| LAS | laboratory automation system; lateral amyotrophic sclerosis; laxative abuse syndrome; left anterior-... |
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| LASH | left anterior superior hemiblock |
| LSR | lanthanide shift reagent; lecithin/ sphingomyelin ratio; left superior rectus [muscle]; liver/spleen... |
| LSVC | left superior vena cava |
| MSO | management service organization; medial superior olive; medical staff organization |
| lesser pancreas | A portion of the head of the pancreas that hooks around posterior to the superior mesenteric vessels, sometimes into the "nutcracker" formed by the superior mesenteric artery and abdominal aorta. Synonym: processus uncinatus pancreatis, lesser pancreas, pancreas minus, small pancreas, uncinate pancreas, unciform pancreas, Willis' pancreas, Winslow's pancreas. (05 Mar 2000) |
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| lesser pelvis | The cavity of the pelvis below the brim or superior aperture. Synonym: pelvis minor, pelvis vera, small pelvis, true pelvis. (05 Mar 2000) |
| lesser peritoneal cavity | <anatomy> An isolated portion of the peritoneal cavity lying dorsal to the stomach and extending craniad to the liver and diaphragm and caudad into the greater omentum; it opens into the general peritoneal cavity at the epiploic foramen. Synonym: bursa omentalis, lesser peritoneal cavity, lesser peritoneal sac, omental sac. (05 Mar 2000) |
| lesser peritoneal sac | <anatomy> An isolated portion of the peritoneal cavity lying dorsal to the stomach and extending craniad to the liver and diaphragm and caudad into the greater omentum; it opens into the general peritoneal cavity at the epiploic foramen. Synonym: bursa omentalis, lesser peritoneal cavity, lesser peritoneal sac, omental sac. (05 Mar 2000) |
| lesser rhomboid muscle | <anatomy, muscle> Origin, spinous processes of sixth and seventh cervical vertebrae; insertion, medial margin of scapula above spine; action, draws scapula toward vertebral column and slightly upward; nerve supply, dorsal nerve of scapula. Synonym: musculus rhomboideus minor, lesser rhomboid muscle. (05 Mar 2000) |
| lesser ring of iris | The narrow inner zone of the iris. Synonym: annulus iridis minor. (05 Mar 2000) |
| lesser sciatic notch | The notch in the posterior border of the ischium below the ischial spine. Synonym: incisura ischiadica minor. (05 Mar 2000) |
| Lesser's triangle | The space between the bellies of the digastric muscle and the hypoglossal nerve. (05 Mar 2000) |
| lesser supraclavicular fossa | A triangular space between the two heads of origin of the sternocleidomastoid muscle. Synonym: fossa supraclavicularis minor. (05 Mar 2000) |
| lesser trochanter | A pyramidal process projecting from the medial and proximal part of the shaft of the femur at the line of junction of the shaft and the neck; it receives the insertion of the psoas major and iliacus (iliopsoas) muscles. Synonym: trochanter minor, small trochanter, trochantin. (05 Mar 2000) |
| lesser tubercle of humerus | The anterior of the two tubercles of the neck of the humerus on which the subscapularis is inserted. Synonym: tuberculum minus humeri, lesser tuberosity of humerus. (05 Mar 2000) |
| lesser tuberosity of humerus | The anterior of the two tubercles of the neck of the humerus on which the subscapularis is inserted. Synonym: tuberculum minus humeri, lesser tuberosity of humerus. (05 Mar 2000) |
| lesser tympanic spine | The posterior edge of the tympanic notch (of Rivinus). Synonym: spina tympanica minor. (05 Mar 2000) |
| lesser vestibular glands | A number of minute mucous glands opening on the surface of the vestibule between the orifices of the vagina and urethra. Synonym: glandulae vestibulares minores. (05 Mar 2000) |
| lesser wing of sphenoid bone | One of a bilateral pair of triangular, pointed plates extending laterally from the anterolateral body of the sphenoid bone. Forming the posteriormost portion of the floor of the anterior cranial fossa, their sharp posterior edge forms the sphenoidal ridge separating anterior and middle cranial fossae. The medial end of the lesser wing attaches to the body by means of two pedicles, thus forming the optic canal. The wing itself forms the superior margin of the supraorbital fissure. Synonym: ala minor ossis sphenoidalis, ala orbitalis, Ingrassia's apophysis, Ingrassia's wing. (05 Mar 2000) |