onion bulb

onion bulb
in neuropathology, a collection of overlapping Schwann cells resembling the bulb of an onion, encircling an axon that has become demyelinated; seen in progressive hypertrophic neuropathy and similar conditions that are characterized by repeated demyelination and remyelination.

Onion bulbs in a cross-section of a sural nerve in a form of Charcot-Marie-Tooth disease.


Medical dictionary. 2011.

Look at other dictionaries:

  • Onion — Onions redirects here. For the name and those bearing it, see Onions (surname). This article is about the plants. For other uses, see Onion (disambiguation). Onion Onions Scientific classification …   Wikipedia

  • onion set — noun a small onion bulb planted instead of seed to yield a mature bulb …   English new terms dictionary

  • onion set — noun : a small onion bulb planted in the spring to produce an early crop especially of green onions …   Useful english dictionary

  • bulb — (n.) 1560s, an onion, from M.Fr. bulbe, from L. bulbus bulb, onion, from Gk. bolbos plant with round swelling on underground stem. Expanded by 1800 to swelling in a glass tube (thermometer bulb, light bulb, etc.) …   Etymology dictionary

  • Bulb — (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and producing …   The Collaborative International Dictionary of English

  • Bulb of a hair — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and …   The Collaborative International Dictionary of English

  • Bulb of a tooth — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and …   The Collaborative International Dictionary of English

  • Bulb of the eye — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and …   The Collaborative International Dictionary of English

  • Bulb of the spinal cord — Bulb Bulb (b[u^]lb), n. [L. bulbus, Gr. bolbo s: cf. F. bulbe.] 1. (Bot.) A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and …   The Collaborative International Dictionary of English

  • Onion — On ion, n. [F. ognon, fr. L. unio oneness, unity, a single large pearl, an onion. See {One}, {Union}.] 1. (Bot.) A liliaceous plant of the genus {Allium} ({Allium cepa}), having a strong flavored bulb and long hollow leaves; also, its bulbous… …   The Collaborative International Dictionary of English

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