| Sergent's white line | A pale streak appearing within 30 to 60 seconds after stroking the skin with a fingernail, and lasting for several minutes; regarded as a sign of diminished arterial tension. Synonym: Sergent's white line. (05 Mar 2000) |
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| Hunter's line | A fibrous band running vertically the entire length of the centre of the anterior abdominal wall, receiving the attachments of the oblique and transverse abdominal muscles. Synonym: Hunter's line, white line. (05 Mar 2000) |
| Shenton's line | A curved line formed by the top of the obturator foramen and the inner side of the neck of the femur, seen on an anteroposterior frontal radiograph of a normal hip joint; it is disturbed in lesions of the joint such as dislocation or fracture. (05 Mar 2000) |
| S-N line | A line connecting a point (S) representing the centre of the sella turcica with the frontonasal junction (N); it denotes the anterior portion of the cranial base in cephalometrics. (05 Mar 2000) |
| soleal line | A ridge which extends obliquely downward and medially across the back of the tibia from the fibular articular facet; it gives origin to the soleus muscle. Synonym: linea musculi solei, line for soleus muscle, linea poplitea, popliteal line. (05 Mar 2000) |
| Spigelius' line | The slight groove in the external abdominal wall parallel to the lateral edge of the rectus sheath. Synonym: semilunar line, Spigelius' line. (05 Mar 2000) |
| spiral line | A rough line that separates the neck and shaft of the femur anteriorly; it passes downward and medially from the greater trochanter to the lesser trochanter and continues into the medial lip of the linea aspera. Synonym: linea intertrochanterica, linea spiralis, spiral line. (05 Mar 2000) |
| stabilizing fulcrum line | An imaginary line connecting occlusal rests, around which line the denture tends to rotate under masticatory force. (05 Mar 2000) |
| nasobasilar line | A line connecting the basion and the nasion. Synonym: nasobasilar line. (05 Mar 2000) |
| Nelaton's line | A line drawn from the anterior superior iliac spine to the tuberosity of the ischium; normally the great trochanter lies in this line, but in cases of iliac dislocation of the hip or fracture of the neck of the femur the trochanter is felt above the line. Synonym: Roser-Nelaton line. (05 Mar 2000) |
| neonatal line | In deciduous teeth, a line of demarcation between prenatal and postnatal enamel. Synonym: neonatal ring. (05 Mar 2000) |
| sternal line | A vertical line corresponding to the lateral margin of the sternum. Synonym: linea sternalis. (05 Mar 2000) |
| 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) |