The arachnotetrapods are a type of animal in my worlds with an anatomical setup that is hard to figure out
Specifically, it has an arachnid-like intestine, with many branches going out into the limbs, but the limbs have an internal skeleton with a series of long bones, as in tetrapods
This presents a problem for their anatomy: In arachnids, the intestinal branches go down the middle of the limb. However, in tetrapodal limbs normally have bones and muscles running there, with no internal spaces for the intestines
Is there any way that these intestines could fit into these limbs?
The answers must relate to the combination of the arachnid intestine, which extends into the limbs, and the tetrapod limbs, which are supported by internal long bones. Do not mention other organs or structures besides the limbs and the branches of the intestine. This question is specifically about the structures described above (limbs and intestine), nothing else