Usage examples (34)

• The inner layer we call the entoderm, the outer the ectoderm; and the "primitive mouth" is known as the blastopore.
• Beneath the primordial brain an invagination of the ectoderm against the entoderm is formed, later to become the mouth.
• These three layers are called ectoderm, mesoderm, and entoderm from outside inwards respectively.
• Mesenteron: the mid-gut, stomach or chylific ventricle: the middle portion of the primitive intestinal canal, lined with entoderm.