trisplanchnic

from The Century Dictionary.

• Pertaining to the viscera of the three great cavities of the body—the cranial, thoracic, and abdominal: noting the sympathetic nervous system.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Anat.) Of or pertaining to the three great splanchnic cavities, namely, that of the head, the chest, and the abdomen; -- applied to the sympathetic nervous system.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective anatomy Of or pertaining to the three great splanchnic cavities: those of the head, chest, and abdomen.