Editing Anatomical terms of location (section)

===Radially symmetrical organisms===
[[Radial symmetry|Radially symmetrical organisms]] include those in the group [[Radiata]]{{snd}} primarily [[Cnidaria]]ns ([[jellyfish]], [[sea anemones]] and [[corals]], and the [[Ctenophora|comb jellies]]).<ref name="Ruppert2004B">{{cite book |last1=Ruppert |first1=EE |last2=Fox |first2=RS |last3=Barnes |first3=RD |title=Invertebrate zoology: a functional evolutionary approach |date=2004 |page=112|publisher=Thomson-Brooks/Cole |location=Thomson, Belmont |isbn=0-03-025982-7 |edition=7th}}</ref> Adult [[Echinodermata|echinoderms]], such as [[starfish]], [[sea urchin]]s, [[sea cucumber]]s and others are also included, since they have a [[Radial symmetry|pentamerous symmetry]] having five [[rotational symmetry#n-fold rotational symmetry|discrete symmetric parts]] arranged around a central axis.<ref name="Ruppert2004A">{{cite book |last1=Ruppert |first1=EE |last2=Fox |first2=RS |last3=Barnes |first3=RD |title=Invertebrate zoology: a functional evolutionary approach |date=2004 |pages=873–875|publisher=Thomson-Brooks/Cole |location=Thomson, Belmont |isbn=0-03-025982-7 |edition=7th}}</ref> Echinoderm [[larva]]e are not included, since they are [[symmetry in biology|bilaterally symmetrical]].<ref name="Ruppert2004A"/> 

Cnidarians  have an incomplete digestive system, meaning that one end of the organism has a mouth, the '''oral end''' ({{ety|la|ōrālis|of the mouth}}), and the opposite '''aboral end''' ({{ety|la|ab-|away from}}) has no opening from the gut (coelenteron).<ref name="Ruppert2004B"/> They are radially symmetric around the '''oral-aboral axis'''.<ref name="Ruppert2004B"/> Having only the single distinctive axis, "lateral", "dorsal", and "ventral" have no meaning, and all can be replaced by the generic term '''peripheral''' ({{ety|grc|περιφέρεια|circumference}}). '''Medial''' can be used, but in the case of radiates indicates the central point, rather than a central axis as in vertebrates. Thus, there are multiple possible '''radial axes''' and '''medio-peripheral''' (half-) '''axes'''.<ref name="Oliveira2007">{{cite web |last1=Oliveira |first1=Otto Müller Patrão de |title=Chave de identificação dos Ctenophora da costa brasileira |url=https://www.researchgate.net/figure/Symmetry-planes-of-the-ctenophores-using-Bolinopsis-vitrea-as-model-a-view-of-the_fig1_247853778 |publisher=Biota Neotropica |access-date=6 April 2023 |ref=Oliveira2007}}</ref>

Comb jellies have a biradial symmetry about only two planes, a tentacular plane, and a pharyngeal plane.<ref name="Ruppert2004C">{{cite book |last1=Ruppert |first1=EE |last2=Fox |first2=RS |last3=Barnes |first3=RD |title=Invertebrate zoology: a functional evolutionary approach |date=2004 |page=184|publisher=Thomson-Brooks/Cole |location=Thomson, Belmont |isbn=0-03-025982-7 |edition=7th}}</ref>

<gallery widths="220" heights="110">
Image:Radiate Radial Axes.JPG|''[[Aurelia aurita]]'', another species of [[jellyfish]], showing multiple radial and medio-peripheral axes
File:Porania_pulvillus.jpg|The [[sea star]] ''[[Porania pulvillus]]'', aboral and oral surfaces
</gallery>
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