To mention: The three extraembryonic membranes and summarize their functions. Concept introduction: By the eighth day of fertilization, the cells of embryoblast begin to differentiate into two layers called hypoblast and epiblast layers. Hypoblast layer is a layer of small cuboidal cells formed adjacent to the blastocyst cavity. Epiblast layer is a layer of columnar cells formed near the amniotic cavity. Both hypoblast and epiblast layer together form a flat disc like structure that is termed as bilaminar germinal disc.

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Chapter 29.2, Problem 9LO

Summary Introduction

To mention: The three extraembryonic membranes and summarize their functions.

Concept introduction: By the eighth day of fertilization, the cells of embryoblast begin to differentiate into two layers called hypoblast and epiblast layers. Hypoblast layer is a layer of small cuboidal cells formed adjacent to the blastocyst cavity. Epiblast layer is a layer of columnar cells formed near the amniotic cavity. Both hypoblast and epiblast layer together form a flat disc like structure that is termed as bilaminar germinal disc.

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