ventriduct
To bring, carry, or draw the head of an animal (or another body part) toward the belly or the lower (ventral) surface.
To obtain the white blood-corpuscles, pith a Necturus. To do this […] ventriduct the head, and press the thumb nail quite firmly against the dorsal side nearly opposite
Where it comes from
From ventri- (relating to the belly/ventral) and -duct (from the Latin ducere, meaning to "lead" or "draw").
Adapted from the Wiktionary entry ventriduct (CC BY-SA 4.0).