| linea splendens | A thickened band of pia mater along the midline of the anterior surface of the spinal cord. Synonym: Haller's line. (05 Mar 2000) |
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| linea sternalis | A vertical line corresponding to the lateral margin of the sternum. Synonym: linea sternalis. (05 Mar 2000) |
| linea subcostalis | A transverse line transecting the inferiormost border of the thoracic cage, indicating the subcostal plane. See: subcostal plane. Synonym: linea subcostalis. (05 Mar 2000) |
| linea supracristalis | A transverse line transecting the high point of both iliac crests, indicating the supracristal plane. See: supracristal plane. Synonym: linea supracristalis. (05 Mar 2000) |
| linea temporalis inferior | The lower of two curved lines on the parietal bone; it marks the outer limit of attachment of the temporalis muscle. Synonym: linea temporalis inferior, temporal ridge. (05 Mar 2000) |
| linea temporalis superior | 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) |
| linea trapezoidea | The area on the inferior surface of the clavicle near its lateral extremity on which the trapezoid ligament attaches. Synonym: linea trapezoidea, trapezoid ridge. (05 Mar 2000) |