Ethmoid bulla
Raised portion of ethmoid bone in middle meatus.
Ethmoid sinuses
Numerous small thin-walled spaces or air cells in the ethmoid bone, where they form an ethmoidal labyrinth.
Extracellular matrix
Extracellular matrix (EcM) is any
material produced by cells and secreted into the surrounding medium. The EcM of connective tissue is particularly extensive and the properties of the EcM determine the properties of the tissue. In broad terms, there are three major components: fibrous elements (particularly collagen, elastin or reticulin), link proteins (e.g., fibronectin, laminin) and space-filling molecules. The matrix may
be mineralized to resist compression (as in bone) or dominated by tension-resisting fibers (as in tendon). The basal lamina of epithelial cells is another EcM. Although EcM is produced by cells, it has recently become clear that the EcM can influence the behavior of cells quite markedly.
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