Medicina china tradicional

The callous body is a nervous fiber beam of Axone S i.e. of the white substance of the Cerveau,

In the Mammalian brain of the S, the callous body forms most of the white Matière and seems a broad structure and punt right in lower part of the Cortex.
Il is made up almost exclusively of beams of Axone S (+ of 200 million) which connect the two cerebral hemispheres.
C' is the most important commissure of the brain because it connects the 4 lobes of the brain between them (lobes frontal, temporal, parietal and occipital left and right). The callous body thus ensures the transfer inter hemispherical information.
La greater part, but certainly not totality, of the communications taking place between the two hemispheres of the brain forward by the callous body.

The callous body thus consists of transverse white fibers which extend from one cerebral hemisphere to another. One can delimit four structures. The knee and the 1 3 former of the callous body (or Rostrum) are thus formed by the fibers which link the two frontal cortices; 1/3 means (or Trunk) by the fibers which link the parietal and temporal cortices, the posterior part or splénium by the fibers which link the two occipital cortices. Thus, thanks to the callous body, the messages coming from a way related, unilateral, will have a bilateral termination on the two symmetrical surfaces and this duplication of the message plays certainly a big role in the transfer of one hemisphere to the other of perceptive and driving acquisitions. Lesions of the callous body during various pathological processes (callous sterility, patient Split-brain, syndrome of Marchiava-Bigniami…) for consequence a cerebral disconnection at the origin of a asynergie between the two hemispheres will have known under the name of syndrome of callous disconnection. The clinical signs of this syndrome thus largely will depend on the localization of the lesion on the callous body. For example, a lesion on the level of splénium will involve a visual saddle-oyster and a left unilateral word blindness (incapacity to name objects or letters projected in the visual fields left). Whereas a lesion on the level of the knee causes an apraxia idéo driving left (incapacity to carry out a symbolic gesture such as a military salute on order or intentionally with the left hand). These examples highlight well all the importance of the callous body and the inter-hemispherical transfer.

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