| MRO | master reference oscillator; medical review officer; minimal recognizable odor; muscle receptor orga... |
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| MRT | magnetic resonance tomography; maximum relaxation time; median range score; median reaction time; me... |
| MSA | major serologic antigen; male-specific antigen; mannitol salt agar; Medical Services Administration;... |
| MSE | medical support equipment; mental status examination; muscle-specific enolase |
| msp | muscle spasm |
| inferior part of vestibular ganglion | The lower part of the vestibular ganglion that receives fibres from the macula of the saccule and the ampulla of the posterior saemicircular duct. Synonym: pars inferior ganglii vestibularis. (05 Mar 2000) |
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| inferior part of vestibulocochlear nerve | <anatomy, nerve> The cochlear part of the acoustic (8th cranial) nerve. The cochlear nerve fibres originate from neurons of the spiral ganglion and project peripherally to cochlear hair cells and centrally to the cochlear nuclei of the brainstem. They mediate the sense of hearing. (12 Dec 1998) |
| inferior surface of petrous part of temporal bone | Inferior surface of petrous part of the temporal bone; the portion of the petrous part of the temporal bone that contributes to the external base of the skull. Synonym: facies inferior partis petrosae ossis temporalis. (05 Mar 2000) |
| infraclavicular part of brachial plexus | The part of the brachial plexus that extends from the level of the clavicle downward into the axilla; it includes the cords of the plexus and their branches. Synonym: pars infraclavicularis plexus brachialis. (05 Mar 2000) |
| infralobar part of posterior branch of right pulmonary vein | <anatomy, vein> The vein draining the posterior segment of the right lung that emerges inferior to the superior lobe; tributary to the posterior branch of the right superior pulmonary vein. Synonym: pars infralobaris rami posterioris venae pulmonalis dextrae. (05 Mar 2000) |
| infrasegmental part | A vein receiving blood from adjacent bronchopulmonary segments; it emerges from the inferior margin of a segment to become a tributary of a branch of a pulmonary vein. Synonym: infrasegmental part, intersegmental part of pulmonary vein, pars infrasegmentalis. (05 Mar 2000) |
| infundibular part | <anatomy> The upward extension of the anterior lobe that wraps around the infundibular stalk; its cells, mostly gonadotropic, are arranged in cords and clusters; it is supplied by the superior hypophyseal arteries and contains the first capillary bed and the venules of a portal system that carries neurosecretory factors from the hypothalamus to a second capillary bed in the adenohypophysis where they regulate the release of hormones. See: hypophysis. Synonym: infundibular part, pars infundibularis. (05 Mar 2000) |
| insular part | insular part |
| insular part of middle cerebral artery | insular part of middle cerebral artery |
| intercartilaginous part of glottic opening | The opening between the vocal processes of the arytenoid cartilages. Synonym: pars intercartilaginea rimae glottidis, glottis respiratoria, intercartilaginous part of glottic opening. (05 Mar 2000) |
| intercartilaginous part of rima glottidis | The opening between the vocal processes of the arytenoid cartilages. Synonym: pars intercartilaginea rimae glottidis, glottis respiratoria, intercartilaginous part of glottic opening. (05 Mar 2000) |
| intermediate part | Central portion; the portion located between extreme portions of a structure; an interposed or intervening part. See: intermediate part of adenohypophysis, intermediate part of vestibular bulb. Synonym: pars intermedia. (05 Mar 2000) |
| intermediate part of adenohypophysis | The part of the adenohypophysis located between the pars distalis and the nervous lobe; poorly developed in humans. Synonym: pars intermedia adenohypophyseos. (05 Mar 2000) |
| intermediate part of vestibular bulb | A narrow median band that connects the two masses of erectile tissue (the bulbus vestibuli) on either side of the vaginal orifice. Synonym: pars intermedia commissura bulborum, commissura bulborum, intermediate part of vestibular bulb, pars intermedia bulborum. (05 Mar 2000) |
| intermembranous part of glottic opening | The portion of the opening anterior to the vocal processes of the arytenoid cartilages bounded by the vocal ligaments. Synonym: pars intermembranacea rimae glottidis, glottis vocalis, intermembranous part of glottic opening. (05 Mar 2000) |