| MD | Doctor of Medicine [Lat. Medicinae Doctor]; magnesium deficiency; main duct; maintenance dose; major... |
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| MDC | major diagnostic categories; Metoprolol in Dilated Cardiomyography [trial]; minimum detectable conce... |
| MDD | major depressive disorder; mean daily dose |
| MDE | major depressive episode |
| MHA | major histocompatibility antigen; May-Hegglin anomaly; Mental Health Association; methemalbumin; mic... |
| pestis major | <microbiology> This rare bacterial infection due to Yersinia pestis. It can cause painful, enlarged lymph nodes, fever, headache and prostration 2-7 days after a flea bite. May also cause pneumonia and sepsis. Transmitted in rodents and humans via an infected flea bite. The incubation period is 2-10 days. Yersinia infection is now rare in Western countries. Third world countries (for example India) can have epidemics of Yersinia. Treatment with antibiotics is necessary or most individuals will die. Even with antibiotic treatment the death rate is 5%. (15 Nov 1997) |
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| chorea major | A spasmodic attack occurring in patients with conversion hysteria. (05 Mar 2000) |
| Phlebotomus major | A vector of kala azar in the Mediterranean region. (05 Mar 2000) |
| circulus arteriosus iridis major | An arterial circle at the ciliary border of the iris. Synonym: circulus arteriosus iridis major. (05 Mar 2000) |
| clavicular part of pectoralis major muscle | pars clavicularis musculi pectoralis majoris, clavicular head of pectoralis major |
| musculus helicis major | <anatomy> A narrow band of muscular fibres on the anterior border of the helix of the auricle arising from the spine and inserted at the point where the helix becomes transverse. Synonym: musculus helicis major, large muscle of helix. (05 Mar 2000) |
| musculus pectoralis major | <anatomy, muscle> Origin, clavicular part (pars clavicularis), medial half of clavicle; sternocostal part (pars sternocostalis), anterior surface of manubrium and body of sternum and cartilages of first to sixth ribs; abdominal part (pars abdominalis), aponeurosis of external oblique; insertion, crest of greater tubercle of humerus; action, adducts and medially rotates arm; nerve supply, anterior thoracic. Synonym: musculus pectoralis major, greater pectoral muscle. (05 Mar 2000) |
| musculus psoas major | <anatomy, muscle> Origin, bodies of vertebrae and intervertebral disks from the twelfth thoracic to the fifth lumbar, and transverse processes of the lumbar vertebrae; insertion, forms a common insertion with iliacus muscle into lesser trochanter of femur; action, flexes hip joint; nerve supply, lumbar plexus (ventral rami of first, second and usually third lumbar spinal nerves). Synonym: musculus psoas major, greater psoas muscle. (05 Mar 2000) |
| musculus rectus capitis anticus major | <anatomy, muscle> Origin, anterior tubercles of transverse processes of third to sixth cervical vertebrae; insertion, basilar process of occipital bone; action, twists or flexes neck anteriorly; nerve supply, cervical plexus. Synonym: musculus longus capitis, long muscle of head, musculus rectus capitis anticus major. (05 Mar 2000) |
| musculus rectus capitis posterior major | <anatomy, muscle> Origin, spinous process of axis; insertion, middle of inferior nuchal line of occipital bone; action, rotates and draws head backward; nerve supply, dorsal branch of first cervical (suboccipital). See: suboccipital muscles. Synonym: musculus rectus capitis posterior major, greater posterior rectus muscle of head, musculus rectus capitis posticus major. (05 Mar 2000) |
| musculus rectus capitis posticus major | <anatomy, muscle> Origin, spinous process of axis; insertion, middle of inferior nuchal line of occipital bone; action, rotates and draws head backward; nerve supply, dorsal branch of first cervical (suboccipital). See: suboccipital muscles. Synonym: musculus rectus capitis posterior major, greater posterior rectus muscle of head, musculus rectus capitis posticus major. (05 Mar 2000) |
| musculus rhomboideus major | <anatomy, muscle> Origin, spinous processes and corresponding supraspinous ligaments of first four thoracic vertebrae; insertion, medial border of scapula below spine; action, draws scapula toward vertebral column; nerve supply, dorsal of scapula nerve. Synonym: musculus rhomboideus major, greater rhomboid muscle. (05 Mar 2000) |
| musculus teres major | <anatomy, muscle> Origin, inferior angle and lower third of border of scapula; insertion, medial border of intertubercular groove of humerus; action, adducts and extends arm and rotates it medially; nerve supply, lower subscapular from posterior cord of brachial plexus (fifth and sixth cervical spinal nerves). Synonym: musculus teres major. (05 Mar 2000) |
| musculus zygomaticus major | <anatomy, muscle> Origin, zygomatic bone anterior to temporozygomatic suture; insertion, muscles at angle of mouth; action, draws upper lip upward and laterally; nerve supply, facial. Synonym: musculus zygomaticus major, greater zygomatic muscle, musculus zygomaticus. (05 Mar 2000) |
| portio major nervi trigemini | <anatomy, nerve> The large sensory root of the trigeminal (or fifth cranial) nerve, extending from the semilunar ganglion into the pons through the middle cerebellar peduncle or brachium pontis, immediately lateral to the small motor root. Synonym: radix sensoria nervi trigemini, portio major nervi trigemini. (05 Mar 2000) |