Furcula

Definition

The furcula, commonly known as the wishbone, is a forked bone found in birds and some dinosaurs. It is formed by the fusion of two clavicles and plays a crucial role in flight mechanics.

5 Must Know Facts For Your Next Test

1. The furcula acts as a spring to store and release energy during flight.
2. It helps strengthen the thoracic skeleton to withstand the rigors of flight.
3. The presence of a furcula is one of the key anatomical features distinguishing birds from other vertebrates.
4. The size and shape of the furcula can vary significantly between bird species depending on their flying habits.
5. Fossil evidence suggests that some theropod dinosaurs also had a furcula, hinting at an evolutionary link to modern birds.

Review Questions

• What is the primary function of the furcula in birds?
• How does the structure of the furcula contribute to its role in flight?
• Which group of ancient animals also possessed a structure similar to the furcula?

Related terms

Clavicle: A bone that forms part of the shoulder girdle; in birds, two clavicles fuse to form the furcula.

Keel: An extension of the sternum (breastbone) which provides an attachment point for powerful flight muscles.

Coracoid: A paired bone in bird anatomy that connects with both the scapula and sternum, aiding in wing movement.