List of abbreviations
of micros-
specialist terms
explained in
English +

Every attempt was made to provide correct information and labelling, however any liability for eventual errors or incompleteness is rejected!

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Dr. med.
H. Jastrow

of use
Hardly active bone producing cells (osteoblasts) of a monkey
(for unlabelled original image click here, please)

§ = mineralised bone (extracellular matrix with calciumhydroxylapatit crystals);
# = border seam (in this small region tiny crystals are being integrated into the non-calcified matrix called osteoid);
C = cytoplasm (cellular fluid with organells); Clv = Vesiculum clathrinum (clathrin-coated endocytotic vesicle);
Cmv = Corpusculum multivesiculare (multivesicular body);
Cri = Crista mitochondrialis (infolded inner membrane of a mitochondrium); Ec = euchromatin;
Ed = Endocytosis (intake of substances by formation of a Clv); G =Complexus golgiensis (Golgi-apparatus);
Hc = Heterochromatin; Kf = Fibrillae collagenosae (collagen fibrils; mainly of type 1);
Lys = Lysosoma (heterolysosome); Mi = mitochondria (crista-type);
Mm = Membrana mitochondrialis (mitochondrial membrane); Mme = Membrana mitochondrialis externa (outer mitochondrial membrane);
Mmi = Membrana mitochondrialis interna (inner mitochondrial membrane, which infolds forming Cri);
Mne = Membrana nuclearis externa (outer nuclear membrane); Mni = Membrana nuclearis interna (inner nuclear membrane);
N = Nucleus (nucleus); Nc = Nucleolus (nuclear body with 3 different regions: Pa, Pf and Pg);
P = Plasmalemma (cell membrane); Pa = Pars amorpha nucleoli (amorphous part of the nucleolus);
Pc = Processus cellulares (immotile cellular processes); Pf = Pars fibrosa nucleoli (fibrillar part of the nucleolus);
Pg = Pars granulosa nucleoli (granular part of the nucleolus);
PR = Polyribosomae (polyribosomes = grouped free ribosomes); RER = rough endoplasmic reticulum;
Spi = Spatium intercellulare (intercellular space mainly containing water); Spn = Spatium perinucleare (perinuclear space);
Vs = Vesicula secreti (secretory vesicle containing fine granular material which will contribute to the extracellular matrix).

In contrast to other images of bone formation (ossification) virtually no organic extracellular material (osteoid) is located in front of the border seam in the present image. This and the only small amount of RER indicates a very moderate activity of the shown osteoblasts. The mineralised bone (§) has nearly no electron-density and shows only very few shadows of collagen fibrils (Kf). Nevertheless, it consists of a dense network of such fibrils to which calciumhydroxylapatit crystals are attached as main component. This connection process takes place in the region of the border seam (#).

--> bone, connective tissue
--> Electron microscopic atlas Overview
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The image was kindly provided by Prof. H. Wartenberg, page & copyright H. Jastrow.