Xiao Li came home after working overtime in the company, just out of the building door to hear a “thud” overhead, a car keys fell on the cement next to the ground, thinking who is going to borrow my car to drive? I just had to look down to pick it up and felt something was wrong, and my scalp was on fire. The buddy who was going to pick up the keys downstairs rushed over: “I’m really sorry, I threw it off upstairs.” This is when Xiao Li woke up bored, thinking “Civil Code” I have learned, this is throwing objects from a height, believe it or not I sue you two. But the buddy in front of him froze and pointed his finger at Xiaoli’s forehead. Xiao Li raised his hand to feel, wet and sticky, look at the hand bright red piece, immediately black. “Eh, buddy hold on ah, I’ll send you to the hospital.” In the twinkling of an eye to the hospital’s emergency department, after doing the relevant checks, the doctor told Xiao Li is not a big deal, is that there is a mouth on the scalp to close a few stitches, wait a few moments brain surgeons came. Now Xiao Li heart muttered: “What? Also need brain surgery? Could it be that my brain is smashed?” Fortunately, the brain surgeon soon came to check the situation of the small Lee after three stitches and bandages finished. The small Li also asked why such a small mouth still needs a professional doctor of brain surgery to deal with. The human head can be divided into many layers, from the outside to the inside roughly including: skin → capillary tendon membrane → periosteum → skull → dura mater → arachnoid → soft meninges → brain tissue. Each layer of tissue has its own characteristics, and has different performance after trauma. The same swollen bag on the head may be a problem at different levels such as skin, capitellum, and periosteum, where a subcapitellar hematoma may even lead to hemorrhagic shock. The skull beneath the scalp may also suffer from linear fractures and depressed fractures due to external forces. A series of injuries may occur within the skull after the injury, such as epidural hematoma, subdural hematoma, subarachnoid hemorrhage, and cerebral contusions. Although Xiao Li was injured by a small key smash, the possibility of skull and intracranial tissue injury cannot be excluded. Therefore, a neurosurgery specialist is needed to make a comprehensive judgment through consultation, physical examination and auxiliary examinations, and then debridement and suturing of the scalp wound after excluding other problems. The scalp is rich in blood vessels, so Xiao Li shed a lot of blood, but the good thing is that the recovery is also fast, about 5 days after the sutures can be removed. So head trauma, or to go to a regular hospital, by a regular doctor, do not take it lightly.