| elastic fibres | Fibre's that are 0.2 to 2 um in diameter but may be larger in some ligaments; they branch and anastomose to form networks and fuse to form fenestrated membranes; the fibre's and membranes consist of microfibrils about 10 nm wide and an amorphous substance containing elastin. Synonym: yellow fibres. (05 Mar 2000) |
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| elastic lamella | A thin sheet or membrane composed of elastic fibres; distinguished from elastic membrane, which usually refers to a condensed mass of fibres, as in an artery, whereas an elastic lamella may be a looser elastic layer such as found in a vein or the respiratory tract. (05 Mar 2000) |
| elastic layers of arteries | elastic laminae of arteries |
| elastic layers of cornea | See: anterior limiting layer of cornea, posterior limiting layer of cornea. (05 Mar 2000) |
| elastic ligature | A rubber ligature that slowly constricts, in orthodontics, a stretchable threadlike material that may be tied from a tooth to an archwire or from tooth to tooth to gain movement of these units. (05 Mar 2000) |
| elastic limit | The greatest stress to which a material may be subjected and still be capable of returning to its original dimensions when the forces are released. (05 Mar 2000) |
| elastic membrane | A membrane formed of elastic connective tissue, present as fenestrated lamellae in the coats of the arteries and elsewhere. (05 Mar 2000) |
| elastic skin | |
| elastic tissue | A form of connective tissue in which the elastic fibres predominate; it constitutes the ligamenta flava of the vertebrae and the ligamentum nuchae, especially of quadrupeds; it occurs also in the walls of the arteries and of the bronchial tree, and connects the cartilages of the larynx. Synonym: elastica, tela elastica. (05 Mar 2000) |
| acquired nevus | A melanocytic nevus that is not visible at birth, but appears in childhood or adult life. (05 Mar 2000) |
| balloon cell nevus | A nevus in which many of the cells are large, with clear cytoplasm. (05 Mar 2000) |
| basal cell nevus | A hereditary disease noted in infancy or adolescence, characterised by lesions of the eyelids, nose, cheeks, neck, and axillae, appearing as uneroded flesh-coloured papules, some becoming pedunculated, and histologically indistinguishable from basal cell epithelioma; also noted are punctate keratotic lesions of the palms and soles; the lesions usually remain benign, but in some cases ulceration and invasion occur and are evidence of malignant change; autosomal dominant inheritance. (05 Mar 2000) |
| basal cell nevus syndrome | <syndrome> An inherited group of defects which involve abnormalities of the skin, eyes, nervous system, endocrine, glands and bones. The condition is characterised by an unusual facial appearance and a predisposition for skin cancer. (27 Sep 1997) |
| bathing trunk nevus | These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. (27 Sep 1997) |
| Becker's nevus | A nevus first seen as an irregular pigmentation of the shoulders, upper chest, or scapular area, gradually enlarging irregularly and becoming thickened and hairy. Synonym: pigmented hair epidermal nevus. (05 Mar 2000) |