| MPM | malignant papillary mesothelioma; medial pterygoid muscle; minor psychiatric morbidity; multiple pri... |
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| MRF | Markov random field; medical record file; melanocyte-[stimulating hormone]-releasing factor; mesence... |
| MRO | master reference oscillator; medical review officer; minimal recognizable odor; muscle receptor orga... |
| 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;... |
| mitochondria, muscle | Mitochondria of skeletal and smooth muscle. It does not include myocardial mitochondria for which mitochondria, heart is available. (12 Dec 1998) |
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| physical elasticity of muscle | <anatomy> The quality of muscle that enables it to yield to passive physical stretch. (05 Mar 2000) |
| physiologic elasticity of muscle | The biologic quality, unique for muscle, of being able to change and resume size under neuromuscular control. (05 Mar 2000) |
| coccygeal muscle | <anatomy, muscle> Origin, spine of ischium and sacrospinous ligament; insertion, sides of lower part of sacrum and upper part of coccyx; action, assists in support of pelvic floor, especially when intra-abdominal pressures increase; nerve supply, third and fourth sacral. Synonym: musculus coccygeus, coccygeal muscle, musculus ischiococcygeus. (05 Mar 2000) |
| molluscan catch muscle | <biology> Muscle responsible for holding closed the two halves of the shell of bivalves. Specialise d to maintain tension with low expenditure of ATP. Rich in paramyosin. (18 Nov 1997) |
| Coiter's muscle | <anatomy, muscle> Origin, from orbital portion of musculus orbicularis oculi and nasal prominence; insertion, skin of eyebrow; action, draws medial end of eyebrow downward and wrinkles forehead vertically; nerve supply, facial. Synonym: musculus corrugator supercilii, Coiter's muscle, corrugator muscle, wrinkler muscle of eyebrow. (05 Mar 2000) |
| piriform muscle | <anatomy, muscle> Origin, margins of pelvic sacral foramina and greater sciatic notch of ilium; insertion, upper border of greater trochanter; action, rotates thigh laterally; nerve supply, nerve to piriformis (sciatic plexus). Synonym: musculus piriformis, musculus pyriformis, piriform muscle. (05 Mar 2000) |
| white muscle | <anatomy> A rapid or fast-twitch muscle in which pale large "white" fibres predominate; mitochondria and myoglobin are relatively sparse compared with red muscle; involved in phasic contraction. (05 Mar 2000) |
| white muscle disease | A myodegeneration most frequent in calves and lambs whose dams have been fed during gestation or longer on feeds, especially legumes, grown in certain areas where selenium is either deficient or unavailable in the soil. It has been recorded in many countries. It has been produced experimentally in several species of animals on low-selenium intake. A similar myopathy occurs naturally in goats, deer, foals, and dogs but proof of the aetiology is lacking. (merck veterinary manual, 5th ed) (12 Dec 1998) |
| plantar interosseous muscle | <anatomy> Three intrinsic muscles of foot; origin, the medial side of the third, fourth, and fifth metatarsal bones; insertion, corresponding side of proximal phalanx of the same toes; action, adducts three lateral toes; nerve supply, lateral plantar. Synonym: musculus interosseus plantaris. (05 Mar 2000) |
| plantar muscle | <anatomy, muscle> Origin, lateral supracondylar ridge; insertion, medial margin of tendo achillis and deep fascia of ankle; action, traditionally described as plantar flexion of foot; many investigators now believe the plantaris muscle to be primarily a proprioceptive organ; nerve supply, tibial nerve. Synonym: musculus plantaris, musculus tibialis gracilis, plantar muscle. (05 Mar 2000) |
| plantar muscle reflex | Flicking the tops of the toes from the plantar surface causes flexion of the toes; a stretch reflex of the flexors of the toes seen in lesions of the pyramidal tracts. See: Starling's reflex. Synonym: plantar muscle reflex, Rossolimo's sign. (05 Mar 2000) |
| plantar quadrate muscle | <anatomy, muscle> Origin, by two heads from the lateral and medial borders of the inferior surface of the calcaneus; insertion, tendons of flexor digitorum longus; action, assists long flexor; nerve supply, lateral plantar. Synonym: musculus flexor accessorius, musculus quadratus plantae, accessory flexor muscle of foot, caro quadrata sylvii, musculus pronator pedis, plantar quadrate muscle, quadrate muscle of sole. (05 Mar 2000) |
| plantar tendon sheath of peroneus longus muscle | <anatomy> The synovial sheath surrounding the tendon of the peroneus longus in its course across the sole of the foot. Synonym: vagina tendinis musculi peronei longi plantaris. (05 Mar 2000) |
| Wilson's muscle | Origin, ramus of pubis; insertion, with fellow in median raphe behind and in front of urethra; action, constricts membranous urethra; nerve supply, pudendal. Synonym: musculus sphincter urethrae, external urethral sphincter, Guthrie's muscle, musculus compressor urethrae, musculus constrictor urethrae, musculus sphincter urethrae membranaceae, sphincter muscle of urethra, Wilson's muscle. (05 Mar 2000) |