraorbital septum (is). Mc,
Meckel's cartilage. (C) Schematic of the surgical procedure of endoderm
zone I (EZ-I) ablation. I and II, endoderm zones I and II; r1-r8, rhombomeres
1 to 8. (D) Lateral view of the chondrochranium of a representative
HH35 embryo in which EZ-I has been ablated at the 5-somite stage. (Upper
inset) The same embryo before skeletal preparation. (Lower inset) Frontal view
of the same embryo showing the normal size and shape of the ectethmoid.
(D') Drawing corresponding to D, using the same colour code as
above. Note the absence of the mesethmoid, whereas the ectethmoid and the
infraorbital septum are still present.
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