pressure point

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of several points on the body at which an underlying artery can be pressed against a bone to stop distal bleeding.
2. n. An area on the skin that is highly sensitive to the application of pressure.

Wiktionary

1. n. martial arts A specific small area of the body targeted, due to a cluster of nerves being close to the skin, usually not protected by bone.

WordNet 3.0

1. n. where problems or difficulties are likely to occur
2. n. an area on the skin that is highly sensitive to pressure
3. n. any of several points on the body where the pulse can be felt and where pressure on an underlying artery will control bleeding from that artery at a more distal point