Parietal lobe: between frontal lobe, temporal lobe and occipital lobe. Include central posterior gyrus, parietal superior gyrus and parietal inferior gyrus. The parietal lobe of the brain is mainly composed of cortex, which senses and monitors the responses of various parts of the body to external stimuli. Because of its special position, the sensory joint area of the parietal lobe can integrate a variety of sensory information and speech, and the damage in this area will lead to writing and reading disorders.
The speech center located in the parietal lobe is the angular gyrus, which is responsible for the conversion between auditory phonetic information and visual text information. So people can write down what they hear and see. When the angular gyrus is damaged, the patient loses the connection between the auditory perception of speech and the visual perception of words, and cannot convert the written language into an understandable phonetic form.
Extended data:
The parietal lobe injury produces mental body image disorder, that is, self-spatial agnosia. Clinically, there are the following manifestations:
(1), limb agnosia: cerebral infarction in the superior parietal gyrus had left hemiplegia, but the patient denied that the left paralyzed limb was not his own, which is a negative body image disorder.
(2) Phantom limb: Phantom limb refers to the third phantom limb in left hemiplegia, which is a positive body image disorder.
(3) Pain agnosia: Pain agnosia refers to not knowing the pain stimulus, and the actual pain exists. For example, there is no pain response when cigarettes burn fingers, and there is no protective reflex when discarding cigarette butts. Lesions are rare in the left superior marginal gyrus, involving some angular gyrus and superior temporal gyrus.
(4): face blindness: face blindness means not knowing an acquaintance, or even his own face in the mirror. Often accompanied by color, object and orientation agnosia, it is a rare symptom of occipital injury.
Reference source: Baidu Encyclopedia-Top Leaf