The right-left axis is established during the gastrulation process.  This imaginary axis line separates the two lateral sides of the organism.   

Michigan State University

- anterior-posterior axis
- dorsal-ventral axis
- right-left axis

Embryonic Axes Established During Gastrulation

Barresi, M. J., &amp; Gilbert, S. F. (2020). Developmental Biology (12th ed.). New York: Sinauer.

Developmental Biology (12th ed.)

The anterior-posterior axis is established during the gastrulation process.  This imaginary axis line runs from the head to the tail, or in organisms without these structures, from the mouth to the anus.  

Anterior-Posterior Axis

The dorsal-ventral axis is established during the gastrulation process.  This imaginary axis line runs from the back to the belly, or the dorsum to the ventrum.  

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