lamina


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Related to lamina: Laminin, Nuclear lamina

lamina

 [lam´ĭ-nah] (L.)
1. a thin, flat plate or stratum of a composite structure; called also layer.
basal lamina (lamina basa´lis) the layer of the basement membrane lying next to the basal surface of the adjoining cell layer composed of an electron-dense lamina densa and an electron-lucent lamina lucida.
lamina basila´ris the posterior wall of the cochlear duct, separating it from the scala tympani.
lamina choroidocapilla´ris the inner layer of the choroid, composed of a single-layered network of small capillaries.
lamina cribro´sa
2. (of ethmoid bone) the horizontal plate of ethmoid bone forming the roof of the nasal cavity, and perforated by many foramina for passage of olfactory nerves.
3. (of sclera) the perforated part of the sclera through which pass the axons of the retinal ganglion cells.
lamina den´sa an electron-dense layer of the basal lamina, consisting mainly of collagen fibrils and proteoglycans; it closely follows the plasma membrane of the basal aspect of the adjacent cell layer, from which it is separated by the lamina lucida (or the lamina rara in the renal glomerulus and pulmonary alveolus).
lamina du´ra a layer of the alveolar bone that is thin and particularly compact and appears as a line on dental x-rays. Called also bundle bone.
epithelial lamina the layer of ependymal cells covering the choroid plexus.
lamina fus´ca the pigmentary layer of the sclera.
lamina lu´cida an electron-dense layer of the basal lamina lying between the lamina densa and the adjoining cell layer; in the pulmonary alveolus and renal glomerulus it is divided into the internal and external laminae rarae.
lamina pro´pria
1. the connective tissue layer of mucous membrane.
2. the middle fibrous layer of the tympanic membrane.
lamina ra´ra
1. in the renal glomerulus and pulmonary alveolus, one of the layers of lamina lucida surrounding the lamina densa; the lamina rara externa is on the epithelial side and the lamina rara interna is on the endothelial side.
2. a term sometimes used as a synonym for lamina lucida.
reticular lamina a layer of the basement membrane, adjacent to the connective tissue, seen in some epithelia; it is of variable thickness and is composed of condensed connective tissue with a reticulum of collagen fibers.
Rexed's laminae an architectural scheme used to classify the structure of the spinal cord, based on the cytological features of the neurons in different regions of the gray substance. It consists of nine laminae (I–IX) that extend throughout the cord, roughly paralleling the dorsal and ventral columns of the gray substance, and a tenth region (lamina X) that surrounds the central canal and consists of the dorsal and ventral commissures and the central gelatinous substance.
spiral lamina (lamina spira´lis)
1. a double plate of bone winding spirally around the modiolus, dividing the spiral canal of the cochlea into the scala tympani and scala vestibuli.
2. a bony projection on the outer wall of the cochlea in the lower part of the first turn.
terminal lamina of hypothalamus the thin plate derived from the telencephalon, forming the anterior wall of the third ventricle of the cerebrum.
vertebral lamina (lamina of vertebral arch) either of the pair of broad plates of bone flaring out from the pedicles of the vertebral arches and fusing together at the midline to complete the dorsal part of the arch and provide a base for the spinous process of the vertebra.

plate

(plāt),
1. anatomy a thin, relatively flat, structure. Synonym(s): lamina [TA]
2. A metal bar perforated for screws applied to a fractured bone to maintain the ends in apposition.
3. The agar layer within a Petri dish or similar vessel.
4. To form a thin layer of a bacterial culture by streaking it on the surface of an agar plate (usually within a Petri dish) to isolate individual organisms from which a colonial clone will develop.
5. Any of the horizontal perforated plates that make up the fractionating component of a column in fractional distillation (or, the theoretic equivalent of such a plate).
[O.Fr. plat, a flat object, fr. G. platys, flat, broad]

lamina

(lăm′ə-nə)
n. pl. lami·nae (-nē′) or lami·nas
1. A thin plate, sheet, or layer.
2. A thin layer of bone, membrane, or other tissue.
3. Zoology A thin scalelike or platelike structure, as one of the thin layers of sensitive vascular tissue in the hoof of a horse.
4. Cytology A thin layer inside the nuclear membrane of cell that is composed of a meshlike network of protein fibers.

lam′i·nar, lam′i·nal adj.

lam·i·na

, pl. laminae (lam'i-nă, -nē) [TA]
Thin plate or flat layer.
See also: layer, stratum
[L]

lamina

Any thin sheet or layer of tissue, especially the flat surfaces on the arch of a vertebra.

lamina

(pl. laminae) a thin, flat structure such as a leaf or petal, or flat bony element covering the posterior part (roof) of the SPINAL CANAL, a part of the VERTEBRA. See also BASAL LAMINA, RETICULAR LAMINA.

lamina

Thin sheet or layer. Example: the lamina vitrea of Bruch's membrane.

stra·tum

, pl. strata (strā'tŭm, -tă)
One of the layers of differentiated tissue, the aggregate of which forms any given structure.

lay·er

(lā'ĕr) [TA]
A sheet of one substance's lying on another and distinguishable from it by a difference in texture or color or by not being continuous with it.
See also: stratum, lamina

plate

(plāt)
1. [TA] In anatomy, thin, relatively flat, structure.
Synonym(s): lamina [TA] .
2. A metal bar perforated for screws applied to a fractured bone to maintain the ends in apposition.
3. Agar layer within a Petri dish or similar vessel.
4. To form a thin layer of a bacterial culture by streaking it on the surface of an agar plate (usually within a Petri dish) to isolate individual organisms from which a colonial clone will develop.
[O.Fr. plat, a flat object, fr. G. platys, flat, broad]
References in periodicals archive ?
El tipo de lamina utilizada en el nuevo diseno fue M4 de 0,27 mm; el peso original del nucleo era 34542 kg y con laminas nuevas fue de 35947 kg; la seccion transversal de las columnas se conservo con respecto al diseno original.
Para caracterizacao das propriedades fisico-mecanicas, foram selecionados aleatoriamente 3 paineis de 15 mm compostos por 5 laminas. O PNQM utiliza como base para avaliacao das propriedades fisico-mecanicas as normas europeias.
After the arytenoid cartilage was separated from the cricoid cartilage in the left side, the exoeSL procedure with lower needle at lower edge of thyroid lamina 20 mm from the posterior edge of the thyroid lamina and upper needle at 22 mm from the posterior edge produced a sufficient glottic gap [Figure 3]B.
Peciolos, raquis y laminas pilosos, con tricomas uncinulados conspicuos; laminas con la base abrupta o subabruptamente reducida; peciolos de 1/4-1/2 de la longitud de las frondes....4
No periodo entre 10 a 30 dias, para o tratamento sem reducao foliar, a lamina de 2,19 mm [dia.sup.-1] (T2) foi superior aos demais, enquanto para o tratamento com reducao foliar a lamina de 2,92 mm [dia.sup.-1] (T3) possuiu a maior media (Figura 3).
La MB es responsable de la union de las laminas dermica, epidermica y, consecuentemente, de soportar todo el peso corporal.
Type K is a laminated column with the outer layer of Type F morphologically reinforced with JL-L or DF-L lamina 35 mm thick (i.e., KJL, K.DF).
El costo en el mercado de ripio se encuentra alrededor de $2000 Kg seco, la lamina se encuentra alrededor de $4000 Kg, mientras que el latex esta alrededor de $1200 Kg; con la aplicacion de un anticoagulante se redujo en un 38 % la produccion de ripio que tiene un costo de inversion de aplicar 2 [cm.sup.3] de anticoagulante en taza es de $8 pesos con amoniaco, $1.5 pesos con borax y $5.25 pesos un combinado de estos anticoagulantes.
Lamina propria contained many tubular glands which were the protruding lamellae of the glandular cells making elongated crypts.
A partir de los resultados se elaboro un catalogo monografico (Nagel, 2008) que permitiese visualizar la coleccion por completo, dedicando una pagina entera a cada lamina y su ficha correspondiente.
Peciolo 1-2 cm largo, hirsuto; lamina oblonga a eliptica, rara vez ovada, 8-14 x 4,5-7,0 cm, base casi truncada o muy levemente cordada y entonces con escotaduras hasta de 5 mm profundo, lobulos paralelos a convergentes, apice agudo, venas primarias basales 3(5), haz esparcidamente hirsuta, enves densamente puberulo a lo largo de la venacion, venas secundarias y terciarias formando un reticulo denso.
The lamina of the C2 is reported to be the largest in the cervical spine and is often used during translaminar fixation to correct atlantoaxial or occipitocervical instability [1, 2].