| membranous ampulla | 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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| membranous cataract | A secondary cataract composed of the remains of the thickened capsule and degenerated lens fibres. (05 Mar 2000) |
| membranous cochlea | Spiral tube in the bony canal of the cochlea, lying on its outer wall between the scala vestibuli and scala tympani. (12 Dec 1998) |
| membranous conjunctivitis | A severe conjunctival inflammation caused by Corynebacterium diphtheriae and characterised by an infiltrating membrane which on removal leaves a raw surface. Synonym: membranous conjunctivitis. (05 Mar 2000) |
| membranous dysmenorrhoea | Dysmenorrhoea accompanied by an exfoliation of the menstrual decidua. (05 Mar 2000) |
| membranous glomerulonephritis | <pathology> A kidney disease that occurs due to inflammation of the kidney glomerulus and its basement membrane. The exact cause is unknown but it appears to be related to the deposition of immune complexes in the basement membrane leading to thickening of the capillary walls. This disorder is a common cause of nephrotic syndrome an is usually how the disease manifests. Risk factors include primary renal disease, malaria, hepatitis B, lupus, syphilis, cancers and non-Hodgkin's lymphomas. Risks also include exposure to some medications such as gold compounds and penicillamine. Mercury, trimethadione and some skin-lightening creams have also been implicated. Treatment includes systemic corticosteroids and immunosuppressive agents. (26 Mar 1998) |
| membranous labyrinth | A complex arrangement of communicating membranous canaliculi and sacs, filled with endolymph and surrounded by perilymph, suspended within the cavity of the bony labyrinth; its chief divisions are the cochlear labyrinth and the vestibular labyrinth. Synonym: labyrinthus membranaceus. (05 Mar 2000) |
| membranous lamina of cartilaginous auditory tube | The connective tissue membrane that, with the lateral lamina, completes the lateral and inferior walls of the cartilaginous part of the auditory tube. Synonym: lamina membranacea cartilaginis tubae auditivae, membranous layer. (05 Mar 2000) |
| membranous laryngitis | A form in which there is a pseudomembranous exudate on the vocal cords. (05 Mar 2000) |
| membranous layer | The connective tissue membrane that, with the lateral lamina, completes the lateral and inferior walls of the cartilaginous part of the auditory tube. Synonym: lamina membranacea cartilaginis tubae auditivae, membranous layer. (05 Mar 2000) |
| membranous layer of superficial fascia | The membranous layer of the subcutaneous tissue in the urogenital region attaching posteriorly to the border of the urogenital diaphragm, at the sides to the ischiopubic rami, and continuing anteriorly onto the abdominal wall. Synonym: fascia perinei superficialis, Colles' fascia, Cruveilhier's fascia, membranous layer of superficial fascia. (05 Mar 2000) |
| membranous lipodystrophy | A rare metabolic disease in which bone marrow fat cells are transformed into thick convoluted PAS-staining membranes enclosing weakly osmophilic material; leads to progressive cystic resorption of limb bones and dementia with sudanophilic leukodystrophy. (05 Mar 2000) |
| membranous nephropathy | <pathology> A kidney disease that occurs due to inflammation of the kidney glomerulus and its basement membrane. The exact cause is unknown but it appears to be related to the deposition of immune complexes in the basement membrane leading to thickening of the capillary walls. This disorder is a common cause of nephrotic syndrome an is usually how the disease manifests. Risk factors include primary renal disease, malaria, hepatitis B, lupus, syphilis, cancers and non-Hodgkin's lymphomas. Risks also include exposure to some medications such as gold compounds and penicillamine. Mercury, trimethadione and some skin-lightening creams have also been implicated. Treatment includes systemic corticosteroids and immunosuppressive agents. (26 Mar 1998) |
| membranous neurocranium | The vault of the embryonic skull which is ossified in membrane. (05 Mar 2000) |
| membranous part of interventricular septum | Part of the fibrous skeleton of the heart which is seen as a small, thin, round or oval nonmuscular area at the superior end of the interventricular septum; it lies just below and is continuous with the portion of the fibrous ring of the aortic valve supporting the anterior and posterior cusps, and with the right fibrous trigone; the atrioventricular bundle of conducting tissue courses along its dorsal margin and bifurcates at its inferior margin into the right and left crura. Synonym: pars membranacea septi interventricularis, membranous septum, septum membranaceum ventriculorum. (05 Mar 2000) |