Which part represents the muscles and blood vessels? 
Definitions:
Chorion
The outermost membrane surrounding an embryo in mammals, birds, and reptiles, contributing to the formation of the placenta in placental mammals.
Amnion
A thin membrane forming a closed sac around the embryo in birds, reptiles, and mammals.
Yolk Sac
An extra-embryonic membrane that provides food in the form of stored yolk to the developing embryo in eggs and early vertebrates.
Epididymis
A long, coiled tube located at the back of the testis that stores and carries sperm.
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