| posterior median line | The line of intersection of the midsagittal plane with the posterior surface of the body. Synonym: linea mediana posterior. (05 Mar 2000) |
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| Poupart's line | A vertical line passing through the centre of the inguinal ligament on either side; it marks off the hypochondriac, lumbar, and iliac from the epigastric, umbilical, and hypogastric regions, respectively. (05 Mar 2000) |
| preaxillary line | A vertical line extending inferiorly from the anterior axillary fold. Synonym: linea axillaris anterior, linea preaxillaris, preaxillary line. (05 Mar 2000) |
| Haller's line | A thickened band of pia mater along the midline of the anterior surface of the spinal cord. Synonym: Haller's line. (05 Mar 2000) |
| Hampton line | A thin radiolucent band across the neck of a contrast-filled benign gastric ulcer, indicating mucosal oedema. Compare: Carman's sign. (05 Mar 2000) |
| saemicircular line | A crescentic line, not always clearly defined, which marks the lower limit of the posterior layer of the sheath of the rectus abdominis muscle. Synonym: linea arcuata vaginae musculi recti abdominis, Douglas' line, linea saemicircularis, saemicircular line. (05 Mar 2000) |
| saemicircular line of Douglas | A crescent-shaped line that defines the end of the posterior fascial sheath of the rectus abdominis muscle. (05 Mar 2000) |
| sagittal line | Any line parallel to the midline, indicating a sagittal plane. (05 Mar 2000) |
| product line management | Management control systems for structuring health care delivery strategies around case types, as in drgs, or specific clinical services. (12 Dec 1998) |
| Hensen's line | <cell biology> The H band is an area within muscle tissue which is light when stained and consists only of myosin fibres (and no actin fibres). The H band is at the centre of each muscle sarcomere. (09 Oct 1997) |
| S-BP line | A line connecting the sella with the Bolton point; it indicates the posterior portion of the cranial base in cephalometrics. (05 Mar 2000) |
| scapular line | A vertical line passing through the inferior angle of the scapula. Synonym: linea scapularis. (05 Mar 2000) |
| hickman line | <equipment> A narrow plastic tube which is inserted, under anaesthetic, into a major blood vessel in the chest. It is used for patients undergoing intensive therapy and provides a route for taking blood samples and administering drugs without repeated needle puncture of a vein. (13 Nov 1997) |
| highest nuchal line | A line above and parallel to the superior nuchal line on the external surface of the occipital bone; it gives attachment to the epicranial aponeurosis and occipitalis muscle. Synonym: linea nuchae suprema. (05 Mar 2000) |
| high lip line | The greatest height to which the lip is raised in normal function or during the act of smiling broadly. (05 Mar 2000) |