Upper limb · Study 02

Inside the elbow.

Three bones. A meeting point between arm and forearm. Start with the joint surfaces, then reveal the muscles around them.

Atlas noteRight-sided, static 3D study. Cartilage, capsule and ligaments are not included in this model. Anatomical review is still required.

RIGHT ELBOW · JOINT CLOSE-UPBodyParts3D / 4.0

Start with the bones

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Gold = selected structure Click to select · double-click / double-tap to open
Drag to rotate · pinch or scroll to zoom

Explore the layers

Bones 3 Muscles & parts 10

Bone surfaces only at the joint: cartilage, capsule and ligaments are not modeled. This is a static pose, not a movement simulation.

SELECTED · RIGHT SIDE

Ulna

FMA23467 · FJ3391

About Ulna

The ulna occupies the medial side of the forearm in anatomical position.

The olecranon forms the elbow tip. The trochlear notch receives the humeral trochlea; the nearby radial notch meets the radial head.

Turn to Back, then isolate the bone. Compare its upper end with the radius using the structure selector.

Reading source: OpenStax ↗Source-checked summary; clinical review pending. Landmarks are not separate selectable meshes.

Open structure page →

Choose a structure Also works without clicking the model

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BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International. Sources & changes · Model provenance

01 / Geometry

See around, not just through.

The 3D subset keeps the source positions of 13 separate structures. Rotate the arm, hide a layer, or isolate a muscle to inspect its shape.

02 / Explore

Start with the bones.

Use the three bone-study buttons, then open About in the selected structure’s card. Show context restores all layers and zooms out; Elbow close-up returns to the joint.

Scope / Honest limits

Shape is not photorealism.

This is a reduced-resolution model, not a complete dissection. Skin, vessels, nerves and most neighboring muscles are omitted. Colors and shading are illustrative; there are no realistic muscle-fiber textures. Anatomical review is still required.

Overview

Where arm meets forearm

The elbow region brings together the humerus, ulna and radius. The humeroulnar articulation acts as a hinge: the trochlea of the humerus meets the trochlear notch of the ulna. The humeroradial articulation lies beside it.

Two kinds of movement

Elbow flexion and extension bend and straighten the arm. Forearm rotation is different: at the proximal radioulnar joint, the radial head turns within a ring formed by the annular ligament and ulna, contributing to pronation and supination.

What this model cannot show

The joint capsule and supporting ligaments help maintain stability, but they are absent here. The visible bone surfaces do not represent articular cartilage. Rotating this model changes your viewpoint; it does not demonstrate joint movement.

Reading source: OpenStax — Anatomy of Selected Synovial Joints. Educational prototype, not a diagnostic tool.