The ulna is a long bone.
The ulna, a key bone in the forearm, is classified as a long bone due to its characteristic shape and proportions. Long bones are defined as having a shaft (diaphysis) that is significantly longer than its width, and expanded ends (epiphyses). The ulna perfectly fits this description:
- Long Shape: The ulna is elongated, forming the medial aspect of the forearm.
- Diaphysis (Shaft): It possesses a distinct shaft, which is the main body of the bone.
- Epiphyses (Ends): It features an expanded proximal end (near the elbow) and a head at the distal end (near the wrist).
This classification is important because the shape of a bone often relates to its function. The elongated structure of the ulna allows for levers to attach, which is important for forearm movement and supporting weight.
