| round cell sarcoma | <tumour> Old term for an undifferentiated malignant neoplasm, believed to be of mesenchymal origin, composed chiefly of closely packed round cells. (05 Mar 2000) |
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| round eminence | Longitudinal elevation of the rhomboid fossa, extending along either side of the midline throughout the length of the rhombencephalon; made up of named elevations such as the facial colliculus and the hypoglossal and vagal trigones. Synonym: eminentia medialis, eminentia teres, funiculus teres, round eminence. (05 Mar 2000) |
| round fasciculus | A slender, compact fibre bundle extending longitudinally through the dorsolateral region of the medullary tegmentum, surrounded by the nucleus of the solitary tract, below the obex decussating over the central canal, and descending over some distance into the upper cervical segments of the spinal cord. It is composed of primary sensory fibres that enter with the vagus, glossopharyngeal, and facial nerves, and in part convey information from stretch receptors and chemoreceptors in the walls of the cardiovascular, respiratory, and intestinal tracts; in rostral parts of the tract impulses are generated by the receptor cells of the taste buds in the mucosa of the tongue. Its fibres are distributed to the nucleus of the solitary tract. Synonym: tractus solitarius, fasciculus rotundus, fasciculus solitarius, funiculus solitarius, Gierke's respiratory bundle, Krause's respiratory bundle, round fasciculus, solitary bundle, solitary fasciculus. (05 Mar 2000) |
| round foramen | <anatomy> An opening in the base of the greater wing of the sphenoid bone, transmitting the maxillary nerve. Synonym: round foramen. (05 Mar 2000) |
| round heart | Abnormally smooth arcuate contours of the heart due either to disease of the ventricles or to a false cardiac appearance produced by excessive pericardial fluid. Synonym: globular heart. (05 Mar 2000) |
| round heart disease | A spontaneous cardiomyopathy of unknown aetiology that affects young turkeys; characterised by sudden death due to cardiac arrest. (05 Mar 2000) |
| round ligament | <anatomy> A fibromuscular band that attaches to the uterus and then passes along the broad ligament, out through the inguinal ring, and into the labium majus. (12 Dec 1998) |
| round ligament of elbow joint | A slender band extending from the lateral part of the coronoid process of the ulna distad and laterad to the radius immediately distal to the bicipital tuberosity. Synonym: chorda obliqua, oblique cord, round ligament of elbow joint, Weitbrecht's cord, Weitbrecht's ligament. (05 Mar 2000) |
| round ligament of femur | A flattened ligament that passes from the fovea in the head of the femur to the borders of the acetabular notch (transverse acetabular ligament); developmentally, an artery passes to the head of the femur with the ligament which may or may not persist into adulthood; the ligament does not contribute to the integrity of the joint or control movements there. Synonym: ligamentum capitis femoris, ligamentum teres femoris, round ligament of femur. (05 Mar 2000) |
| round ligament of liver | The remains of the umbilical vein running within the free edge of the falciform ligament from umbilicus to the liver, where it continues within the fissure for the round ligament to the origin of the left portal vein within the porta hepatis. Synonym: ligamentum teres hepatis. (05 Mar 2000) |
| round ligament of uterus | A fibromuscular band that is attached to the uterus on either side in front of and below the opening of the uterine tube; it passes through the inguinal canal to the labium majus; corresponds to the spermatic cord of male in that it passes through the inguinal canal and gains similar coverings, but is not homologous. Synonym: ligamentum teres uteri, Hunter's ligament. (05 Mar 2000) |
| round pelvis | An obsolete term for one in which the anteroposterior and transverse diameters are equal or the transverse diameter is not more than 1 cm longer than the anteroposterior diameter. Synonym: round pelvis. (05 Mar 2000) |
| round pneumonia | <radiology> Kids, the usual bacteria (especially pneumococcus), adults, almost always associated with immune deficiency, predominantly fungal, especially Aspergillus (12 Dec 1998) |
| round pronator muscle | <anatomy, muscle> Origin, superficial (humeral) head (ulnar) from the common flexor origin on the medial epicondyle of the humerus, deep (ulnar) head from the medial side of the coronoid process of the ulna; insertion, middle of the lateral surface of the radius; action, pronates forearm; nerve supply, median. Synonym: musculus pronator teres, musculus pronator radii teres, round pronator muscle. (05 Mar 2000) |
| notch for round ligament of liver | The notch in the inferior border of the liver that accommodates the round ligament. Synonym: incisura ligamenti teretis hepatis, incisura umbilicalis, umbilical notch. (05 Mar 2000) |