Unmyelinated
Definition
Lacking a myelin sheath; a nerve fiber or axon devoid of the protective, insulating structural lipid layer. Amielinic (unmyelinated) fibers (such as type C fibers) are characterized by a significantly slower nerve impulse conduction velocity compared to myelinated ones, playing an essential functional role in transmitting dull pain sensations, temperature, and regulating autonomic nervous system connections.
Bilingual Equivalents
- Unmyelinated
- Amyelinic
Grammatical & Source Details
| Inflection Type | Variable adjective with standard masculine, feminine, and structural plural variations. |
| Formation | Formed using the prefix 'a-' (without/lacking) combined with the anatomical adjective 'myelnic' relating to myelin. |
| Spelling / Pronunciation | [ˌeɪ.maɪ.ə.ˈlɪn.ɪk] |
| Source | Stedman's Medical Dictionary and Histological Standards |
Contextual Usage Examples
RO: O fibră nervoasă amielinică transmite semnalele cu o viteză de doar zero virgulă cinci până la doi metri pe secundă.
EN: An unmyelinated nerve fiber transmits signals at a velocity of only zero point five to two meters per second.
RO: Examenul histologic a evidențiat o densitate crescută de axoni de tip amielinic în structura nervului periferic analizat.
EN: The histological examination revealed an increased density of unmyelinated axons within the structure of the analyzed peripheral nerve.
RO: Sistemul nervos simpatic utilizează neuroni postganglionari cu structură complet amielinică pentru a inerva organele interne.
EN: The sympathetic nervous system utilizes postganglionic neurons with a completely unmyelinated structure to innervate internal organs.
Idioms & Phrases
Fibră amielinică / Unmyelinated fiber
RO: Axon neuronal înconjurat doar de citoplasma celulei Schwann, fără înfășurarea concentrică densă izolatoare caracteristică mielinei.
EN: A neuronal axon surrounded only by the cytoplasm of the Schwann cell, without the dense, insulating concentric wrapping characteristic of myelin.
Neuropatie a fibrelor amielinice / Small fiber neuropathy
RO: Afecțiune neurologică periferică selectivă ce afectează structura axonilor mici nemielinizați, provocând senzații de arsură și durere cronică.
EN: A selective peripheral neurological disorder affecting the structure of small unmyelinated axons, causing burning sensations and chronic pain.
Conducere amielinică / Continuous conduction
RO: Mecanism fiziologic continuu și lent de propagare a potențialului de acțiune de-a lungul întregii membrane axonale, spre deosebire de conducerea saltatorie.
EN: A continuous and slow physiological mechanism of action potential propagation along the entire axonal membrane, as opposed to saltatory conduction.
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