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Ulna


ulna
bone that together with the radius forms the forearm
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Ulna Elbow.
ultimate causation (factors) Those aspects of behavior that are concerned with why the behavior evolved and its functional significance in an ecological context.
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ulna
The posterior of two bones of the forearm of tetrapods. The ulna articulates proximally with the humerus and distally with the carpals.
Covered in Lab 13 Animal Diversity III ...
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Hinge joints, such as the elbow (between the humerus and the ulna). These joints act like a door hinge, allowing flexion and extension in just one plane.
Pivot joints, such as the elbow (between the radius and the ulna).
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Primates have modifications to their ulna and radius (bones of the lower arm) allowing them to turn their hand without needing to turn their elbow. Many primates can also swivel or turn their arms at the shoulder.
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When mice were bred with homozygous mutations for both HoxA11 and HoxD11, they were born with neither radius nor ulna in the forelimbs.
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