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Proximal raphe
The proximal raphe is the portion of a raphe branch near the central nodule of a valve. The proximal raphe end, a more specific location, borders the central nodule.
Scanning electron micrograph of Gomphonema. The arrows show the external proximal raphe ends. The raphe is not deflected or dilated. External raphe fissures are absent.
Image Credit: Josh Stepanek
Light micrograph of Amphora. The arrows show the proximal raphe ends, which are dorsally deflected.
Image Credit: Sarah Spaulding
Scanning electron micrograph of an external view of Muelleria. The external proximal raphe fissures are unilaterally deflected, or bent, to the same side of the valve.