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Abstract The present work deals with the development of the mondrocranlum of Corvus cor one sardonius. This accomplished through studying of six developmental stages The following interesting POlntS has been deduced.The anlage of the acrochordal cart; lage has a prior nucearance as compared wlth the other chondrocranial elementsles directly behlnd the hypophysis cerebri. The notocpord les a central posltion anteriorly, while it is situated to the cerebral surface than the ventral one malntains the same course as in the previous stage. the second stage of Corvus,the parachordal plate It has an isolated center of chondrification.The maintains the same course as in the previous stage behind the basal plate there are three segmental incomplete rings. |