The forearm appears wider and flatter. The muscle masses (brachioradialis and flexors) sit neatly on either side of the parallel bones. Pronation (Palm Down)

Explain how to handle around a bent elbow. Which area Share public link

2. The Mechanics of Forearm Rotation: Pronation vs. Supination

The upper arm bone features a spherical head that sits inside the shallow socket of the scapula. This ball-and-socket joint allows for a 360-degree range of motion. The distal end of the humerus flattens into two prominent bumps: the medial and lateral epicondyles. These bony landmarks remain visible under the skin and serve as crucial alignment markers for sculptors. The forearm bridge: Radius and ulna

: Recognising that the hand is naturally arched (not flat) from the carpal bones through the knuckles. Ulnar Furrow

The hand is a masterpiece of complex engineering. Instead of detailing every tendon, break the hand down into primary planes and mass blocks. The Three Main Masses of the Palm

The book utilizes a "visual language" to simplify complex anatomy into digestible geometric forms. Each pose is shown in four stages: Skin Layer: The surface appearance of the real 3D scan.

When the elbow bends (flexion) or straightens (extension), muscles change their volume and shape.