. Human physiology. he ducts of the glands which pour their secretions therein; alsoto the membranes that form the linings of the blood-vessels,lymphatics, and serous cavities; the respiratory passages; thesensory surfaces of the mouth, nose, eyes, and ears; the cavitiesof the brain : and the central canal of the spinal cord. In structure, epithelium consists of cells of various shapes,sometimes arranged in a single layer (simple epithelium), and EPITHELIUM 227 sometimes in several superimposed layers (laminated epithelium).Each cell has within it a portion of denser substance called thenucleu
. Human physiology. he ducts of the glands which pour their secretions therein; alsoto the membranes that form the linings of the blood-vessels,lymphatics, and serous cavities; the respiratory passages; thesensory surfaces of the mouth, nose, eyes, and ears; the cavitiesof the brain : and the central canal of the spinal cord. In structure, epithelium consists of cells of various shapes,sometimes arranged in a single layer (simple epithelium), and EPITHELIUM 227 sometimes in several superimposed layers (laminated epithelium).Each cell has within it a portion of denser substance called thenucleus. The different varieties of epithelia are classified according tothe form and arrangement of their cells, or according to thefunctions which these cells perform. Those epithelial structures which consist of flat scale-like cellsare known as squamous, or tesselated epithelia. In these thecells are either cemented together by some kind of intercellularsubstance, or they are united by partial fusion, or by the inter-.
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