Veterinary Embryology 8.1 - 8.4: Primitive streak formation

Question

Primitive streak formation

Magdalena Badenhorst · Accepted Answer

A dull, thickened stripe develops in the middle of the epiblast in the caudal half of the embryonal disc. It is formed by the medial and caudal migration of proliferating epiblast cells
Continued cell migration causes cranial elongation of the primitive streak until it extends over all but the cranial third of the embryonal disc.

Magdalena Badenhorst · Answer

On the epiblast surface, a primitive streak forms as differential cell growth generates a pair of ridges separated by a depression.

Veterinary Embryology 8.1 - 8.4

Primitive streak formation

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