| BI | background interval; bacterial or bactericidal index; base-in [prism]; basilar impression; Billroth ... |
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| BM | Bachelor of Medicine; barium meal; basal medium; basal metabolism; basement membrane; basilar membra... |
| BMA | bone marrow arrest; British Medical Association |
| BMAP | bone marrow acid phosphatase |
| BMB | biomedical belt; bone marrow biopsy |
| greater multangular bone | Origin: NL, fr. Gr. A little table, an irregular four-sided figure, dim. Of a table, for; (see Tetra-) + foot, akin to foot; hence, originally, a table with four feet. See Foot. 1. <geometry> A plane figure bounded by four right lines, of which no two are parallel. 2. <anatomy> A bone of the carpus at the base of the first metacarpal, or thumb. A region on the ventral side of the brain, either just back of the pons Varolii, or, as in man, covered by the posterior extension of its transverse fibres. Source: Websters Dictionary (01 Mar 1998) |
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| greater wing of sphenoid bone | 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) |
| rider's bone | Heterotopic bone ossification of the tendon of the adductor longus muscle from strain in horseback riding. Synonym: cavalry bone, exercise bone. (05 Mar 2000) |
| metacarpal bone | One of the metacarpal bones, five long bones (numbered I to V, beginning with the bone on the radial or thumb side) forming the skeleton of the metacarpus or palm; they articulate with the bones of the distal row of the carpus and with the five proximal phalanges. Synonym: os metacarpale. (05 Mar 2000) |
| peroneal bone | A long bone in the lower leg that is adjacent to the tibia. The fibula supports approximately 1/6th of the body weight and produces the lateral (outer) prominence of the ankle. (27 Sep 1997) |
| perpendicular plate of ethmoid bone | A thin plate of bone projecting downward from the crista galli of the ethmoid; it forms part of the nasal septum. Synonym: lamina perpendicularis ossis ethmoidalis. (05 Mar 2000) |
| perpendicular plate of palatine bone | The part of the palatine bone that extends vertically upward from the horizontal lamina; it forms part of the lateral wall of the nasal cavity. Synonym: lamina perpendicularis ossis palatini. (05 Mar 2000) |
| metatarsal bone | One of the metatarsal bones; the five long bones numbered I to V beginning with the bone on the medial side forming the skeleton of the anterior portion of the foot, articulating posteriorly with the three cuneiform and the cuboid bones, anteriorly with the five proximal phalanges. Synonym: os metatarsale. (05 Mar 2000) |
| petrosal bone | The part of the temporal bone that contains the structures of the inner ear and the second part of the internal carotid artery; in antenatal life it appears as a separate ossification centre. Synonym: pars petrosa ossis temporalis, periotic bone, petrosal bone, petrous pyramid. (05 Mar 2000) |
| petrous bone | <anatomy, artery> The part of the internal carotid artery in the carotid canal; its branches are carotidotympanic arteries and the artery of the pterygoid canal. Synonym: pars petrosa arteriae carotidis internae, petrous bone. (05 Mar 2000) |
| petrous part of temporal bone | The part of the temporal bone that contains the structures of the inner ear and the second part of the internal carotid artery; in antenatal life it appears as a separate ossification centre. Synonym: pars petrosa ossis temporalis, periotic bone, petrosal bone, petrous pyramid. (05 Mar 2000) |
| rostrum of the sphenoid bone | The anterior projecting part of the body of the sphenoid bone which articulates with the vomer. Synonym: rostrum sphenoidale. (05 Mar 2000) |
| middle cuneiform bone | A bone of the distal row of the tarsus; it articulates with the medial and lateral cuneiform, navicular, and second metatarsal bones. Synonym: os cuneiforme intermedium, mesocuneiform, middle cuneiform bone, second cuneiform bone, wedge bone. (05 Mar 2000) |
| middle turbinated bone | The middle thin, spongy, bony plate with curved margins, part of the ethmoidal labyrinth, projecting from the lateral wall of the nasal cavity and separating the superior meatus from the middle meatus, the above bony plate and its thick mucoperiosteum containing a cavernous vascular bed for heat exchange. Synonym: concha nasalis media, middle turbinated bone, turbinated body. (05 Mar 2000) |
| coccygeal bone | <anatomy> The last bone of the spinal column, sometimes referred to as man's vestigial tail. The last portion of the vertebral column just below the sacrum. (27 Sep 1997) |