From which germ layers do the extra-embryonic membranes form, and what are each membrane's functions?

What will be an ideal response?


The yolk sac forms from the endoderm and mesoderm; it is an important site of blood cell formation. The amnion forms from the ectoderm and mesoderm; it encloses the fluid that surrounds and cushions the developing embryo and fetus. The allantois forms from the endoderm and mesoderm; its base gives rise to the urinary bladder. The chorion forms from the mesoderm and cytotrophoblast; it surrounds the blastocoele.

Anatomy & Physiology

You might also like to view...

The triceps surae consists of three muscles in the lower limb.

Answer the following statement true (T) or false (F)

Anatomy & Physiology

The connection of the anterior portion of the tongue to the underlying epithelium is the

A) uvula. B) faux. C) lingual frenulum. D) labial frenulum. E) glossal septum.

Anatomy & Physiology

What is the term for removing the tip of a chick's mouth part? __________________________

Fill in the blank(s) with correct word

Anatomy & Physiology

Transfer of mRNA from the nucleus to the cytosol occurs through

A) tRNA. B) DNA. C) endocytosis. D) exocytosis. E) nuclear pores.

Anatomy & Physiology