| PILBD | paucity of interlobular bile ducts |
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| saemicircular ducts | Three small membranous tubes in the bony saemicircular canals that lie within the bony labyrinth and form loops of about two-thirds of a circle. The three (anterior saemicircular duct, lateral saemicircular duct, and posterior saemicircular duct) lie in planes at right angles to each other and open into the vestibule by five openings of which one is common to the anterior and lateral ducts. Each duct has an ampulla at one end within which filaments of the vestibular nerve terminate. Synonym: ductus saemicirculares. (05 Mar 2000) |
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| ampulla of the saemicircular ducts | A nearly spherical enlargement of one end of each of the three saemicircular ducts, anterior, posterior, and lateral, where they connect with the utricle. Each contains a neuroepithelial crista ampullaris. Synonym: ampulla membranacea, membranous ampulla. (05 Mar 2000) |
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| ampullary crura of saemicircular ducts | The dilated ends of the three saemicircular ducts, each of which contains a specialised thickening of the epithelium known as the ampullary crest. Synonym: crura membranacea ampullaria ductus saemicircularis, ampullary limbs of saemicircular ducts. (05 Mar 2000) |
| ampullary limbs of saemicircular ducts | The dilated ends of the three saemicircular ducts, each of which contains a specialised thickening of the epithelium known as the ampullary crest. Synonym: crura membranacea ampullaria ductus saemicircularis, ampullary limbs of saemicircular ducts. (05 Mar 2000) |
| common crus of saemicircular ducts | The united, nonampullary ends of the superior and posterior saemicircular ducts. Synonym: crus membranaceum commune ductus saemicircularis, common limb of membranous saemicircular ducts. (05 Mar 2000) |
| common limb of membranous saemicircular ducts | The united, nonampullary ends of the superior and posterior saemicircular ducts. Synonym: crus membranaceum commune ductus saemicircularis, common limb of membranous saemicircular ducts. (05 Mar 2000) |
| ampulla of the saemicircular canals | A circumscribed dilation of one extremity of each of the three bony saemicircular canals, anterior, posterior, and lateral; each contains an ampulla of the saemicircular ducts. Synonym: ampulla ossea, osseous ampulla. (05 Mar 2000) |
| anterior saemicircular canals | The three bony tubes in the labyrinth of the ear within which the membranous saemicircular ducts are located; they lie in planes at right angles to each other and are known as anterior saemicircular canal, posterior saemicircular canal, and lateral saemicircular canal. Synonym: canales saemicirculares ossei. (05 Mar 2000) |
| basal lamina of saemicircular duct | The basal membrane underlying the epithelium of the saemicircular duct. Synonym: membrana basalis ductus saemicircularis, basal lamina of saemicircular duct. (05 Mar 2000) |
| basal membrane of saemicircular duct | The basal membrane underlying the epithelium of the saemicircular duct. Synonym: membrana basalis ductus saemicircularis, basal lamina of saemicircular duct. (05 Mar 2000) |
| bony saemicircular canals | The three bony tubes in the labyrinth of the ear within which the membranous saemicircular ducts are located; they lie in planes at right angles to each other and are known as anterior saemicircular canal, posterior saemicircular canal, and lateral saemicircular canal. Synonym: canales saemicirculares ossei. (05 Mar 2000) |
| posterior saemicircular canals | The three bony tubes in the labyrinth of the ear within which the membranous saemicircular ducts are located; they lie in planes at right angles to each other and are known as anterior saemicircular canal, posterior saemicircular canal, and lateral saemicircular canal. Synonym: canales saemicirculares ossei. (05 Mar 2000) |
| crura of bony saemicircular canals | The extremities of the bony saemicircular canals in which the corresponding membranous limbs of the saemicircular ducts are located; they are the common bony crus, simple bony crus, and ampullary bony crus. Synonym: crura ossea canalium saemicircularium, limbs of bony saemicircular canals. (05 Mar 2000) |
| saemicircular | Forming a half circle or an incomplete circle. Synonym: semiorbicular. (05 Mar 2000) |
| saemicircular canals | Three long canals (anterior, posterior, and lateral) of the labyrinth. They are set at right angles to each other and are situated superior and posterior to the vestibule. (12 Dec 1998) |
| saemicircular line | A crescentic line, not always clearly defined, which marks the lower limit of the posterior layer of the sheath of the rectus abdominis muscle. Synonym: linea arcuata vaginae musculi recti abdominis, Douglas' line, linea saemicircularis, saemicircular line. (05 Mar 2000) |
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