| membrana nictitans | The semilunar fold formed by the palpebral conjunctiva at the medial angle of the eye, a fold of the conjunctival mucous membrane found in many animals; normally partially hidden in the medial canthus of the eye when at rest, it may be extended to cover part or all of the cornea in a winking-like action to clean the cornea, as in birds. Synonym: membrana nictitans, nictitating membrane, palpebra III, palpebra tertia, third eyelid. Synonym: plica lunata, plica semilunaris of eye, semilunar conjunctival fold. (05 Mar 2000) |
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| membrana obturatoria | The thin membrane of strong interlacing fibres filling the obturator foramen. Synonym: membrana obturatoria. (05 Mar 2000) |
| membrana perinei | The layer of fascia extending between the ischiopubic rami inferior to the sphincter urethrae and the deep transverse perineal muscles. Synonym: membrana perinei, fascia diaphragmatis urogenitalis inferior, Camper's ligament, ligamentum triangulare, perineal membrane, triangular ligament. (05 Mar 2000) |
| membrana pituitosa | The mucous membrane lining the nasal cavity. (12 Dec 1998) |
| membrana preformativa | The thickened membrana formed by fusion of Korff's fibres and the basement membrane of the ameloblasts in a developing tooth. (05 Mar 2000) |
| membrana propria ductus saemicircularis | The meshwork of connective tissue fibres between the saemicircular duct and the bony saemicircular canal; it encloses the perilymph in its spaces. Synonym: membrana propria ductus saemicircularis. (05 Mar 2000) |
| membrana pupillaris | Remnants of the central portion of the anterior layer of the iris stroma (the iridopupillary lamina) which occludes the pupil in foetal life, and normally atrophies about the seventh month of gestation. Persistent strands usually stretch across the pupil from one iris collarette to the other, without touching the pupillary margin. Failure to regress is a rare cause of congenital blindness. Synonym: membrana pupillaris, Wachendorf's membrane. (05 Mar 2000) |
| membrana quadrangularis | The elastic fibra membrane that extends from the ventricular fold of the larynx upward to the aryepiglottic fold; it attaches anteriorly to the epiglottis and posteriorly to the lateral margin of the arytenoid and corniculate cartilages. Synonym: membrana quadrangularis, Tourtual's membrane. (05 Mar 2000) |
| membrana reticularis | The membrane formed by cuticular plates of the cells of the spiral organ of Corti; it appears netlike when viewed from above. Synonym: membrana reticularis. (05 Mar 2000) |
| membrana serosa | serosa, chorion |
| membrana serotina | An obsolete synonym of decidua basalis. (05 Mar 2000) |
| membrana spiralis | An alternate term for tympanic wall of cochlear duct, tympanic wall of cochlear duct. (05 Mar 2000) |
| membrana stapedis | The delicate mucosal layer that bridges the space between the crura and base of the stapes. Synonym: membrana stapedis. (05 Mar 2000) |
| membrana statoconiorum | A gelatinous membrane supported by the hairs of the hair cells of the maculae of the saccule and utriculus of the inner ear; adhering to the surface are numerous crystalline particles called statoconia. Synonym: membrana statoconiorum, otolithic membrane. (05 Mar 2000) |
| membrana sterni | Interlacing fibres from the anterior costosternal ligaments covering the anterior surface of the sternum. Synonym: membrana sterni. (05 Mar 2000) |