Lamella

Lamella
A thin leaf, plate, disk, wafer.
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1. [TA] A thin sheet or layer (such as occurs in compact bone) or sublayer. 2. A preparation in the form of a medicated gelatin disk, used as a means of making local applications to the conjunctiva in place of solutions. SYN: discus [TA], disk (2) [TA]. [L. dim. of lamina, plate, leaf]
- annulate lamellae several pairs of parallel, smooth membranes, each pair containing regularly spaced pores resembling those of the nuclear envelope; they occur in germ cells, embryonic cells, and neoplastic cells.
- articular l. the compact layer of bone on its articular surface that is firmly attached to the overlying articular cartilage.
- l. of bone a concentric, circumferential, or interstitial l..
- circumferential l. a bony l. that encircles the outer or inner surface of a bone.
- concentric l. one of the concentric tubular layers of bone surrounding the central canal in an osteon. SYN: haversian l..
- cornoid l. a narrow vertical column of parakeratosis in the epidermal stratum corneum; characteristic of porokeratosis.
- elastic l. a thin sheet or membrane composed of elastic fibers; distinguished from elastic membrane, which usually refers to a condensed mass of fibers, as in an artery, whereas an elastic l. may be a looser elastic layer such as found in a vein or the respiratory tract.
- enamel l. an organic defect in enamel; a thin, leaflike structure that extends from the enamel surface toward the dentinoenamel junction.
- glandulopreputial l. a layer of embryonic epithelial tissue that gives rise to the prepuce.
- ground l. SYN: interstitial l..
- haversian l. SYN: concentric l..
- interstitial l. one of the lamellae of partially resorbed osteons occurring between newer, complete osteons. SYN: ground l., intermediary system, intermediate l..
- triangular l. SYN: tela choroidea of third ventricle.
- l. tympanica (laminae spiralis ossei) [TA] SYN: tympanic l. (of osseous spiral lamina).
- tympanic l. (of osseous spiral lamina) [TA] the thinner of two plates of bone, incompletely separated from each other by canals for peripheral fibers from the spiral (cochlear) ganglion, that together comprise the osseous spiral lamina; this plate lies on the side of the scala tympani, forming a portion of its wall. SYN: l. tympanica (laminae spiralis ossei) [TA].
- l. vestibularis (laminae spiralis ossei) [TA] SYN: vestibular l. (of osseous spiral lamina).
- vestibular l. (of osseous spiral lamina) [TA] the thicker of two plates of bone, incompletely separated from each other by canals for peripheral fibers from the spiral (cochlear) ganglion, that together comprise the osseous spiral lamina; this plate lies on the side of the scala vestibuli; a thickening of the periosteum, the spiral limbus, is attached to the vestibular l. within the cochlear duct. SYN: l. vestibularis (laminae spiralis ossei) [TA].
- vitreous l. SYN: lamina basalis choroideae.

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la·mel·la lə-'mel-ə n, pl la·mel·lae -'me-.lē, -.lī also lamellas
1) an organ, process, or part resembling a plate: as
a) one of the bony concentric layers surrounding the haversian canals in bone
b ) (1) one of the incremental layers of cementum laid down in a tooth (2) a thin sheetlike organic structure in the enamel of a tooth extending inward from a surface crack
2) a small medicated disk prepared from gelatin and glycerin for use esp. in the eyes <lamellae of atropine>

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n. (pl. lamellae)
1. a thin layer, membrane, scale, or plate-like tissue or part. In bone tissue, lamellae are thin bands of calcified matrix arranged concentrically around a Haversian canal.
2. a thin gelatinous medicated disc used to apply drugs to the eye. The disc is placed on the eyeball; the gelatinous material dissolves and the drug is absorbed.

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la·mel·la (lə-melґə) gen. and pl. lamelґlae [L., dim. of lamina] 1. a thin leaf or plate, as of bone. 2. a medicated disk or wafer prepared from gelatin, glycerin, and distilled water, and containing a small quantity of an alkaloid, to be inserted under the eyelid. 3. gill (def. 2).

Medical dictionary. 2011.

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  • Lamella — is a term for a platelike structure, appearing in multiples, that occurs in various situations, such as biology or materials sciences. It implies a thin layer (Latin), the same derivation as for laminate . It can mean:*Lamella (zoology), a… …   Wikipedia

  • Lamella — La*mel la, n.; pl. L. {Lamell[ae]}, E. {Lamellas}. [L. lamella, dim. of lamina plate, leaf, layer: cf. F. lamelle. Cf. {Lamina}, {Omelet}.] a thin plate or scale of anything, as a thin scale growing from the petals of certain flowers; or one of… …   The Collaborative International Dictionary of English

  • lamella — /la mɛl:a/ s.f. [dal lat. lamella, dim. di lamĭna lamina ]. [sottile porzione di metallo o d altro] ▶◀ [➨ lamina (1. a)] …   Enciclopedia Italiana

  • lamella — [lə mel′ə] n. pl. lamellae [lə mel′ē] or lamellas [L, dim. of lamina: see LAMINA] a thin, platelike part, layer, organ, or structure; specif., a) one of the layers of bone around a Haversian canal b) one of the two plates forming a gill in… …   English World dictionary

  • lamella — lamella. См. ламелла. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • lamella — A broad, flattened appendage [Wilson, 1989]. Thin flat plate or scale. (Pl. lamellae) [Butler, T.H.]. (Subclass Cirripedia): Barnacle plate feature: in unstalked form, outer and inner walls of paries and radius. Separated by longitudinal septa… …   Crustacea glossary

  • lamella — la·mèl·la s.f. 1. CO lamina sottile di metallo o altro materiale solido: lamella d acciaio, di osso, di plastica 2. TS biol. strato sottile di un tessuto cellulare animale o vegetale 3. TS bot. nei funghi di alcune famiglie di Imenomiceti,… …   Dizionario italiano

  • lamella — n.; pl. ae [L. lamella, small plate] 1. A thin plate or leaflike structure. 2. (ARTHROPODA: Chelicerata) A triangular plate on the promargin of the cheliceral fang furrow in some spiders. 3. (MOLLUSCA: Gastropoda) Flared axial projection of the… …   Dictionary of invertebrate zoology

  • lamella — /leuh mel euh/, n., pl. lamellae / mel ee/, lamellas. 1. a thin plate, scale, membrane, or layer, as of bone, tissue, or cell walls. 2. Bot. a. an erect scale or blade inserted at the junction of the claw and limb in some corollas and forming a… …   Universalium

  • lamella — {{hw}}{{lamella}}{{/hw}}s. f. 1 Sottile lamina di qualsiasi materiale: lamella metallica. 2 (biol.) Sottile tessuto cellulare animale o vegetale | Ognuna delle ripiegature della parte inferiore del cappello in alcune specie di funghi a grande… …   Enciclopedia di italiano

  • lamella — la•mel•la [[t]ləˈmɛl ə[/t]] n. pl. mel•lae [[t] ˈmɛl i[/t]] mel•las bio frm a thin plate, scale, membrane, or layer, as a scale of horny tissue or a mushroom gill • Etymology: 1670–80; < L lāmella, dim. of lāmina lamina …   From formal English to slang

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