Look up septum in Wiktionary, the free dictionary.
In biology, a septum (Latin for something that encloses; plural septa) is a wall, dividing a cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate.
Histological septa are seen throughout most tissues of the body, particularly where they are needed to stiffen soft cellular tissue, and they also provide planes of ingress for small blood vessels. Because the dense collagen fibres of a septum usually extend out into the softer adjacent tissues, microscopic fibrous septa are less clearly defined than the macroscopic types of septa listed above. In rare instances, a septum is a cross-wall. Thus it divides a structure into smaller parts.
Annelids have septa that divide their coelom into segmented chambers.
Many shelled organisms have septa subdividing their shell chamber, including rhizopods, cephalopods and gastropods, the latter seemingly serving as a defence against shell-boring predators.[1][2]
Laboratory technology
A rubber septum is an engineered membrane that permits transfer of a substance (usually liquid or gas) without contact with air, usually using a syringe with needle.
References
^Ishikawa, Makiko; Kase, Tomoki; Tsutsui, Hidekazu (2018). "Deciphering deterministic factors of predation pressures in deep time". Scientific Reports. 8 (1): 17532. Bibcode:2018NatSR...817532I. doi:10.1038/s41598-018-35505-1. PMC6277388. PMID 30510248.
^Vermeij, Geerat J. (1982). "Unsuccessful Predation and Evolution". The American Naturalist. 120 (6): 701–720. doi:10.1086/284025. S2CID 84610680.
January 26, 2023
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