where is the myelin sheath located on a neuron
Myelin Myelin is a fatty white substance that surrounds the axon of some nerve cells, forming an electrically insulating layer. It is essential for the proper functioning of the nervous system. It is an outgrowth of a type of glial cell.
Hypoglossal nerve The hypoglossal nerve arises as a number of small rootlets from the front of the medulla, the bottom part of the brainstem,[1][2] in the preolivary sulcus, which separates the olive and the pyramid.[3] The nerve passes through the subarachnoid space and pierces the dura mater near the hypoglossal canal, an opening in the occipital bone of the skull.[2][4]