| nodus ligamenti arteriosi | A lymph node of the anterior mediastinal group located adjacent to the ligamentum arteriosum. Synonym: nodus ligamenti arteriosi, lymph node of ligamentum arteriosum. (05 Mar 2000) |
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| nodus lymphaticus | Synonym: lymph node. Origin: Lympho-+ L. Nodus, node (05 Mar 2000) |
| nodus malaris | One of the facial lymph nodes located near the zygomatic minor muscle. Synonym: nodus malaris, malar node. (05 Mar 2000) |
| nodus mandibularis | One of the facial lymph nodes located by the facial artery near the point it crosses the mandible. Synonym: nodus mandibularis, mandibular nodes. (05 Mar 2000) |
| nodus nasolabialis | One of the facial lymph nodes located near the junction of the superior labial and facial arteries. Synonym: nodus nasolabialis, nasolabial node. (05 Mar 2000) |
| nodus rectalis medius | A lymph node along the middle rectal artery that receives afferents from the pararectal nodes and sends efferents to the internal iliac nodes. Synonym: middle rectal node, nodus rectalis medius. (05 Mar 2000) |
| nodus sinuatrialis | sinoatrial node |
| nodus sinuatrialis echo | A postectopic sinus beat occurring earlier than would be expected from the preceding sinus node discharge interval; i.e., the interval following a premature beat of supraventricular origin is less than the ordinary cycle length between sinus beats, whereas ordinarily the interval would be expected to exceed cycle length. (05 Mar 2000) |
| nodus suprapyloricus | A lymph node located above the pylorus. Synonym: nodus suprapyloricus, suprapyloric node. (05 Mar 2000) |
| nodus tibialis anterior | A small inconstant lymph node in front of the interosseous membrane along the upper part of the anterior tibial vessels. Synonym: nodus tibialis anterior, anterior tibial node. (05 Mar 2000) |
| nodus tibialis posterior | A small inconstant lymph node located along the course of the posterior tibial artery. Synonym: nodus tibialis posterior, posterior tibial node. (05 Mar 2000) |
| nonreset nodus sinuatrialis | Nonreset of the sinoatrial node produced by a premature atrial depolarisaton when the sum of the duration of the premature cycle and the return cycle is fully compensatory, i.e., twice the duration of the spontaneous cycle length. Compare: reset nodus sinuatrialis. (05 Mar 2000) |
| arcus | Synonym: arch. Origin: L. A bow (05 Mar 2000) |
| arcus adiposus | 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) |
| arcus alveolaris mandibulae | The free margin of the alveolar process of the mandible. Synonym: arcus alveolaris mandibulae, limbus alveolaris. (05 Mar 2000) |