Final answer:
The ascending mesocolon refers to the portion of the mesocolon that attaches to the ascending colon. It varies in length and provides support and mobility to the ascending colon in different species.
Step-by-step explanation:
The ascending mesocolon refers to the portion of the mesocolon that attaches to the ascending colon. The mesocolon is a fold of the peritoneum that connects the colon to the posterior abdominal wall. In some species, such as humans, the ascending mesocolon is relatively short and allows for more mobility of the ascending colon. In other species, such as dogs, the ascending mesocolon is longer and provides additional support to the ascending colon