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The fetal membranes are membranes associated with the developing fetus. The two chorioamniotic membranes are the amnion and the chorion, which make up the amniotic sac that surrounds and protects the fetus.[1] The other fetal membranes are the allantois and the secondary umbilical vesicle.[2]

Fetal membrane
Latinadnexa fetalia
Anatomical terminology


  1. ^ UpToDate Patient Preview > Fetal membranes: Anatomy and biochemistry Author: Seth Guller, PhD. Retrieved on Mars 7, 2010
  2. ^ Clinically Oriented Embryology Keith L Moore