| linea arcuata ossis ilii | The iliac portion of the linea terminalis of the bony pelvis. Synonym: linea arcuata ossis ilii. (05 Mar 2000) |
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| linea arcuata vaginae musculi recti abdominis | 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) |
| linea aspera | A rough ridge with two pronounced lips running down the posterior surface of the shaft of the femur; the lateral lip of the linea aspera is a continuation of the gluteal tuberosity, the medial lip of the intertrochanteric line; it affords attachment to the vastus medialis, adductor longus, adductor magnus, adductor brevis, the short head of the biceps, and the vastus lateralis muscles as well as to the intermuscular septa of the thigh. Synonym: rough line. (05 Mar 2000) |
| linea axillaris anterior | A vertical line extending inferiorly from the anterior axillary fold. Synonym: linea axillaris anterior, linea preaxillaris, preaxillary line. (05 Mar 2000) |
| linea axillaris media | A vertical line intersecting a point midway between the anterior and posterior axillary folds or lines. Synonym: linea axillaris media, linea medio-axillaris, middle axillary line. (05 Mar 2000) |
| linea axillaris posterior | A vertical line extending inferiorly from the posterior axillary fold. Synonym: linea axillaris posterior, linea postaxillaris, postaxillary line. (05 Mar 2000) |
| linea corneae senilis | An opaque, grayish ring at the periphery of the cornea just within the sclerocorneal junction, of frequent occurrence in the aged; it results from a deposit of fatty granules in, or hyaline degeneration of, the lamellae and cells of the cornea. Synonym: anterior embryotoxon, arcus adiposus, arcus juvenilis, arcus lipoides, arcus senilis, gerontoxon, linea corneae senilis, lipoidosis corneae. (05 Mar 2000) |
| linea epiphysialis | The line of junction of the epiphysis and diaphysis of a long bone where growth in length occurs. Synonym: linea epiphysialis, synchondrosis epiphyseos. (05 Mar 2000) |
| linea intercondylaris femoris | A faint transverse ridge separating the floor of the intercondylar fossa from the popliteal surface of the femur; it affords attachment to the posterior portion of the articular capsule of the knee. Synonym: linea intercondylaris femoris. (05 Mar 2000) |
| linea intermedia cristae iliacae | The line on the crest of the ilium between the outer and inner lips, for origin of internal oblique muscle. Synonym: linea intermedia cristae iliacae. (05 Mar 2000) |
| linea interspinalis | Line passing through both anterior superior iliac spines indicating the interspinal plane. Synonym: linea interspinalis. (05 Mar 2000) |
| linea intertrochanterica | 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) |
| linea intertubercularis | Line passing through tubercles of both iliac crests, indicating the intertubercular plane. Synonym: linea intertubercularis. (05 Mar 2000) |
| linea mamillaris | A vertical line passing through the nipple on either side. Synonym: linea mamillaris, nipple line. (05 Mar 2000) |
| 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) |