HomePhilippine Journal of Veterinary Medicinevol. 51 no. 2 (2014)

Histological and Histochemical Features of the Lingual Glands of Hybrid Pig and Philippine Native Pig Sus scrofa domesticus (Linnaeus, 1758) (Artiodactyla: Suidae)

Ceferino P. Maala | Aron Roy C. Hisole | Rio John T. Ducusin

Discipline: Anatomy



The histological and histochemical features of the lingual glands in hybrid and Philippine native pigs were studied using tissue sections stained with Hematoxylin-Eosin and special tissue stains. In both breeds, glands were observed in the lamina propria-submucosa and tunica muscularis near the vallate papillae, dorsolateral border of the body of the tongue rostral to the region of the vallate papillae and at the dorsal surface where fungiform papillae were abundant. Glands were more developed in the tunica muscularis than those in the lamina propria-submucosa. Glands were predominantly mucous, except the serous glands near the vallate papillae. Glands at the dorsolateral aspect of the body of the tongue were smaller than those at the region of the vallate papillae and at the dorsal surface of the root of the tongue. Striated ducts were observed in both breeds. The connective tissue framework was poorly developed, consisting mainly of collagen fibers. The mucous secretory units of the lingual glands reacted strongly to Humason’s mucicarmine, periodic acid-Schiff and alcian blue pH 1.0 and 2.5 stains. The histology and histochemistry of the lingual glands in both breeds were similar to what have been reported in veterinary literature for domestic animals.