| axial gradient |
A gradient of physiological or metabolic activity exhibited by embryos and many adult animals, the principal one of which follows the main axis of the body, being highest at the anterior end and lowest at the posterior end.
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| axial light |
Light with rays parallel to each other and to the optic axis.
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| axial line |
A line running in the main axis of the body or part of it. The axial line of the hand runs through the middle digit; the axial line of the foot runs through the second digit.
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| axial mesoderm |
Portion of the mesoderm that gives rise to the notochord and prechordal plate.
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| axial position |
A radiographical examination position in which an image is obtained with the central ray entering the body at an angle.
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