. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Bony Core ABC Fig. 178. Horn formation in the pronghorn antelope, Antilocapra. A, appearance shortly after shedding the cornified integumentary "thimble"; B, later stage with a new epidermal "thimble" forming with an extra prong; c, old thimble tip ready to be cast off, with new horny thimble already formed within. (After Nitsche.) (d) Hollow horns. Finally, the most familiar kind of horns are the hollow horns of domestic and wild cattl
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Bony Core ABC Fig. 178. Horn formation in the pronghorn antelope, Antilocapra. A, appearance shortly after shedding the cornified integumentary "thimble"; B, later stage with a new epidermal "thimble" forming with an extra prong; c, old thimble tip ready to be cast off, with new horny thimble already formed within. (After Nitsche.) (d) Hollow horns. Finally, the most familiar kind of horns are the hollow horns of domestic and wild cattle, sheep, goats, and antelopes, which are usually present in both sexes. Unlike pronghorns, hollow horns are not periodically shed. As the horn wears away it is renewed from the Malpighian layer of the epidermis, just as any other dead corneal structure is restored from within, the hollow corneal layer fitting over a core of living bone attached to the frontal region of the skull. Hollow horns do not branch like antlers and pronghorns, but they assume a considerable variety of forms all the way from the majestic graceful spread characteristic of the Texas steer of the range, to the "cow with the (rumpled ; Polled, or hornless cattle were known long before cattle were domesticated by mankind, as shown by rude drawings of Palaeolithic polled cattle, depicted on the walls of prehistoric caverns of the cave dwellers in France and 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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Keywords: ., bookcentury1900, booksubjectanatomycomparative, booksubjectverte
