| sternal line | A vertical line corresponding to the lateral margin of the sternum. Synonym: linea sternalis. (05 Mar 2000) |
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| Stocker's line | A fine line of pigment in the corneal epithelium near the head of a pterygium. (05 Mar 2000) |
| nipple line | A vertical line passing through the nipple on either side. Synonym: linea mamillaris, nipple line. (05 Mar 2000) |
| N line | <cell biology> Regions in the sarcomere of striated muscle. The N1 line is in the I band near the Z disc, the N2 line is at the end of the A band. The N lines may represent the location of proteins such as nebulin that contribute to the stability of the sarcomere. (18 Nov 1997) |
| subcostal line | A transverse line transecting the inferiormost border of the thoracic cage, indicating the subcostal plane. See: subcostal plane. Synonym: linea subcostalis. (05 Mar 2000) |
| Daubenton's line | The line passing between the opisthion and the basion. See: Daubenton's angle, Daubenton's plane. (05 Mar 2000) |
| superior nuchal line | The ridge that extends laterally from the external occipital protuberance toward the lateral angle of the occipital bone; it gives attachment to the trapezius, sternocleidomastoid, and splenius capitis muscles. Synonym: linea nuchae superior. (05 Mar 2000) |
| superior temporal line | The upper of two curved lines on the parietal bone; the temporal fascia is attached to it. Synonym: linea temporalis superior, temporal ridge. (05 Mar 2000) |
| supracrestal line | A transverse line transecting the high point of both iliac crests, indicating the supracristal plane. See: supracristal plane. Synonym: linea supracristalis. (05 Mar 2000) |
| survey line | A line scribed on an abutment tooth of a dental cast by means of a dental surveyor indicating the height of contour of the tooth according to a specific path of insertion, a line which serves as a guide in the proper location of various parts of a clasp assembly for a removable partial denture. Synonym: clasp guideline, Cummer's guideline. (05 Mar 2000) |
| demarcation line of retina | Junction of avascular and vascular retina in retinopathy of prematurity; line marking the limits of an old retinal detachment. (05 Mar 2000) |
| Dennie's line | An accentuated line or fold below the margin of the lower eyelid; characteristic in atopic dermatitis. Synonym: Dennie's infraorbital fold. (05 Mar 2000) |
| Sydney line | A variation of the proximal transverse palmar flexion crease that reaches the ulnar side of the palm; associated with acute lymphocytic anaemia in early childhood, rubella embryopathy, and Down's syndrome. Synonym: Sydney line. (05 Mar 2000) |
| sylvian line | The line of the posterior limb of the lateral sulcus (sylvian fissure) of the cerebral cortex. (05 Mar 2000) |
| dentate 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) |