ventral

adjectives

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"
is derived from
is derived from
is derived from
antonym
is similar to
extending from the back to the belly
nearest to or facing toward the axis of an organ or organism
"the upper side of a leaf is known as the adaxial surface"