The human body is made up of many vulnerable spots Some are nerve centers some are organs unprote

“The human body is made up of many vulnerable spots. Some are nerve centers, some are organs unprotected by a bony or muscular structure, and some are areas only lightly protected by bone or muscle tissue. About a dozen such spots can be attacked with marked results in combat.”

Applegate, Rex. Kill or Get Killed: A Manual of Hand-to-Hand Fighting. Paladin Press, 2007, loc. 25.