HEAD INJURY
The head is very vulnerable to injury, often with severe consequences. It is particularly
susceptible to acceleration/deceleration and rotational forces because it is heavy in relation to its
size (3-6 kg, avg 4.5 kg or 10 lb), is freely mobile in 3 dimensions and occupies a relatively
unstable position, being secured only by the neck muscles and ligaments.
see pdf : journal-of-forensic