The structural characterization of the lacrimal gland in the adult dog (Canis familiaris)

Abstract

To elucidate the macroscopical and microscopical structure of dog's lacrimal gland, 15 adult dogs (Canis familiaris) wereutilized in this study. Macroscopically, the lacrimal gland was located on the dorsolateral aspect of the eyeball andbounded dorsolaterally by the orbital ligament, zygomatic process of the frontal bone and frontal process of malar bone.Its shape was nearly rectangular with the average width (1.38 ± 0.13 cm) and length (1.52 ±0.12 cm). In between thedorsal and lateral rectus muscles, the lacrimal artery, vein and nerve were observed. Microscopically, the lacrimal glandwas enveloped by the fibromuscular capsule and lobulated. Each lobule was formed of secretory endpieces and ducts.The secretory endpieces were mucous and serous. However, the mucous type was predominant. The lining cells of thesecretory endpieces expressed a positive reaction to alcian blue and Periodic acid Shiff. A series of duct system withinthe lobules and septa was seen. The scanning electron microscopic examination revealed that the secretory endpiecescovered with granular secretory substance. Several crystals with sharp taper ends were seen around the secretoryendpieces