| secondary saturation | A technique of nitrous oxide anaesthesia consisting of an abrupt curtailment of the oxygen in the inhaled mixture to produce a deep plane of anaesthesia, following which oxygen is administered to correct hypoxia. (05 Mar 2000) |
|---|---|
| secondary screw-worm | An accidental or facultative screw-worm that enters a prior wound or suppurated condition and feeds on infected rather than intact tissues. Many blowflies are included, such as Calliphora vicina, Phaenicia sericata, Phormia regina, Cochliomyia macellaria, Chrysomyia species, and other fleshflies. (05 Mar 2000) |
| secondary sensory cortex | A cortical region occupying the parietal operculum (upper lip of the lateral sulcus) closely posterior to the foot of the postcentral gyrus; like the primary somatic-sensory cortex of the postcentral gyrus, this region receives sensory impulses originating in face, trunk, and limbs; projections to the s.s.c. Are from the ventral basal complex (ventral posteromedial and posterolateral thalamic nuclei) and from the primary somesthetic cortex. (05 Mar 2000) |
| secondary sensory nuclei | Nuclei terminales, collective term indicating those nerve cell groups in the rhombencephalon and spinal cord in which the afferent fibres of the spinal and cranial nerves terminate. Synonym: nuclei terminationis, secondary sensory nuclei. (05 Mar 2000) |
| secondary sex characters | Those character's peculiar to the male or female that develop at puberty, e.g., the beard of men and the breasts of women. (05 Mar 2000) |
| secondary site | A second site in which cancer is found. Example: cancer in the lymph nodes near the breast is a secondary site. (09 Oct 1997) |
| secondary spiral lamina | A ridge on the outer wall of the first turn of the cochlea opposite the spiral lamina. Synonym: lamina spiralis secundaria, secondary spiral plate. (05 Mar 2000) |
| secondary spiral plate | A ridge on the outer wall of the first turn of the cochlea opposite the spiral lamina. Synonym: lamina spiralis secundaria, secondary spiral plate. (05 Mar 2000) |
| secondary structure | <molecular biology> Structures produced in polypeptide chains involving interactions between amino acids within the chain. Especially _ helical and _ pleated sheet structures. Also applies to the complex folding of nucleic acids as, for example: the clover leaf structure of tRNA. (18 Nov 1997) |
| secondary succession | The progression of plant communities following disturbances such as fire, windthrow and timber harvesting. See Succession. (05 Dec 1998) |
| secondary suture | Delayed closure of a wound. (05 Mar 2000) |
| secondary syphilid | A syphilitic skin lesion characteristic of the second stage of the disease. (05 Mar 2000) |
| secondary syphilis | The second stage of syphilis See: syphilis. Synonym: mesosyphilis. (05 Mar 2000) |
| secondary teeth | <dentistry> The permanent teeth, i.e. The second group of teeth to come in. (08 Jan 1998) |
| secondary telangiectasia | Telangiectasia related to a known cause of prolonged dermal vascular dilatation such as sunlight, varicose veins, and connective tissue diseases; often associated with atrophy of the skin. (05 Mar 2000) |