How many nerves does the human body have

I believe many people know that there are many nerves distributed in their bodies, and basically every nerve is connected to each other, so when there is a problem with one of the nerves, it will affect the normal function of other nerves. Moreover, each nerve in the human body plays a different role. Of course, it is very easy to have nervous system disorders as we age. How many nerves are there in the human body?

1. How many nerves does the human body have?

The human body mainly has 12 pairs of cranial nerves: olfactory nerve, optic nerve, oculomotor nerve, trochlear nerve, trigeminal nerve, abducens nerve, facial nerve, auditory nerve, glossopharyngeal nerve, vagus nerve, accessory nerve, hypoglossal nerve and peripheral nerves.

2. Classification of the nervous system

The human nervous system is divided into two main parts: the central nervous system and the peripheral nervous system.

3. Classification of Central Nervous System

The central nervous system includes the brain in the cranial cavity and the spinal cord in the spinal canal. 2. Peripheral nerves: These are the nerve components outside the brain and spinal cord, including cranial nerves, spinal nerves and visceral nerves (also called autonomic nerves or plant nerves). The brain, spinal nerves and visceral nerves each contain sensory and motor components.

1. Cranial nerves: 12 pairs in total.

2. Spinal nerves: 31 pairs in total.

3. Visceral nerves: refers to the nerves that control the internal organs, cardiovascular system, smooth muscles and glands. The components of these nerves are divided into sympathetic nerves and parasympathetic nerves. Corresponding to the name visceral nerves, all nerves that control the body surface, bones, joints and skeletal muscles can also be collectively referred to as somatic nerves.

4. Symptoms of Neurasthenia

When neurasthenia occurs, the inhibition process in the brain weakens, the excitability of nerve cells increases relatively, and they can produce strong and rapid responses to external stimuli, thereby consuming a large amount of energy in nerve cells. Therefore, patients with neurasthenia often show symptoms of being easily excited and easily fatigued. On the other hand, the function of the cerebral cortex is weakened, and its function of regulating and controlling the subcortical autonomic nervous system is also weakened, resulting in some symptoms of autonomic hyperfunction.