Layers of the gastrointestinal tract The wall structure of the tubular (hollow) organs follows a general organization that is uniform along the gastrointestinal tract. The lumen of the organs is covered with tunica mucosa (mucous membrane) that is composed of…
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Heart The primary component of the heart is the myocardium composed of cardiac muscle that has been described previously with the basic tissues. Briefly, cardiac muscle cells are elongated branched cells with centrally located, round or oval nuclei, many cells…
Lymphatic follicles Lymphatic follicles (lymphatic nodules) are spherical or ovoid structures composed of aggregated lymphocytes and a meshwork of reticular cells. Lymphatic follicles lack capsule, and they typically populate the lamina propria of the mucous membranes in the alimentary (gut-associated…
Epithelium Functionally, epithelium can be subdivided into two main types: covering (surface) epithelium and glandular epithelium. Surface epithelium covers mucous and serous membranes of tubular (hollow) organs as well as the outer surface of the body as epidermis. Structurally, surface…