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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]
In an ordinary microscopic section, viewed by transmitted light, they appear as fusiform opaque spots. Each lacuna is occupied during life by a branched cell, termed an osteocyte, bone-cell or bone-corpuscle. Lacunae are connected to one another by small canals called canaliculi. A lacuna never contains more than one osteocyte.
Parenchyma is a versatile ground tissue that generally constitutes the "filler" tissue in soft parts of plants. It forms, among other things, the cortex (outer region) and pith (central region) of stems, the cortex of roots, the mesophyll of leaves, the pulp of fruits, and the endosperm of seeds.
Parietal epithelial cell (PEC) Podocyte; Angioblast → Endothelial cell; Mesangial cell. Intraglomerular; Extraglomerular; Juxtaglomerular cell; Macula densa cell; Stromal cell → Interstitial cell → Telocytes; Kidney proximal tubule brush border cell; Kidney distal tubule cell; Connecting tubule cells; α-intercalated cell; β-intercalated ...
The cortex of Lepidodendrids typically consisted of the inner, middle, and outer cortex, distinguished by their cell types. The inner cortex is the narrowest and consists of small parenchyma cells; secretory cells, lacunae, and various sclerotic cells also can be found in this section. The middle cortex is larger and in turn consists of larger ...
Russia has freed Marc Fogel, a U.S. schoolteacher and former employee of the U.S. Embassy in Moscow, who had been serving a 14-year sentence for drug smuggling after being caught in possession of ...
Chondrocytes develop in the embryo from mesenchymal progenitor cells through a process known as chondrogenesis. [2] [3] A chondrocyte can then undergo mitosis to form an isogenous group within its lacuna. [3] [4]
As Alzheimer’s disease is the most common form of dementia — affecting an estimated 6.7 million Americans — it’s not surprising that people who experience memory loss may suspect AD.. In ...