Supinator

Around the proximal radius

Supinator occupies the upper forearm around the proximal radius. Study its curved route in three dimensions rather than assuming that the visible front surface is the whole muscle.

This page selects one supinator mesh. The source does not offer separate superficial and deep parts in this subset.

Sources: Loyola anatomy

Bony and ligamentous origins

The origins include the ulna’s supinator crest and fossa, the humeral lateral epicondyle, and the annular and radial collateral ligaments. The insertion extends onto the proximal radius.

Only the radius and ulna are loaded in this page’s context. The missing humerus and ligaments mean that not all the described origins can be inspected here.

Sources: Loyola anatomy

The supination side of rotation

Supinator contributes to forearm supination, the rotational action opposite to pronation. Compare it with the two pronators without confusing camera movement with joint movement.

The model is a static surface reconstruction. Front, Back and Oblique change the camera, not the position of the radius relative to the ulna; no muscle contraction is simulated.

The guide describes an action; the model shows shape and relative position. It does not estimate muscle strength or the range of motion of a particular person.

Sources: Loyola anatomy

Deep radial-nerve supply

Supinator is supplied by the radial nerve’s deep branch. Recurrent interosseous arterial branches contribute to its blood supply.

Nerves and vessels are not loaded in this subset, so the text describes connections you cannot select in the viewer.

The nerve is not visible passing through this mesh. Neither a passage nor an entrapment site should be inferred from a surface indentation alone.

Sources: Anatomy tables

Read the model

Explore supinator in 3D

1. Look around the surface. Start isolated, then alternate Front and Back or drag to inspect the opposite face. A single view can hide the curvature.
2. Locate the proximal radius. Choose Show context and select Radius, then return to Supinator. Use Fade others to retain spatial cues while emphasizing the muscle.
3. Compare opposite actions. Select Pronator quadratus or either Pronator teres head. Open its dedicated page from the selected title to read the corresponding guide.

Sources and editorial status

This guide uses independently written explanations with links to the evidence behind them. Source checking and specialist anatomical review are separate steps; the latter is still pending.

1. Loyola University Chicago — LUMEN, Supinator

   Origins, radial insertion and supination action. Nerve naming varies between teaching resources; this guide uses deep branch of the radial nerve as in the Texas Tech table.

2. Texas Tech University Health Sciences Center El Paso — Forearm & Wrist anatomy tables

   Supinator and deep radial nerve entries: nerve and recurrent interosseous arterial supply.

3D geometry and its separate license are credited beneath the viewer. References do not imply endorsement of this site.