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(dôr′sĭ-vĕn′trəl) or


1. Botany Flattened and having distinct upper and lower surfaces, as most leaves do.
2. Biology Extending from a dorsal to a ventral surface: dorsiventral muscles.

dor′si·ven′tral·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
References in periodicals archive ?
Leaf anatomical characters which contributed to most of the differences in the ten Plectranthus investigated included epidermal cell type which was sinuous or polygonal (Figures 3 and 4), trichome type which ranged from being long-stalked, short-stalked, glandular, and nonglandular to capitate (Figure 5), the nature of the leaf mesophyll which was either homogenous or dorsiventral, and the nature of the palisade layer (Figures 3 and 4).
The dorsiventral anatomy of the blade was observed to have a polygonal arrangement of spongy tissue consisting of typical aerenchyma, and the adaxial region of the mesophyll was occupied by homogeneous palisade parenchyma interrupted by ample substomatal chambers.
Simetria dorsiventral. Superficie coliculada, formada por celulas poligonales, que se hacen rectangulares u oblongas sobre la quilla ventral, en las proximidades del eleosoma y en los margenes apicales, con paredes radiales no visibles y tangencial externa lisa, a veces levemente estriada y normalmente convexa (Fig.
Simetria dorsiventral. Superficie levemente reticulada, formada por celulas poligonales, de paredes radiales superficiales y tangencial externa de lisa a levemente estriada, separadas por pliegues irregulares (Fig.
Mesophyll was dorsiventral, with only one layer of palisade parenchyma.
Hypostomatic leaves, paracytic stomata, straight-walled epidermal cells, dorsiventral mesophyll and the collateral vascular system are usual characters of Rubiaceae family (Solereder, 1908; Metcalfe & Chalk, 1950).
They are usually prostrate, with a dorsiventral thallus, 20-50 x 0.80-1.20 mm, without hairs; section of thallus shows the lamina and the border unistratose throughout; border cells have thickened walls, clearly distinct from the rest of the lamina, and single spines, 15-35 [micron]m long; the spines are sparsely distributed along the marginal cells.
As seccoes transversais da lamina foliar do biribazeiro indicam organizacao dorsiventral das folhas, que sao do tipo hipoestomatica, com tricomas em ambas as faces (Figura 3).