| linea mamillaris | A vertical line passing through the nipple on either side. Synonym: linea mamillaris, nipple line. (05 Mar 2000) |
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| linea mediana anterior | The line of intersection of the midsagittal plane with the anterior surface of the body. Synonym: linea mediana anterior. (05 Mar 2000) |
| linea mediana posterior | The line of intersection of the midsagittal plane with the posterior surface of the body. Synonym: linea mediana posterior. (05 Mar 2000) |
| linea medio-axillaris | An alternate term for midaxillary line, midaxillary line. (05 Mar 2000) |
| linea medioclavicularis | A vertical line passing through the midpoint of the clavicle. Synonym: linea medioclavicularis. (05 Mar 2000) |
| linea musculi solei | 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) |
| linea mylohyoidea | A ridge on the inner surface of the mandible running from a point inferior to the mental spine upward and backward to the ramus behind the last molar tooth; it gives attachment to the mylohyoid muscle and the lowermost part of the superior constrictor of the pharynx. Synonym: linea mylohyoidea, internal oblique line, mylohyoid ridge. (05 Mar 2000) |
| linea nigra | The linea alba in pregnancy, which then becomes pigmented. Synonym: black line. (05 Mar 2000) |
| linea nuchae inferior | A ridge that extends laterally from the external occipital crest toward the jugular process of the occipital bone. Synonym: linea nuchae inferior. (05 Mar 2000) |
| linea nuchae mediana | A ridge extending from the external occipital protuberance to the border of the foramen magnum. Synonym: crista occipitalis externa, linea nuchae mediana. (05 Mar 2000) |
| linea nuchae superior | 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) |
| linea nuchae suprema | 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) |
| linea parasternalis | A vertical line equidistant from the sternal and midclavicular lines. Synonym: linea parasternalis, costoclavicular line. (05 Mar 2000) |
| linea paravertebralis | A vertical line corresponding to the tips of the transverse processes of the vertebrae. Synonym: linea paravertebralis. (05 Mar 2000) |
| linea pectinea | A ridge running down the posterior surface of the shaft of the femur from the lesser trochanter to which the pectineus muscle attaches; continuous superiorly with intertrochanteric line and inferiorly with the medial lip of the linea aspera. Synonym: linea pectinea. (05 Mar 2000) |