| 词汇 | epithelium |
| 释义 | epithelium noun[ C or U ] medical specializeduk /ˌep.ɪˈθiː.li.əm/ us /ˌep.ɪˈθiː.li.əm/pluralepitheliauk /ˌep.ɪˈθiː.li.ə/ us /ˌep.ɪˈθiː.li.ə/ a layer of cells covering all the surfaces of the body except the interior of blood and lymph vessels上皮，上皮组织 Substances & structures in the body abductor accessorius ACL actin adductor funiculus fusiform glomerular glomerulus GnRH navicular neuroendocrine neurohormonal neurohormone nociceptive tendinous tendinum tendo tensor Th Cells belonging to the epithelium. Its surface is at first smooth and shiny, but as necrosis of the tissue elements takes place in the centre, it becomes concave, and in many cases the epithelium is shed, and an ulcer is formed. The cells composing the columns and filling the alveoli vary with the character of the epithelium in which the cancer originates. The middle layer, on the contrary, forms nerves and muscles, vessels and connective tissue, and little or no epithelium. They are distributed through every tissue of the body, except the epidermis and its products, the epithelium, the cartilages, and the substance of the teeth. Examples of epitheliumepithelium Owing to their lower affinity for the epithelium, spermatozoa that become capacitated are released from the storage site. The apical lamellae and basal invaginations are characteristic features of trematode excretory epithelium and are believed to be concerned with its absorptive capacity. The cornea is frequently involved, with 353 in this series having multiple small dendritic or stellate lesions and 294 granular deposits under the corneal epithelium. However, the retina shrank only by about 1% relative to the pigment epithelium, so this does not seem to be the case. The main collecting tubes were connected to the excretory bladder epithelium by ring-shaped septate junctions (figs 10, 11). Some cells with a morphology very similar to macrophages were found in the epithelium of seminiferous tubules of immunodeficient mice. The colour intensity of the immunohistochemical reaction products is also much higher in tumour cells compared with normal epithelium. Later these cells progressively flatten, expand and eventually fuse, forming a thin syncytium underlying the primitive epithelium (fig. 3b). The retinal pigment epithelium cytoplasm showed dense bodies and clumps of lipids. Small proline-rich proteins are cross-bridging proteins in the cornified cell envelopes of stratified squamous epithelia. In relation to goblet cell metaplasia of the bile duct epithelium, the bile contains a high content of mucous secretion. Like us, the latter authors asserted that the primitive epithelium in schistosomes is embryo derived. Surprisingly, however, there was no other epithelial abnormality except in the vicinity of the worm where the epithelium was flattened. In both species the luminal surface of the excretory bladder epithelium is increased by lamellae, and the basal plasma membrane forms invaginations. This arrangement may resemble superficially a sunken epithelium, but careful observation at ultrastructural level reveals that these structures are completely different. See all examples of epithelium These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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