The relation of the first plane of cleavage and the grey crescent to the median plane of the embryo of the frog

1) When the first plane of cleavage coincides with the median plane of the grey crescent, the median plane of the embryo coincides with these two. li]2)|When the first plane of cleavage is at right angles to the median plane of the grey crescent, the median plane of the embryo usually coincides either with the first plane of cleavage or with the median… CONTINUE READING