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non-medullated
non-medullated adj. 
/ˌnɒnmᵻˈdʌleɪtᵻd/, /ˌnɑnˈmɛdəˌleɪdᵻd/, /ˌnɑnˈmɛdʒəˌleɪdᵻd/ Anatomy and Zoology not having a myelin (medullary) sheath, unmyelinated; (also) not having a medulla.
Brit. /ˌnɒnmɛˈdʌleɪtᵻd/
, /ˌnɒnmɛˈdʌleɪtᵻd//ˌnɒnmᵻˈdʌleɪtᵻd/U.S. /ˌnɑnməˈdəˌleɪdᵻd/
, /ˌnɑnməˈdəˌleɪdᵻd//ˌnɑnˈmɛdəˌleɪdᵻd//ˌnɑnˈmɛdʒəˌleɪdᵻd/ΚΠ
1862 Proc. Royal Soc. 12 76 Non-medullated terminal fibres.
1881 J. Ross Treat. Dis. Nerv. Syst. I. i. i. 23 A fatty material of a very special character accumulates in the interior of the protoplasm..in order to account for the development of the medullated from the non-medullated fibres.
1949 J. B. Speakman in J. M. Preston Fibre Sci. xvi. 277 Turning..to non-medullated fibres, Chamberlain found that the sulphur content of human hair, which had been descaled..was identical with that of the original untreated hair.
1997 R. Porter Greatest Benefit to Mankind xvii. 535 He found sympathetic nerve fibres were grey because they were non-medullated, and nerve axons were continuous with nerve cells in the spinal cord.
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