Questão de Histologia

What are the main stages of growth and development of the limbs in the embryonic period?

A

Appearance of the anterior limb, followed by the posterior limb; formation of the apical ectodermal ridge (AER); differentiation of the stylopod, zeugopod, and autopod; formation of the zone of polarizing activity (ZPA); endochondral ossification.

B

Appearance of the posterior limb, followed by the anterior limb; formation of the apical ectodermal ridge (AER); differentiation of the stylopod, zeugopod, and autopod; formation of the zone of polarizing activity (ZPA); endochondral ossification.

C

Appearance of the anterior limb, followed by the posterior limb; formation of the zone of polarizing activity (ZPA); differentiation of the stylopod, zeugopod, and autopod; formation of the apical ectodermal ridge (AER); endochondral ossification.

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