Snakes have seven inches, humans also have seven inches:

1. Carotid sinus
Located about two finger-widths below the angle of the jaw, at the bifurcation of the carotid artery. Excessive twisting of the neck or improper pressure may cause dizziness, blackouts, or even fainting.
2. Foramen magnum
Located at the midline of the back of the skull, slightly lower, connecting the brainstem and spinal cord, it is the core center responsible for controlling breathing and heartbeat. Strictly prohibited in combat sports like boxing and fighting to strike the back of the head, to protect this critical area. Severe external impact can directly damage the vital center, instantly threatening life signs.
3. Temporal region
One of the thinnest areas of the skull, with an average thickness of only 1-2mm, lying close to the middle meningeal artery. External blows can cause hidden intracranial bleeding, often with no obvious external injuries, and the injured person may have a brief, seemingly normal recovery window. The condition can rapidly worsen afterward, making it easy to miss the golden window for treatment.
4. Xiphoid process of the sternum
Located behind the inverted triangle cartilage at the junction of the two rows of ribs at the very bottom of the chest cavity, adjacent to the lower edge of the heart and the left lobe of the liver. Heavy external blows can cause internal organ damage and internal bleeding, with high concealment and extremely dangerous.
5. Anterior neck region
Located in the superficial area between the chin and the laryngeal prominence, with no bones on the surface, protected by posterior muscles that prevent breathing, supplying blood and important nerve pathways. Once subjected to external trauma, it poses a great threat to life.
Disclaimer: The above content is from detective novels and is for scientific education and self-defense purposes only.