Examples of use of outside layer
1. The cortex is the outside layer of the brain and the motor cortex is known as the "excitable area" because magnetic stimulation has been shown to cause a muscle twitch.
2. Others have built an extra wall covering the original outside layer of the building, leaving a one–meter space between the two and opening a window–shaped exit to jump out in case of a police raid.
3. The 48million–year–old amphibious mammal is the ancestor of all whales Its bones had a thick outside layer – a characteristic normally seen in wading animals such as hippos, where the extra weight helps them cope with fast currents.