The main parts of a Tropical Cyclone are the eye, the eyewall and the rainbands. The Eye is the cyclones centre where the air is sinking and is relatively clam winds at the maximum of 24km/hr. The Eye is around 32-64km. The Eyewall consists of a ring of tall thunderstorms that produce heavy rain and strong winds. The Rainbands are curved bands of clouds and thunder storms that spiral away from the eyewall. The rainbands create strong spurts of rain and winds, sometimes even tornados. Most hurricane strength cyclones are about 483km wide although they can vary depending.
Cyclone Diagram
National Gepgraphic Geomorphic Hazards | Page 7