Stomach

The stomach is a muscular, hollow, dilated part of the digestion system which functions as an important organ of the digestive tract in some animals, including vertebrates, echinoderms, insects (mid-gut), and molluscs. It is involved in the second phase of digestion, following mastication (chewing).
The stomach is located between the esophagus and the small intestine. It secretes protein-digesting enzymes and strong acids to aid in food digestion, (sent to it via oesophageal peristalsis) through smooth muscular contortions (called segmentation) before sending partially digested food (chyme) to the small intestines.

Filariasis

Filariasis is a disease group affecting humans and animals caused by nematode parasites of the order Filariidae, commonly called filariae. Filarial parasites may be classified according to the habitat of the adult worms in the vertebral host. The cutaneous group includes Loa loa, Onchocerca volvulus, and Mansonella streptocerca. The lymphatic group includes Wuchereria bancrofti, Brugia malayi, and Brugia timori. The body-cavity group includes Mansonella perstans and Mansonella ozzardi.