👉 The term "extranuclear" is a medical term that refers to the region of the brain that contains cells from two or more different nuclei, such as the hypothalamus and pituitary gland. This can occur in patients with multiple sclerosis (MS), where the same neuron cell type is distributed throughout multiple regions of the brain. The specific location of extranuclear neurons is not well-defined but it has been observed in various human populations. It is important to note that this term may be