![]() ![]() While the neural crest is responsible for the development of the peripheral nervous system. The neural tube is responsible for developing the central nervous system. It is the neural plate that will further differentiate into the neural tube and the neural crest cells. In the beginning, the notochord is beneath the ectoderm and induces the ectoderm to differentiate into the neuroectoderm and the neural plate. This sensory map is what the sensory homunculus illustrates.ĭuring embryology, the nervous system is developed from the ectodermal germ layer. The final destination of the sensory impulses is along the postcentral gyrus. The thalamus processes all these sensory impulses, and then the thalamus will send it to the cerebral cortex. ![]() While the trigeminal nerve carries the face's sensations. The impulses from the body will be sent into the spinal cord and eventually back to the brain to be processed. The sensory homunculus is a map along the cerebral cortex of where each part of the body is processed. The inferolateral region of the postcentral gyrus corresponds to the facial and bulbar structures. Interestingly, the face is the structure that takes up the most area of the sensory homunculus. While along the lateral side of the postcentral gyrus, this region corresponds to the upper extremity and hand. Moving more laterally along the postcentral gyrus, the superior to superolateral regions of the gyrus corresponds to the neck, shoulder, and torso. Starting from the medial aspect of the postcentral gyrus, this area corresponds to the sensory territory of the genitals and lower extremities. The topography of the sensory homunculus corresponds to the contralateral side of the body. This topograph usually has body parts illustrated along the surface of the postcentral gyrus of the parietal lobe. The sensory homunculus is a topographic representation of the sensory distribution of the body found in the cerebral cortex. ![]()
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