What is the effect of sympathetic nerve excitement in the head

You may not be very familiar with the sympathetic nerves of the head, and may not even have heard of its name, nor do you know what it is. Here, I would like to introduce to you that the sympathetic nerves of the head are part of the autonomic nerves of the human body. They mainly ensure the physiological needs of the human body when it is in a state of tension, such as accelerated heartbeat, dilated pupils, etc. Below, the editor will also introduce to you the main functions of sympathetic nerve excitement in the head.

1. Effect on the circulatory system: The blood vessels of the skin, striated muscles and abdominal organs are only controlled by the sympathetic nerves, while the blood vessels of the coronary circulation and cerebral circulation receive both sympathetic and parasympathetic nerve fibers. Therefore, stimulation of the sympathetic nerves can generally cause the peripheral arteries to contract, while removal of the sympathetic nerves can cause the peripheral arteries to dilate. The treatment of peripheral vascular disease and sympathectomy are based on this.

2. Effect on the digestive system: The sympathetic nerves mainly inhibit the gastrointestinal tract, slowing down peristalsis. However, when the gastrointestinal tone is too low or inactive, the sympathetic nerve impulses can increase and excite it. The effect of the sympathetic nerves on the secretory function of the digestive glands is quite inconsistent. Although they can promote the secretion of the pancreas and salivary glands, the secretion is not obvious due to the contraction of blood vessels in this area, while they prevent the secretion of gastric juice.

3. Effect on the respiratory system: When the sympathetic nerves are excited, the activity of the smooth muscles of the small bronchi is mainly inhibited, thereby expanding the small bronchi and allowing air to flow in and out smoothly. This is why asthma patients get temporary relief after injections of preparations such as ephedrine.

4. Effect on the urinary system: The action of the sympathetic nerves can relax the bladder wall and contract the internal sphincter, thereby preventing urine from being discharged. In addition, in the reproductive system, it has a regulatory effect on the smooth muscles of the female uterus and the smooth muscles of the male ejaculatory ducts and seminal vesicles.

I believe that after reading the above content, you will have a preliminary understanding of the sympathetic nerve excitement of the head, and understand what role it plays in the human body. If you want to know more about the specific content of the sympathetic nerve excitement of the head, you can come to consult the editor. Finally, the editor wishes you all good health.