What are the functions of the left temporal lobe?

Once a person's left temporal lobe is diseased, it will lead to a series of symptoms. For example, some people have problems with their left temporal lobe when they are old, which can cause Alzheimer's disease. The patient will lack willpower, memory will be greatly reduced, and appetite will change. In short, problems with the left temporal lobe are very harmful and can cause a series of systemic symptoms. So what role does the left temporal lobe of a person play?

Functions of the left temporal lobe:

The left cerebral hemisphere is closely related to language, consciousness, mathematical analysis, etc. Auditory area: The transverse temporal gyrus (areas 41 and 42) receives fibers from the medial geniculate body. The auditory center on each side receives impulses from both ears. Therefore, damage to the auditory center on one side will not cause total deafness. Motor language center (speech center): the posterior part of the inferior frontal gyrus. If this center is damaged, the patient can make sounds but cannot speak meaningful language. Writing center: the posterior part of the middle frontal gyrus, close to the upper limb representation area of ​​the precentral gyrus, especially the motor area of ​​the hand. If this center is damaged, although the motor function of the hand is still preserved, fine movements such as writing and drawing will be impaired.

Auditory language center: The posterior part of the superior frontal lobe. If this center is damaged, the patient can hear others speak but cannot understand the meaning of the speech, nor can he understand what he himself says. Visual language center (reading center): There is no obvious boundary between the auditory language center and the visual language center. Some scholars call them Wernicke's area, including the superior temporal gyrus, the posterior part of the middle temporal gyrus, the supramarginal gyrus and the angular gyrus. Damage to the Wernicke's area causes severe sensory aphasia.

Areas 41 and 42 of the superior temporal gyrus and the transverse temporal gyrus are the auditory cortex areas. The posterior part of the superior temporal gyrus in the dominant hemisphere is the auditory speech center, called the Wernicke area, which also includes the posterior part of the middle temporal gyrus and the supramarginal gyrus and angular gyrus of the superior parietal lobule. The hook of the hippocampus is the olfactory and taste center. The front part of the temporal lobe is the mental cortex. Human emotions and mental activities are not only related to the orbitofrontal cortex, but also have a lot to do with the temporal lobe. The hippocampus is related to memory.

The head is divided into left and right temporal lobes. The temporal lobe is located on the outer and lower sides of the head, next to the ears and inside the temples. The temporal lobe is located below the sylvian fissure, above the middle cranial fossa and the tentorium cerebelli, with the frontal lobe in front, the parietal lobe above, and the occipital lobe behind. The superior temporal sulcus, middle temporal sulcus and inferior temporal sulcus divide the temporal lobe into the superior temporal gyrus, middle temporal gyrus and inferior temporal gyrus. The tail end of the superior temporal gyrus rolls obliquely into the lateral fissure to form the transverse temporal gyrus. The fusiform gyrus is between the inferior temporal sulcus and the collateral fissure, and the hippocampal gyrus is between the collateral fissure and the hippocampal fissure. The hook of the hippocampal gyrus is located above the tentorium cerebelli, close to the edge of the tentorial notch.