Which embryonic layer gives rise to glandular epithelium and the lining of the digestive tract?

The endoderm is the embryonic layer responsible for giving rise to the glandular epithelium and the lining of the digestive tract. During the process of embryonic development, the endoderm forms the innermost layer of cells that contribute to the formation of various internal organs and structures. Specifically, it differentiates into the epithelium of the gastrointestinal tract, respiratory tract, and several associated glands, including the liver and pancreas.

The ectoderm primarily contributes to the formation of the skin, nervous system, and other structures, while the mesoderm gives rise to the muscular, skeletal, and circulatory systems. The term "exoderm" is not used in standard embryological terminology, as it does not represent a recognized embryonic layer. Therefore, the endoderm is accurately identified as the source of glandular epithelium and the lining of the digestive tract, highlighting its significant role in the development of these systems.