What Is the Dentate Gyrus?

The dentate gyrus is part of the hippocampal structure. It is a narrow strip of gray matter with horizontal grooves on its inner edge to divide into zigzags. This time it is located between the hippocampal umbrella and the hippocampal umbrella. Its rear end is separated from the hippocampal umbrella and migrates in the bundle-shaped gyrus. This horizontal band is the dentate gyrus, which divides the hippocampal ditch into two parts: the front is called the ditch, and the back is called the inner margin.

The dentate gyrus is part of the hippocampal structure. It is a narrow strip of gray matter with horizontal grooves on its inner edge to divide into zigzags. This time it is located between the hippocampal umbrella and the hippocampal umbrella. Its rear end is separated from the hippocampal umbrella and migrates in the bundled gyrus. Its front end reaches the recess of the hippocampal groove and bends inward at an acute angle. It crosses the underside of the hippocampal groove. This horizontal band is the dentate gyrus, which divides the hippocampal ditch into two parts: the front is called the ditch, and the back is called the inner margin.

Chinese name

Dentate gyrus

Foreign name

Dentate gyrus

Anatomy of the dentate gyrus :

1 Toothed gyrus 1, hippocampal structure:

The hippocampal structure belongs to the cortex of the olfactory system. During the embryonic period, the coastal horse fissure is attached to the inner wall of the hemisphere, above the choroid fissure. With the formation of the temporal lobe, the hippocampal fissure and choroid fissure are squeezed down and forward. The arched hippocampal structure develops unevenly. Due to the invasion of the corpus callosum fibers, the part of the hippocampal structure above the corpus callosus rarely differentiates, forming a gray The upper part of the carcass is not affected by the carcass, and develops into the main part of the hippocampal structure, that is, the hippocampus trapped in the bottom of the lateral ventricle, the dentate gyrus on both sides of the hippocampus and the adjacent hippocampus. The hippocampus goes back and becomes a subiculum. The hippocampal structure is an important part of the limbic system, and it is also a high-profile area in modern epilepsy research. Some people think that the hippocampal structure is similar to an amplifier of epilepsy-like activity. A large number of experimental and clinical studies have found that hippocampal sclerosis, or medial temporal sclerosis, is closely related to temporal lobe seizures. In addition, the relationship between intractable epilepsy associated with low-grade malignant astrocytoma and loss of hippocampal neurons has been confirmed and confirmed by pathological studies. Although the causal relationship between epilepsy and hippocampal structural sclerosis is uncertain, it is generally believed that the two interact and affect each other. Hippocampal sclerosis is the basis of "epilepsy maturity". Different surgical methods designed by clinicians based on the structural characteristics of the hippocampus have achieved satisfactory results in controlling epilepsy.

The hippocampal structure is anterior and posterior, occupying the inner and lower parts of the temporal lobe, protruding from the medial side of the lateral ventricle at the base of the temporal angle of the lateral ventricle. The naming and differentiation of hippocampal structures has not yet been unified. It is usually divided from the outside to the inside (or from the bottom to the top) into the hippocampal gyrus, under the hippocampus, hippocampus, dentate gyrus (corner of hippocampus), chamber bed and hippocampus. The hippocampus is formed by several small cerebral gyruses that curl inwardly to cover the hippocampal sulcus. It is named after the appearance of the hippocampus, and the hippocampus seen when the temporal angle of the lateral ventricle is opened looks more like a silkworm or sheep's horn. The hippocampus is a hippocampus; the hippocampus is about 5cm long, and the hippocampus is slightly bent inward, connecting with the amygdaloid nucleus straddling the tip of the temporal angle of the lateral ventricle. The ventricular bed is a glittering white matter layer spreading on the ventricular surface of the hippocampus. This layer of white matter extends backward to form a hippocampal umbrella, which further extends inward and backward to form a dome.

2 Dentate gyrus 2, brain:

The brain is mainly composed of left and right hemispheres. There are corpus callosum and other connections between the two hemispheres of the brain, forming a unified whole and function. Each cerebral hemisphere mainly includes: (1) cerebral cortex: is a layer of gray matter on the surface of the brain, which is a concentrated part of the nerve cell body, and has many concave grooves (fissures) and protruding gyruses. (2) White matter of the brain: Also known as the medulla, inside the cortex, it is composed of nerve fibers. It contains fibers that connect the two hemispheres of the brain and connect the brain with the brain stem and spinal cord. (3) Basal ganglia: In the white matter at the bottom of the cerebral hemisphere, neural cell bodies are concentrated. The most important is the striatum. Its function is to assist the cerebral cortex to regulate the movement of the body. The human brain is the most developed major part of the central nervous system.

The brain is the main and advanced parts of the brain and the main organ for mental activity. The brain weighs 80% of the whole brain. Consists of left and right brain hemispheres. The cerebral hemisphere includes: the gray matter layer on the surface of the brain, that is, the cerebral cortex, which is the concentrated part of the nerve cell body, and becomes the center of advanced neural activity; the white matter in the deep layer of the cerebral cortex, also known as the medulla; The basal ganglia formed by the concentration of nerve cells has the function of assisting the cerebral cortex to regulate body movements. When a person's brain is damaged, there will be some kind of obstacle in mental activity. It is clinically found that if the central anterior gyrus of the left hemisphere of the brain is damaged, it may lead to "motor aphasia". Although the patient's vocal organs are normal, he can understand other people's conversation, but he cannot speak, and can not express his thoughts in oral language. If the part of the back of the middle frontal gyrus that is close to the representative area of the central anterior gyrus is damaged, it will cause "dyslexia". The patient can understand, understand and speak, but cannot write. In addition, damage to the posterior superior temporal gyrus of the brain can lead to "sensory aphasia," which enables patients to understand words but not understand others' conversations. Damage to the horns of the brain can lead to "dyslexia". The patient has good vision but cannot understand the meaning of the text.