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Aerenchyma in stem cross section of a typical wetland plant. Aerenchyma or aeriferous parenchyma [1] or lacunae, is a modification of the parenchyma to form a spongy tissue that creates spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root. [2]
Download as PDF; Printable version; In other projects Wikidata item; Appearance. ... [1] Development. The embryological origin of the lacuna magna is contested. [2]
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
When chondrocytes die, matrix metalloproteinases result in catabolism of various components within the extracellular matrix and the physical boundaries between neighboring lacunae (the spaces housing chondrocytes) weaken. This can lead to the merging of these lacunae, creating larger empty spaces. [8] [9]
This constitutes the so-called capsule of the space. Each lacuna is generally occupied by a single cell, but during the division of the cells, it may contain two, four, or eight cells. Lacunae are found between narrow sheets of calcified matrix that are known as lamellae (/ l ə ˈ m ɛ l i / lə-MEL-ee).
The theory of recapitulation, also called the biogenetic law or embryological parallelism—often expressed using Ernst Haeckel's phrase "ontogeny recapitulates phylogeny"—is a historical hypothesis that the development of the embryo of an animal, from fertilization to gestation or hatching (), goes through stages resembling or representing successive adult stages in the evolution of the ...
Scientific lacuna, an area of science that has not been studied but has potential to be studied; Lacuna or accidental gap, in linguistics, a word that does not exist but which would be permitted by the rules of a language; Lacuna, in law, largely overlapping a non liquet ("it is not clear"), a gap (in the law)
Scientific lacunae often have the potential to be studied in the future when more areas of sciences are explicitly defined or the right conditions do occur, yet this can be made difficult if the area of science is commonly not considered a proper area for scientific study. [4]