ventral -- (toward or on or near the belly (front of a primate or lower surface of a lower animal); "the ventral aspect of the human body"; "the liver is somewhat ventral in position"; "ventral (or pelvic) fins correspond to the hind limbs of a quadruped")
adaxial, ventral -- (nearest to or facing toward the axis of an organ or organism; "the upper side of a leaf is known as the adaxial surface")
(Sound)
