| thoracic ganglia | Ganglia, 11 or 12 on either side, at the level of the head of each rib, constituting with the interganglionic rami the thoracic portion of the sympathetic trunk. Synonym: ganglia thoracica. (05 Mar 2000) |
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| extracranial ganglia | <anatomy, nerve> The lower of two sensory ganglion's on the glossopharyngeal nerve as it traverses the jugular foramen. Synonym: ganglion inferius nervi glossopharyngei, Andersch's ganglion, extracranial ganglia, ganglion extracraniale, petrosal ganglion, petrous ganglion. (05 Mar 2000) |
| lumbar ganglia | Four or more ganglia on the medial border of the psoas major muscle on either side; they form, with the sacral and coccygeal ganglia and their interganglionic rami, the abdominopelvic sympathetic trunk. Synonym: ganglia lumbalia. (05 Mar 2000) |
| accessory | In anatomy, denoting certain muscles, nerves, glands, etc. That are auxiliary or supernumerary to some similar, generally more important thing. Synonym: accessorius. Origin: L. Accessorius, fr. Ac-cedo, pp. -cessus, to move toward (05 Mar 2000) |
| accessory adrenal | An island of cortical tissue separate from the adrenal gland, usually found in the retroperitoneal tissues, kidney, or genital organs. Synonym: adrenal rest. (05 Mar 2000) |
| accessory atrium | <cardiology, embryology> A congenital anomaly characterised by the presence in the atrium of a perforated muscular membrane which separates the atrium into upper and lower chambers. (12 Dec 1998) |
| accessory auricles | Small, fleshy nodules or folds, sometimes with supporting cartilage, occasionally found along the margins of the embryonic branchial clefts. (05 Mar 2000) |
| accessory breast | A milk-secreting gland located elsewhere than at the normal place on the chest and existing in addition to the two usual mammae. Synonym: mamma accessoria, accessory breast, supernumerary mamma. (05 Mar 2000) |
| accessory canal | A channel leading from the root pulp laterally through the dentin to the periodontal tissue; may be found anywhere in the tooth root, but is more common in the apical third of the root. Synonym: lateral canal. (05 Mar 2000) |
| accessory cartilage | A sesamoid cartilage. (05 Mar 2000) |
| accessory cephalic vein | <anatomy, vein> A variable vein that passes along the radial border of the forearm to join the cephalic vein near the elbow. Synonym: vena cephalica accessoria. (05 Mar 2000) |
| accessory chromosome | A chromosome existing without its normal homologous chromosome; at the reduction division of gametogenesis an accessory chromosome is likely to be included in one daughter cell and not in the other, but may be lost completely by lagging behind on the equatorial plate. Synonym: monosome, odd chromosome, unpaired allosome, unpaired chromosome. (05 Mar 2000) |
| accessory cramp | <neurology> A wry neck, a contracted state of the cervical muscles, producing twisting of the neck and an unnatural position of the head. Origin: L. Tortus = twisted, collum = neck (18 Nov 1997) |
| accessory cuneate nucleus | A cell group lateral to the cuneate nucleus which receives posterior-root fibres corresponding to the proprioceptive innervation of the arm and hand; it projects to the cerebellum by way of the cuneocerebellar tract, and can be considered the upper-extremity equivalent of the thoracic nucleus. Synonym: nucleus cuneatus accessorius, external cuneate nucleus, lateral cuneate nucleus, Monakow's nucleus. (05 Mar 2000) |
| accessory flexor muscle of foot | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |