The union of the atlas and epistropheus is described in this section because (1) there is often a direct communication between the synovial cavity of the transverse epistropic and the occipito-atlantal joints; (2) the rotatory movements of the head take place around the dens (odontoid process); and (3) important ligaments from the dens pass over the atlas to the occiput.
Source: wiktionary
The apostrophic or epistrophic arrangement is the result of complicated laws dependent on the action of light; very strong irritation of light causes the chlorophyll-grains to collect into one or two lumps, a phenomenon for which Schimper proposes the term systrophe.
Source: wiktionary
The accompanying diagram shows all the information I have been able to collect regarding the plant's epistrophic interval.
Source: wiktionary
The epistropic interval varies in position and in extent in different species.
Source: wiktionary
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