Bilateral Symmetry


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bilateral symmetry

[bī′lad·ə·rəl ′sim·ə·trē]
(biology)
Symmetry such that the body can be divided by one median, or sagittal, dorsoventral plane into equivalent right and left halves, each a mirror image of the other.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

bilateral symmetry

A balanced arrangement of identical similar elements about a central axis.
See also: Symmetry
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Bilateral Symmetry

 

two-sided symmetry in organisms; manifested in the fact that the body is divided by a medial plane into right and left halves, each of which is the mirror image of the other. Bilateral symmetry occurs among worms, arthropods, and vertebrates and also plant organs—for example, many stems with leaves or lateral shoots arranged in two rows, stems of many cacti, and so on. Leaves in which the upper and lower surfaces differ in structure are also called bilateral.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Nevertheless, our study does have three distinct positive features: (1) the specimens represented the size extremes of mastoid pneumatization in 41 clinically ear-normal crania, (2) images of the stapes were obtained in situ, and thus any possible damage sustained during harvesting was precluded, and (3) bilateral symmetry of stapes features was checked.
Disp and CGDI both in mean values and ranges between right and left sides, suggesting bilateral symmetry during opening of jaw.
With reference to the human body, if bilateral symmetry is violated, then it may be due to some abnormalities, most of the times.
Key words: Stocking density and bilateral symmetry, logistic regression, morphological traits.
Even in these circumstances by its bilateral symmetry, if scoliosis therapeutic contribution of this type of movement is relatively small.
Feeding larvae of asteroids and holothuroids lack larval arms but still exhibit bilateral symmetry in lobes and folds of the ectoderm as well as in the arrangement of the ciliated band.
The biological world is extraordinarily inventive with bilateral symmetry. The following examples just scratch the surface of what Gardner has to tell us.
The compressed grooves are curved along the entire lengths thereof and are arranged in bilateral symmetry around the longitudinal center line.
And one of these is bilateral symmetry, which is how well your left side matches your right.
The split of this play in exactly half is consistent with Rastall's finding that most of the plays he examined also exhibit such bilateral symmetry. (9) There is symmetry also in the repeated rhyme scheme.
Observing and understanding bilateral symmetry in natural forms.
By contrast, the bodies of most other animals have bilateral symmetry, in which similar parts are positioned on the left and right sides of a central axis that runs through the head and anus.

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