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The Anatomy of Radius & Ulna

The radius and the ulna are the two bones of the forearm. Together they are unique as they allow for multiple movements such as flexion, extension, and rotation.


The ulna allows for flexion and extension with its articulation with the humerus.


The rotation is known as pronation and supination and is what allows your forearm to have palms up or palms down. Specifically speaking, the head of the radius will rotate on the capitulum of the humerus.


The ends of the radius and the ulna have these pointy structures known as styloid processes. If you were to grab towards your wrist you would be able to feel these two bony structures.


Here are a few resources to help you out with the ulna and radius.


Anterior View of Radius & Ulna

1-Radial Notch

2-Coronoid Process

3-Semilunar Notch (or Trochlear)

4-Head of Radius

5-Neck of Radius

6-Radial Tuberosity














Anterior Close Up View

1-Coronoid Process

2-Trochlear Notch

3-Radial Tuberosity

4-Head of Radius

5- Neck of Radius
















Posterior View of Radius & Ulna

1-Olecranon Process

2-Pointy Process of Trochlear Notch

3-Radial Notch

4-Head of Radius

5-Styloid Process of Ulna

6-Styloid Process of Radius




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