Fitness ball bridge with heel dig

Knee extension with weight machine

The knee extension exercise targets the front of the thigh. See how it's done.

Mitral valve repair surgery

Watch this video to see how doctors do mitral valve repair surgery.

Endoscopy

Endoscopy allows your doctor to view your esophagus, stomach and part of your duodenum.

Athetosis resulting from basal ganglia injury

This animation illustrates the location of basal ganglia in the brain. Injury to the basal ganglia may result in athetosis (constant writhing movements of the body).

• Injury
• Headache

Anatomy of Nicotine Addiction

This animation illustrates how smoking changes your brain, causing nicotine addiction.