. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 410 COMPARATIVE PHYSIOLOGY. The muscles of the skin, which either move it as a whole or erect individual hairs, play an important part in modifying ex- pression, well seen in the whole canine tribe and many others. There are several modifications of the sebaceousglands that furnish highly odor- iferous secretions as in the civet cat, the skunk, the musk- deer, and many low- er vertebrates. In some, these are pro- tective (skunk) ; in others, though they may not
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. 410 COMPARATIVE PHYSIOLOGY. The muscles of the skin, which either move it as a whole or erect individual hairs, play an important part in modifying ex- pression, well seen in the whole canine tribe and many others. There are several modifications of the sebaceousglands that furnish highly odor- iferous secretions as in the civet cat, the skunk, the musk- deer, and many low- er vertebrates. In some, these are pro- tective (skunk) ; in others, though they may not be agreeable to the senses of man, they are doubtless at- tractive to the fe- males of the same tribe, and are to be regarded as impor- tant in "sexual se- lection," being often confined to the males alone. Ear-wax and the Meibomian secretion are the work of modified sebaceous glands ; as also the oil-glands so highly developed in birds, especially aquatic forms, and of which these creatures make great use in preserv- ing their feathers from wetting. In our domestic animals we may es- pecially notice a cu. Fig. 313.—Hair and hair-foUicle (after Sappey). 1, root of hair; 2, bulb of bair: 3, internal root-slieatli; 5, membrane of hair-follicle; 6, external membrane of follicle; 7, 7, muscnlar bands attached to follicle; 8, 8, extremities of bands passing to skin; 9, com- pound sebaceous gland, wim duct (10) opening mto upper third of folucle ; U, simple sebaceous gland; IS; opening of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New York, Appleton
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