from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Lateral to the neural tube
- adj. Near an optical axis
from the GNU version of the Collaborative International Dictionary of English
- adj. On either side of the axis of the skeleton.
from The Century Dictionary and Cyclopedia
- In zoology and anatomy, situated on either side of the long axis of the body; lying laterally to the right or left of the spinal column: opposed to epaxial and hypaxial: as, the paraxial processes of vertebræ.
Swirl embryos, for example, have much enlarged paraxial mesoderm, the forming somites encircle the entire embryo (Figure 5F), and ventrally derived structures such as blood and the ventral tail fin are reduced or lacking entirely (57).
The embryo is more completely separated from the yolk-sac, and the paraxial mesoderm is being divided into the primitive segments (Fig. 58).
On either side of it is a column of paraxial mesoderm which becomes subdivided into a number of more or less cubical segments, the primitive segments (Figs. 19 and 20).
A longitudinal groove appears on the dorsal surface of either half and divides it into a medial column, the paraxial mesoderm, lying on the side of the neural tube, and a lateral portion, the lateral mesoderm.
The mesoderm in the floor of the groove connects the paraxial with the lateral mesoderm and is known as the intermediate cell-mass; in it the genito-urinary organs are developed.
Toward the end of the second week transverse segmentation of the paraxial mesoderm begins, and it is converted into a series of well-defined, more or less cubical masses, the primitive segments (Figs. 18, 19, 20), which occupy the entire length of the trunk on either side of the middle line from the occipital region of the head.
Organized by subject, the book begins with the fundamental law of geometric optics, Snell's law of refraction, and states the paraxial ray trace equations, then moves on to thin lenses and increasingly more sophisticated components and multi-element systems.
The current study was carried out to test whether any of the five major signaling pathways are regulated by tbx16 during two specific stages of mesoderm development: primitive red blood cell formation in the intermediate mesoderm and somite formation in the tail paraxial mesoderm.
Two representative light rays, one paraxial and one traveling through the center of the lens (the principal ray), are employed to establish the parameters of the imaging situation.
Cax mutant embryos have somites of variable size, showed partly abnormal Lfng expression and, consistently defective anterior-posterior somite patterning and axial skeleton development but had virtually no defects in several other Notch-regulated early developmental processes outside the paraxial mesoderm that we analyzed.