An analysis of two theropod dinosaur fossils has shown that they had a type of carpal bone (pisiform) in their wrists—a bone considered important to flight in birds. Subscribe to our newsletter for ...

A tiny, overlooked wrist bone called the pisiform may have played a pivotal role in bird flight and it turns out it evolved far earlier than scientists thought. Fossils from bird-like dinosaurs in ...

New Haven, Conn. — The evolutionary path from dinosaurs to birds included the development of a tiny wrist bone that ultimately proved crucial for stabilizing wings in flight. A new study suggests that ...

Ligaments are typically bands of fibrous tissue that connect one bone to another. The pisohamate ligament is part of the structure of the hand, where it connects the pisiform bone to the hook of the ...