THE ANATOMICAL AND HISTOCHEMICAL PROPERTIES OF THE TONGUE OF PRIMATES

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Abstract
Each of the 9 species of prosimians studied possesses a well-developed sublingua; the tarsier (Tarsius syrichta) does not. Alkaline phosphatase-positive dendritic cells are encountered in the lingual epithelium of the 5 African lorisoids the pigmy bush-baby (Galago demidovii), lesser bushbaby (Galago senegalensis). great bushbaby (Galago crassicaudatus), potto (Perodicticus potto) and angwantibo (Arctocebus calabarensis). There is an increase in the number of vallate papillae present with phylogenetic ascention. The distribution of taste buds in the vallate papillae is similar to that of man only in the tamarin (Tamarinus nigricollis), howler monkey (Alouatta caraya) and Gorilla (Gorilla gorilla). Of the prosimians studied only the mongoose lemur (Lemur mongoz) has foliate papillae; all of the 13 simian primates studied have them. There are very few taste buds on the superior surface of the fungiform papillae. Taste buds are reactive for alkaline phosphatase and cholinesterases. There are species differences in the distribution of alkaline phosphatase. Both serous and mucous glands of all primates are surrounded by acetylcholinesterase-rich nerve fibers.

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