| MCD | magnetic circular dichroism; mast-cell degranulation; mean cell diameter; mean of consecutive differ... |
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| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
| MDS | Master of Dental Surgery; maternal deprivation syndrome; medical data screening; medical data system... |
| MPD | main pancreatic duct; maximum permissible dose; mean population doubling; membrane potential differe... |
| NLD | nasolacrimal duct; necrobiosis lipoidica diabeticorum |
| sphincter of pancreatic duct | Smooth muscle sphincter of the main pancreatic duct immediately proximal to the hepatoduodenal, ampulla. Synonym: musculus sphincter ductus pancreatici, pancreatic sphincter, sphincter muscle of pancreatic duct. (05 Mar 2000) |
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| spiral fold of cystic duct | A series of crescentic folds of mucous membrane in the upper part of the cystic duct, arranged in a somewhat spiral manner. Synonym: plica spiralis ductus cystici, Amussat's valve, Heister's valve, spiral valve of cystic duct, valvula spiralis. (05 Mar 2000) |
| spiral valve of cystic duct | A series of crescentic folds of mucous membrane in the upper part of the cystic duct, arranged in a somewhat spiral manner. Synonym: plica spiralis ductus cystici, Amussat's valve, Heister's valve, spiral valve of cystic duct, valvula spiralis. (05 Mar 2000) |
| nasal duct | The passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity. Synonym: ductus nasolacrimalis, nasal duct. (05 Mar 2000) |
| nasolacrimal duct | The passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity. Synonym: ductus nasolacrimalis, nasal duct. (05 Mar 2000) |
| nasopalatine duct cyst | A cyst in or near the incisive canal, arising from proliferation of epithelial remnants of the nasopalatine duct; the most common maxillary development cyst. Synonym: median anterior maxillary cyst, nasopalatine duct cyst. (05 Mar 2000) |
| Stensen's duct | The duct of the parotid gland opening from the cheek into the vestibule of the mouth opposite the neck of the superior second molar tooth. Synonym: ductus parotideus, Blasius' duct, Stensen's duct, Steno's duct. (05 Mar 2000) |
| nephric duct | The duct of the pronephros; serves as the mesonephric duct. Synonym: nephric duct. (05 Mar 2000) |
| striated duct | A type of intralobular duct found in some salivary glands that modifies the secretory product; it derives its name from extensive infolding of the basal membrane. Synonym: salivary duct, secretory duct. (05 Mar 2000) |
| subareolar duct papillomatosis | A benign tumour which may clinically resemble Paget's disease, but which is a papillary or solid growth of columnar and myoepithelial cells producing a florid pseudoinfiltrative pattern. Synonym: adenoma of nipple, erosive adenomatosis of nipple. (05 Mar 2000) |
| subclavian duct | It is formed by the union of the vessels draining the lymph nodes of either upper limb, emptying into the thoracic duct at the root of the neck on the left or into the right lymphatic duct. Synonym: truncus subclavius, subclavian duct. (05 Mar 2000) |
| submandibular duct | The duct of the submandibular salivary gland; it opens at the sublingual papilla near the frenulum of the tongue. Synonym: ductus submandibularis, ductus submaxillaris, submaxillary duct, Wharton's duct. (05 Mar 2000) |
| submaxillary duct | The duct of the submandibular salivary gland; it opens at the sublingual papilla near the frenulum of the tongue. Synonym: ductus submandibularis, ductus submaxillaris, submaxillary duct, Wharton's duct. (05 Mar 2000) |
| sudoriferous duct | The superficial portion of the sweat gland that passes through the corium and epidermis, opening on the surface by the porus sudoriferus or sweat pore. Synonym: ductus sudoriferus, sudoriferous duct, sweat duct. (05 Mar 2000) |
| deferent duct | The secretory duct of the testicle, running from the epididymis, of which it is the continuation, to the prostatic urethra where it terminates as the ejaculatory duct. Synonym: deferent canal, deferent duct, spermatic duct, spermiduct, testicular duct, vas deferens. (05 Mar 2000) |