| ASS | acute serum sickness; acute spinal stenosis; anterior superior spine; argininosuccinate synthetase |
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| CSMAP | celiac-superior mesenteric artery portography |
| LAS | laboratory automation system; lateral amyotrophic sclerosis; laxative abuse syndrome; left anterior-... |
| LASH | left anterior superior hemiblock |
| LSR | lanthanide shift reagent; lecithin/ sphingomyelin ratio; left superior rectus [muscle]; liver/spleen... |
| superior gingival branches of superior dental plexus | Branches of superior dental plexus to gingiva of upper jaw. Synonym: rami gingivales superiores plexus dentalis superioris. (05 Mar 2000) |
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| superior lingular branch of lingular branch of superior lobar left pulmonary artery | <anatomy, artery> Branch (of the lingular branch) of the left pulmonary artery serving the superior lingular segment of the superior lobe of the left lung. Synonym: ramus lingularis superior. (05 Mar 2000) |
| ala major ossis sphenoidalis | Strong squamous processes extending in a broad superolateral curve from the body of the sphenoid bone. The greater wing presents these suraces (facies): 1) cerebral surface: forms anterior third of the floor of the lateral portions of the middle cranial fossa; 2) temporal surface: forms the deepest portion of the temporal fossa; 3) infratemporal surface, forms the "roof" of the infratemporal fossa; 4) orbital surface: forms posterolateral wall of orbit. The greater wing forms the inferior border of the supraorbital fissure, and is perforated at its root by foramina rotundum ovale, and spinosum and the pterygoid canal. Synonym: ala major ossis sphenoidalis, ala temporalis. (05 Mar 2000) |
| ala minor ossis sphenoidalis | 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) |
| ala ossis ilii | The upper flaring portion of the ilium. Synonym: ala ossis ilii. (05 Mar 2000) |
| angulus frontalis ossis parietalis | The anterior superior angle of the parietal bone. Synonym: angulus frontalis ossis parietalis. (05 Mar 2000) |
| angulus mastoideus ossis parietalis | The posteroinferior point of the parietal bone. Synonym: angulus mastoideus ossis parietalis. (05 Mar 2000) |
| angulus occipitalis ossis parietalis | An angle formed by the junction, at the opisthion, of lines coming from the basion and from the projection in the median plane of the lower border of the orbits. See: Daubenton's line, Daubenton's plane. Synonym: angulus occipitalis ossis parietalis, occipital angle of parietal bone. (05 Mar 2000) |
| angulus sphenoidalis ossis parietalis | The anterior inferior angle of the parietal bone. Synonym: angulus sphenoidalis ossis parietalis, sphenoid angle, sphenoidal angle, Welcker's angle. (05 Mar 2000) |
| apex ossis sacri | The tapering lower end of the sacrum that articulates with the coccyx. Synonym: apex ossis sacri. (05 Mar 2000) |
| apex partis petrosae ossis temporalis | The irregular antero-medial extremity of the petrous part on which the anterior end of the carotid canal opens. Synonym: apex partis petrosae ossis temporalis. (05 Mar 2000) |
| articulatio ossis pisiformis | The synovial joint between the pisiform and triquetrum; it is separate from the other intercarpal joints. Synonym: articulatio ossis pisiformis, articulation of pisiform bone. (05 Mar 2000) |
| basis ossis metacarpalis | The expanded proximal extremity of each metacarpal that articulates with one or more of the distal row of carpal bones. Synonym: basis ossis metacarpalis. (05 Mar 2000) |
| basis ossis metatarsalis | The expanded proximal extremity of each metatarsal bone; it articulates with one or more of the distal row of tarsal bones. Synonym: basis ossis metatarsalis. (05 Mar 2000) |
| basis ossis sacri | The upper end of the sacrum that articulates with the body of the fifth lumbar vertebra in the midline and the alae on either side. Synonym: basis ossis sacri. (05 Mar 2000) |