Aquatic Mammals Their Adaptations to Life in the Water
Aquatic Mammals Their Adaptations to Life in the Water
A Brazier Alfred Brazier Howell
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The latter is exceedingly broad and powerful, and partly tendinous throughout a considerable portion of its length, so that it could well perform such a static function. Further- more its palmar tendon splits into two parts, the more robust of which extends along the radial border of the hand and the other along the ul- nar border. Flexion while forcing the palm against the water would accordingly have a cupping action upon the palm, the force being more pronounced along the anterior border. Th...e fourth head of the flexor digitorum communis and the flexor carpi radialis, in addition to the ex- tension of a part of the pectoral, are also well disposed to act upon the radial border of the flipper, so that the latter has an unusually powerful equipment for sweeping the flipper obliquely through the water after the manner that will prove most effective in propulsion. The nails of the manus in the sea-lion should receive further brief mention. As the part of the flipper distad of the bony termination of the digits cannot be folded back against the palm the nails can no longer be used in scratching the body or in any other effective way.
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