A scanning and transmission electron microscopic study of contractile trabecules in the rat spleen

Okajimas Folia Anatomica Japonica
K KimuraY Tanaka

Abstract

The fine structures of contractile trabecules in the splenic red pulp of the rat were examined by electron microscopy to elucidate their participation in the active contraction of the spleen. Numerous fine thready trabecules were developed in the red pulp. They were enveloped with a cytoplasmic layer of reticular cells and consisted of elongated smooth muscle cells, fascicles of collagenous fibrils and elastic fibers. Their fibrous components in the capsular ends extended in a triangular form of fanribs into the fibrous tunica of the capsule. Smooth muscle cell-like interstitial cells (SIC) were situated in the interfibrous spaces. Flattened SICs were affixed with cytoplasmic processes to the elastic lamina. The trabeculocapsular junctions were represented on the elastic lamina by grouped or isolated circular patches with concentrically arranged triangular processes and were also observed on the capsular serosa by plaques with scarce microvilli of serosal cells. Smooth muscle cells of the fine trabecules were equipped on the cell surface with anchoring structures to extracellular fibrous elements as previously described by Gabella (1981). Close associations were also seen between the smooth muscle cells and elastic fibers which...Continue Reading

Citations

May 2, 2012·Journal of Neuroimmunology·Sam D PerezDenise L Bellinger

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