belly
The central portion of a muscle.
biceps
A group of muscles present in the upper forelimb of tetrapods, which are flexors of the elbow joint. In the hind limb, the biceps femoris is a flexor of the knee and an elevator of the femur.
belly
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
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[L. venter, belly]
Pertaining to the undersurface of an animal that holds its body in a horizontal position; to the front surface of an animal that holds its body erect.
ventricle ...
The inferior belly of the Omohyoideus divides the posterior triangle of the neck into an upper or occipital triangle and a lower or subclavian triangle, ...
celiac koilia = belly.
cell Minute biological compartments within which the processes of life are carried out.
cell body Portion of a nerve cell that includes a cytoplasmic mass and a nucleolus, and from which the nerve fibers extend.
[L. gastrula - the belly, stomach] The process in embryonic development whereby the three primary germ layers are laid down and the gut formed through complex cell migrations.
Symptoms of kwashiorkor include a swollen abdomen known as a pot belly, as well as reddish discoloration of the hair and depigmented skin.
In vertebrates such as mammals the abdomen (belly) constitutes the part of the body between the thorax (chest) and pelvis. The region enclosed by the abdomen is termed the abdominal cavity. In arthropods it is the most distal...
Full article ...
Something which by its shape or use suggests an apron; as, The fat skin covering the belly of a goose or duck.
gastrula - the belly, stomach] The early embryonic stage following the blastula stage during which cell migrations form distinct germ layers. The primitive gut (archenteron) is formed and opens to the exterior through the blastopore.
front and rear (the anterior-posterior axis)
back side and belly side (its dorsal-ventral axis)
left and right sides.
Essentially, there's a cascade of genes which is forming the axis along both the anterior and posterior-the front and then the sort of dorsal to ventral, or the belly to the back of the animal. And these gene position along the embryo.
mouth -- Front opening of the digestive tract, into which food is taken for digestion. In flatworms, the mouth is the only opening into the digestive cavity, and is located on the "belly" of the worm.
That change in direction allows reptiles to pick their bellies off the ground and helps them move more efficiently. It's obvious that this trait doesn't apply to snakes that have no legs. They have their belly on the ground or on a tree limb all day ...
 See also: Human, Class, Muscle, Posterior, Trans
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