longitudinal axis
a lengthwise axis from head to tail end of an animal.
longitudinal muscle fiber
Arranged in a feather-like pattern, this thick layer of muscles is found below the circular muscle fibers.
X-ray evidence of a helical arrangement of sub-units around the longitudinal axis. Biochim Biophys Acta. 13:10-19. Entrez PubMed 13140277
^ a b Watson, J.D. and F.H. Crick. 1953. A structure for deoxyribose nucleic acids.
Theoretically the most efficient manner to attain these objects would be to prolong the innermost filaments of the bone as straight lines parallel to the longitudinal axis of the bone, and gradually to flare the outer shell of compact bone outward, ...
The flame cell system functions in excretion and consists of a series of interconnecting canals that run length of the body on either side of the longitudinal axis and side branches of the canals, each ending in a flame cell.
metamere A repeated body unit along the longitudinal axis of an animal; a somite, or segment.
individual parts are arranged symmetrically around a central axis; serial symmetry, or zonal symmetry, as in earthworms, is that in which the segments or metameres of the body are disposed in a zonal manner one after the other in a longitudinal axis.
 See also: Human, Action, Class, Origin, Trans
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