| OCA | oculocutaneous albinism; olivopontocerebellar atrophy; oral contraceptive agent |
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| OPCA | olivopontocerebellar atrophy |
| POA | pancreatic oncofetal antigen; phalangeal osteoarthritis; preoptic area; primary optic atrophy |
| PPCRA | pigmented paravenous chorioretinal atrophy |
| STVA | subtotal villose atrophy |
| muscular dystrophy | A group of diseases characterised by progressive degeneration and/or loss of muscle fibres without nervous system involvement. All or nearly all of them have a hereditary origin but details of the type of genetic defect and of the prognosis for the disease vary from type to type. Duchenne muscular dystrophy (pseudohypertrophic muscular dystrophy) is the most common form. It is due to a sex-linked recessive allele and this is expressed as an absence of the protein dystrophin, the disease in boys shows extensive but insufficient muscle fibre reformation from satellite cells. (18 Nov 1997) |
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| muscular fascia of extraocular muscle | Muscular fascia; the part of the orbital fascia that envelops the extraocular muscles; it is thin posteriorly but becomes thicker where it is continuous with the bulbar sheath; the fascial sheaths of the four rectus muscles are connected by an intermuscular membrane. Synonym: fascia muscularis musculorum bulbi, fascia of extraocular muscles, muscular fascia of extraocular muscle. (05 Mar 2000) |
| muscular fibril | <cell biology> Long cylindrical organelle of striated muscle, composed of regular arrays of thick and thin filaments and constituting the contractile apparatus. (18 Nov 1997) |
| muscular hyperesthesia | Sensitiveness of the muscles to pressure. (05 Mar 2000) |
| muscular incompetence | Imperfect closure of an anatomically normal cardiac valve, in consequence of defective action of its papillary muscles. (05 Mar 2000) |
| muscular insufficiency | Failure of any muscle to contract with its normal force, especially such failure of any of the eye muscles. (05 Mar 2000) |
| muscular lacuna | The lateral compartment beneath the inguinal (Poupart's) ligament, for the passage of the iliopsoas muscle and femoral nerve; it is separated by the iliopectineal arch from the vascular lacuna. Synonym: lacuna musculorum. (05 Mar 2000) |
| muscular layer of mucosa | The thin layer of smooth muscle found in most parts of the digestive tube located outside the lamina propria mucosae and adjacent to the tela submucosa. Synonym: lamina muscularis mucosae, muscular layer of mucosa. (05 Mar 2000) |
| muscular movement | Movement caused by the contraction of the myofibrils of the muscle cells. (05 Mar 2000) |
| muscular part of interventricular septum of heart | The thick muscular portion which comprises most of the interventricular septum of the heart. Synonym: pars muscularis septi interventricularis cordis, septum musculare ventriculorum. (05 Mar 2000) |
| muscular process of arytenoid cartilage | The blunt lateral projection of the arytenoid cartilage giving attachment to the lateral and posterior cricoarytenoid muscles of the larynx. Synonym: processus muscularis cartilaginis arytenoidei. (05 Mar 2000) |
| muscular pulley | A fibrous loop through which the tendon of a muscle passes; the intermediate tendon of the digastric and omohyoid muscles pass through such a trochlea. Synonym: trochlea muscularis. (05 Mar 2000) |
| muscular reflex | Tonic contraction of the muscles in response to a stretching force, due to stimulation of muscle proprioceptors. Synonym: Liddell-Sherrington reflex, muscular reflex, stretch reflex. (05 Mar 2000) |
| muscular rheumatism | <pathology> A disorder characterised by muscle pain, stiffness and easy fatigability. The cause is unknown and an estimated 3 million Americans are affected. (27 Sep 1997) |
| muscular sense | The sensation felt in muscle when it is contracting; awareness of movement or activity in muscles or joints; sense of position or movement mediated in large part by the posterior columns and medial lemniscus. See: bathyesthesia. Synonym: deep sensibility, kinesthetic sense, mesoblastic sensibility, muscular sense, myoesthesis, myoesthesia. Origin: G. Mys, muscle, + aisthesis, sensation (05 Mar 2000) |