in successful experiments the epithelium of the chorio-allantois fuses with that of the graft , the collagen fibers of the corium interlace with those of the membrane after the separation or disappearance of the ectodermal layer , and the blood vessels of the chick anastomose , and unite by intervening pools of extravasated blood , with those of the graft .
C0225325
collagen fibers
C0011646
corium