Abstract
AbstractThe skin of the red uacari (Cacajao rubicundus) is characterized by distinctive traits. Pigmentation of both the epidermis and dermis in juvenile animals resembles a similar condition recorded in adult Callithricidae. Extensive capillary sinuses pervade the upper dermis of the face, ears, forehead, and frontal scalp. Hederiform nerve endings are common in the face and scalp, as are papillary nerve endorgans in the volar friction surfaces; both are reactive for specific and pseudocholinesterase. A general diminution in size of hair follicles and a retarded generative cycle contribute to the phenomenon of “baldness” in the forehead and scalp of mature animals. Apocrine glands are quantitatively diminished over the dorsum. Eccrine sweat glands, confined to the palmar and plantar friction surfaces, are poorly differentiated; all secretory cells contain glycogen.
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