Wing
one of those organs in animals by which flight is effected. In their most typical development, as seen in birds, wings consist of the bones of the fore limbs, specially modified to form a support and axis, while attached to this Underwood & Underwood WOODROW WILSON Enc. Vol. 10-p. 388 Underwood & Underwood THE FIGHT OF THE MARINES IN BELLEAU WOOD. FROM THE PAINTING BY THE FRENCH ARTIST, GEORGES SCOTT Committee on Public Information AMERICAN TROOPS POURING INTO THE ST. MIHIEL SALIENT, TOWARD MONT SEC, ON THE MORNING OF SEPTEMBER 12, 1918 AMERICAN SOLDIERS ON THE WAY TO BREAK THE HINDENBURG LINE, SEPTEMBER 29 1918 U. S. Official Photo AMERICAN SOLDIERS RESTING IN A SHALLOW TRENCH IN THE ARGONNE FOREST Photo, Wide World Photos THE SCENE IN THE TRIANON PALACE AT VERSAILLES WHEN PREMIER CLEMENCEAU ANNOUNCED THE TERMS OF THE ALLIES TO THE GERMAN DELEGATES CHE CROWD SURGING AROUND VERSAILLES PALACE, AFTER THE SIGNING OF THE TREATY, JUNE 28, 1919 Keystone View Company MODEL FOR "THE WARS OF AMERICA," BY GUTZON BORGLUM-A SOLDIERS' MEMORIAL MONUMENT FOR NEWARK, N. J. WINGATE skeleton are the muscles moving the limb.
Externally the skin is provided with feathers, and the whole fore limbs of the bird thus form the wings; while the bones of the shoulder girdle are modified to form a special support for the organ of flight. In the bat the wing consists of an expansion of the skin or integument, supported on four of the fingers, which are extremely long. This membrane, or patagium, extends from the fore limbs to the hind limbs, and in many cases between the hind limbs and tail as well. In such mammalia as the flying foxes, flying flyi flying foxes, flying squirrels, flying phalangers, and in the lizards known as flying dragons, the wing is a mere expansion of skin, extending along the side of the body, often connecting hind and fore limbs, and serving as a parachute to sustain the animals in their flying leaps from tree to tree, but in no sense serving as an organ of true flight. In insects the wing is formed of two delicate skin layers, supported on hollow tubes or nervures, placed in communication with the respiratory or breathing system. The wings of insects become thus related to respiration, and by their movements probably aid in the diffusion of air through the breathing tubes.