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X 100. a, Haversian canals; b, lacunae seen from the side; c, others seen from the surface in lamella, which are cut horizontally. Nucleated bone cells and their processes, contained in the bone lacunae and their canaliculi respectively.
From least- to terminally-differentiated, the chondrocytic lineage is: Colony-forming unit-fibroblastMesenchymal stem cell / marrow stromal cell; Chondrocyte
Chondroblasts are called chondrocytes when they embed themselves in the cartilage matrix, consisting of proteoglycan and collagen fibers, until they lie in the matrix lacunae. Once they embed themselves into the cartilage matrix, they grow the cartilage matrix by growing more cartilage extracellular matrix rather than by dividing further.
An osteocyte, an oblate shaped type of bone cell with dendritic processes, is the most commonly found cell in mature bone. It can live as long as the organism itself. [1] The adult human body has about 42 billion of them. [2]
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]
The Big Book, first published in 1939, was the size of a hymnal. With its passionate appeals to faith made in the rat-a-tat cadence of a door-to-door salesman, it helped spawn other 12-step-based institutions, including Hazelden, founded in 1949 in Minnesota. Hazelden, in turn, would become a model for facilities across the country.
Hyaline cartilage is the most common kind of cartilage in the human body. [2] It is primarily composed of type II collagen and proteoglycans. [2] Hyaline cartilage is located in the trachea, nose, epiphyseal plate, sternum, and ribs.
Without accurate, up-to-date information from a safe and reliable source, young people are left woefully unprepared to become sexually healthy and informed adults. A recent study found that 29 percent of female college students could not locate the clitoris on a diagram of the vulva.