Abstract
The anal sac of a tiger was removed by incision of the anal canal and examined macroscopically and histologically. It lay on each side of the anus. Its opening was found to open at the top of a nipple located on the cutaneous zone adjacent to the anocutaneous line of the anus. The anal sac was filled with a viscid, malodorous, brown-yellowish fluid. The anal sac and its excretory duct were lined with a stratified squamous epithelium. The wall of the excretory duct consisted of very thin subepithelial connective tissue and a thick muscular layer, and that of the sac was composed of well-developed subepithelial stroma bearing many glandular tubules and a thick muscular band. The anal sac glands embedded in the connective-tissue stroma of the anal sac contain two kinds of glands, apocrine sudoriferous and sebaceous. The pattern of distribution of anal sac glands in the tiger was very close to that in the cat.
