microsplanchnic

mi·cro·splanch·nic

(mī'krō-splangk'nik),
Referring to smallness of the abdominal viscera.
[micro- + G. splanchna, viscera]

microsplanchnic

(mī″krō-splănk′nĭk)
Having a relatively small abdominal cavity in comparison with the rest of the body.