What does mesenteron mean?
The mesenteron is the primitive middle region of an embryo's developing digestive tract. It forms before the intestine is fully differentiated and gives rise to much of the small and large intestines. Embryologists use the term to describe an early stage of gut development, when the primitive alimentary canal can still be divided broadly into foregut, midgut, and hindgut. The word also occurs in comparative zoology, where it can describe a digestive tract between the foregut and hindgut. Its formation is an important part of the development of the digestive system, particularly the intestinal region. Although the modern term midgut overlaps with it and may be used in describing the same region, mesenteron more often names the earlier embryonic structure itself. The word comes from Greek roots meaning “middle” and “intestine,” accurately reflecting its position and developmental role.
nounThe primitive middle portion of the embryonic alimentary canal, which develops into much of the intestine. In some zoological contexts, the term refers more broadly to the digestive tract between the stomach and the posterior end of the body.
- The primitive middle portion of the embryonic alimentary canal that gives rise to much of the intestine.
- In some animal anatomy contexts, the digestive tract lying between the stomach or foregut and the hindgut.
"The mesenteron lengthens rapidly as the embryo begins to form its intestinal tract."
"During development, the mesenteron expands to form much of the small and large intestines."
"In the animal described, the mesenteron is a straight digestive tube extending through the body cavity."
The plural is rare because the word is normally used in specialized biological contexts.
"The researchers compared the developing mesenterons of several embryonic specimens."
Before an embryo has a recognizable intestine, it has a mesenteron—the middle digestive cavity from which much of the intestinal system will develop.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does mesenteron come from?
Mesenteron comes from the Greek mesenteron, a term formed from mesos, meaning “middle,” and enteron, meaning “intestine.” It was adopted into anatomical and embryological English with the meaning of the primitive middle portion of the digestive tract. Its relatives include mesentery, mesenteric, and mesenteritis, all associated with the supporting tissues and medical terminology of the intestines.
Related word forms
How mesenteron is actually used
Mesenteron is chiefly a technical term in embryology and comparative anatomy. In embryological writing, it is more specific than the modern term midgut, although the two terms overlap in usage.
Easily confused with mesenteron
Midgut is the modern embryological term for the developing region of the intestine, whereas mesenteron more precisely names the primitive embryonic gut as a whole or its middle portion.
The mesenteron is a cavity or region of the primitive gut, while the mesentery is the fold of tissue that supports the intestines and attaches them to the body wall.