| 词汇 | epidermis |
| 释义 | epidermis noun[ S or U ] anatomy specializeduk /ˌep.ɪˈdɜː.mɪs/ us /ˌep.əˈdɝː.mɪs/ the thin outer layer of the skin表皮 The skin, & skin colour anti-wrinkle ashy basal cell blush complexion corium flushed freckle-faced peaches and cream percutaneous perionychium permatan pigmented rubicund strawberry mark subcutaneous veined wanly webbing wheat complexion Below the epidermis lies the dermis. Skin is made up of three layers: the epidermis, the dermis, and the subcutis. The epidermis, the outer layer, includes dead skin cells that are constantly falling away and being replaced. These help control our body’s temperature by sending a water-rich liquid – sweat – up to the epidermis. Examine the epidermis on the back of the hand and palm. Scales small, and concealed in a thick epidermis. The epidermis may be very easily removed, and is perfectly colorless. The epidermis, which is thin and shiny, gives way, and the nail is usually shed. They are covered externally by the epidermis. epidermis | American Dictionaryepidermis noun[ C/U ] us/ˌep·ɪˈdɜr·məs/ biology the thin outer layer of the skin Examples of epidermisepidermis These geometrically regular cells of hypodermis strongly contrasted the epidermis, composed of smaller cells with sinusoidal anticlinal walls. The testa epidermis is peculiar in that the outer walls of dry seeds are invaginated, while they bulge outwards in wetted seeds. Except immediately beneath the epidermal scales, ribosomes are not generally found within the outer epidermis. In general, the outer surface of the epidermis is relatively smooth, although in certain places it may be highly folded. There is a diffuse lymphocytic infiltrate in the epidermis extending into the dermis. There are no subsidiary cells, and the guard cells appear level with the rest of the epidermis. The axis cells are alive, except a part of the epidermis, which is magnified in the inset (cell walls highlighted). As seedling growth proceeds, lipoxygenases become confined to cells surrounding the vascular bundle, to the epidermis and to the hypodermis. The basement membrane is a zone of 0.1 mm thickness that connects the epidermis to the dermis. Structurally, the skin consists of epidermis, dermis and basement membrane zone. Accelerated melanin transfer to keratinocytes then results in a large increase in melanin granules in the epidermis. Accelerated melanin transfer to keratinocytes then results in a large increase in melanin granules in the epidermis (fig005hah). This relationship in stomatal density between lower and upper epidermis also held true for shade plants. Such preparations are difficult to study pharmacologically because the tegument or epidermis restricts access of drugs to the muscles. Thus, bulge stem cells are multipotent and can give rise to epidermis, hair follicle and sebaceous gland lineages. 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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