| Reid's base line | <anatomy, radiology> A line drawn from the inferior margin of the orbit to the auricular point at the superior border of the orifice of the external auditory meatus and extending backward to the centre of the occipital bone. It is used as the zero plane in computed tomography. (05 Mar 2000) |
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| cell line | <cell culture> A cell line is a permanently established cell culture that will proliferate indefinitely given appropriate fresh medium and space. Lines differ from cell strains in that they have escaped the Hayflick limit and become immortalised. Some species, particularly rodents, give rise to lines relatively easily, whereas other species do not. No cell lines have been produced from avian tissues and the establishment of cell lines from human tissue is difficult. Many cell biologists would consider that a cell line is by definition already abnormal and that it is on the way towards becoming the culture equivalent of a neoplastic cell. (26 Mar 1998) |
| cell line rights | <cell culture> Ownership of a new organism entity. Rulings indicate that any organism that is patentable at all can be patented if it has been manipulated to do something useful. Usually, the rights do not reside with the individual who has supplied the source of the organism, but with the individual or organisation who has made it. (26 Mar 1998) |
| cell line, transformed | Eukaryotic cell line obtained in a quiescent or stationary phase which undergoes conversion to a state of unregulated growth in culture, resembling an in vitro tumour. It occurs spontaneously or through interaction with viruses, oncogenes, radiation, or drugs/chemicals. (12 Dec 1998) |
| median line | <anatomy> See: anterior median line, posterior median line. (05 Mar 2000) |
| pectinate line | The line between the simple columnar epithelium of the rectum and the stratified epithelium of the anal canal. Synonym: linea anocutanea, anocutaneous line, dentate line. (05 Mar 2000) |
| pectineal line | A ridge running down the posterior surface of the shaft of the femur from the lesser trochanter to which the pectineus muscle attaches; continuous superiorly with intertrochanteric line and inferiorly with the medial lip of the linea aspera. Synonym: linea pectinea. (05 Mar 2000) |
| pectineal line of pubis | The continuation on the superior ramus pubis of the linea terminalis, forming a sharp ridge. Synonym: pecten ossis pubis, pectineal line of pubis. (05 Mar 2000) |
| cement line | The refractile boundary of an osteon or interstitial lamellar system in compact bone. (05 Mar 2000) |
| gluteal line | One of three rough curved lines on the outer surface of the ala of the ilium: anterior (or middle) gluteal line, inferior gluteal line, and posterior gluteal line; the two areas bounded by these give attachment to the gluteus minimus muscle below and gluteus medius above. Synonym: linea glutea. (05 Mar 2000) |
| central line | <equipment> Small, flexible plastic tube inserted into the large vein above the heart, through which drugs and blood products can be given and blood samples withdrawn painlessly. Synonym: central line, Hickman catheter. (12 Jan 1998) |
| central venous line | <equipment> Small, flexible plastic tube inserted into the large vein above the heart, through which drugs and blood products can be given and blood samples withdrawn painlessly. Synonym: central line, Hickman catheter. (12 Jan 1998) |
| retentive fulcrum line | <dentistry> An imaginary line connecting the retentive points of clasp arms on retaining teeth adjacent to mucosa-borne denture bases, an imaginary line connecting the retentive points of clasp arms, around which line the denture tends to rotate when subjected to forces such as the pull of sticky foods. (05 Mar 2000) |
| cervical line | A continuous anatomical irregular curved line marking the cervical end of the crown of a tooth and the cementoenamel junction. (05 Mar 2000) |
| chamberlain's line | <radiology> Line from posterior hard palate to posterior lip of foramen magnum, if dens greater than 3mm above line most likely to be basilar invagination see also: McGregor's line (easier to use) (12 Dec 1998) |