nerve sheath
(nerv sheeth)
The tissue that covers and protects the nerves that are outside the brain and spinal cord. The nerve sheath is made up of connective tissue and myelin (a substance that contains protein and fat).
The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.
Updates regarding government operating status and resumption of normal operations can be found at opm.gov.