A List of some of the Body's vulnerable spots with a warning of their potential harm

The body is simultaneously tough and fragile. What follows is a list of the more fragile anatomy of the human body.
You must always be up-to-date on your knowledge of your state's self-defense laws, and do not go beyond them should you need defend yourself. If you have no way to escape and no other option, and all attempts (if time permitted) of defusing the confrontation have failed, then meet force with equal force.
1. The temples. They are relatively flat, which is not as thick and damage resistant as curved bone, such as the curved bone at the place where the forehead rounds at the beginning of the top of the head. Referral shock is transmitted more readily and directly through flat, relatively thin bone like at the temples. The temples are located just above and forward of the ears.
2. The eyes.
3. The ear canals.
4. the tip of the nose.
5. Just upward under the nose.
6. The philtrum (the vertical groove on the surface of the upper lip, below the septum of the nose).
7. The point of the chin.
8. The thyroid cartilage, i.e., the Adam's Apple on the Larynx..
9. The supra-sternal notch (the hollow depression at the base of the throat).
10.The sternocleidomastoid muscles (one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone. These muscles enable the head to turn while slanting it, or to turn the head and turn it into a slant. They also allow the head to lean from side to side).
11.The vagus and phrenic nerves that run down the inner side of the sternocleidomastoid muscle about an inch above the inner ends of clavicles for the phrenic nerve, a little higher for the vagus nerve.
12.The carotid artery, running vertically up the neck and crossing over the sternocleidomastoid muscle.
13.The brachial plexus.
14.The clavicles.
15.The center of the sternum (breast bone in center of chest).                                                   16.The xiphoid process (the cartilaginous  projection forming the lowermost part of the sternum).
17.The solar plexus ( a deep bundle of nerves between the sternum and the upper abdomen).
This is just a small list. Many more could be found in charts and books or internet searches. As I said at the start, don't use more force than necessary (in fact you don't have to use as much force against an opponent as is used against you, even if it's deadly force. You need only use enough to incapacitate your opponent so you can flee), and know your state's self-defense laws.