es embryonic folding which places forming tissue types into their proper positions. ??? ??? ??? the embryonic folding results from proliferation of the ectoderm ??? ??? ??? The folding tissued mainly occurs near the cephalic end, where the brain will form ??? ??? ??? the anterior part of the tube is the foregut ??? ??? ??? the foregut forms the primitive pharynx ??? ??? ??? the mature pharynx is f