300 



HEART FIELD OPERATION 



25 



^S^^^M 



■;-\/ HEART 



.uy 



ARE A'Y^- •••'•'• ■ 



\ 



,-%/ 



GILL ANLAGE 



PRONEPHRIC AREA 



vijJ ^MANDIBULAR ARCH 



AMBLYSTOMA 



4TH . BR. CLEFT 



OPTIC VESICLE 



SENSE PLATE 



TRAPEZOID AREA 

 HEART AREA 



RANA PIPIENS « STAGE 15 



