(Of a vessel or opening) conveying fluid outward. The opposite of incurrent.
- The basic body form of sponges consists of numerous small incurrent canals called ostia (sing. ostium) and one or more large excurrent opening called oscula (sing. osculum).
- That is, sperm are created, concentrated and sent out the excurrent openings, sometimes in masses so dense that the sponges appear to be smoking.
- The velocity of the excurrent stream through the osculum may be several hundred times that at the level of the choanocytes.
Early 17th century: from Latin excurrent- 'running out', from the verb excurrere.
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