Merkel-cell carcinoma of the skin.

Three cases of Merkel-cell carcinoma of the skin have been presented. The need for a correct clinical and histologic diagnosis has been highlighted. Rapid widespread growth of the tumor occurs when surgical treatment is delayed. Immunohistochemistry is essential for accurate differential diagnosis.     

The skin of primates. XXX. The skin of the woolly monkey. (Lagothrix lagotricha)

The anatomical and histochemical features of the skin of the woolly monkey are intermediate between those of the Cercopithecoidea and the Pithecoidea. The animal has a prehensile tail, the glabrous, friction surface of which is similar to that of the fingers. The epidermis is heavily pigmented. The dermal vascularization is relatively well-developed and similar to that of the skin of the Cercopithecoidea. Hair follicles grow in groups of 4 to 15, as in the skin of the Pithecoidea. In the hairy skin, eccrine sweat glands occur only in the tail and genitalia. The woolly monkey, like the green monkey, possesses only acetylcholinesterase-containing nerve fibers around its eccrine sweat glands.     

The skin of primates. 33. The skin of the Angwantibo (Arctocebus calabarensis)

The general behavior, locomotion, and body from of the angwantibo resemble those of Loris and Nycticebus. Its skin, however, is similar to that of Pottos and Galagos; singular among the similarities is the occurrence of alkaline phosphatase-positive dendritic cells in the epidermis. The presence of elongated, sausageshaped end-organs in the mucocutaneous region, the absence of arrector pili muscle, and the absence of alkaline phosphatase in the hair follicle nerve end-organs are distinctive features of angwantibos. These animals have a well-formed, complete nictitating membrane, thereby differing from all other primates studied.