| PM | Psoas major |
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| greater psoas muscle | <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) |
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| 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 psoas minor | <anatomy> An inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disk between them; insertion, iliopubic eminence via iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus. Synonym: musculus psoas minor, smaller psoas muscle. (05 Mar 2000) |
| psoas | <anatomy> An internal muscle arising from the lumbar vertebrae and inserted into the femur. In man there are usually two on each side, and the larger one, or great psoas, forms a part of the iliopsoas. Origin: Gr. A muscle of the loin: cf. F. Psoas. Source: Websters Dictionary (01 Mar 1998) |
| psoas abscess | Abscess of the psoas muscle resulting usually from disease of the lumbar vertebrae, with the pus descending into the muscle sheath. The infection is most commonly tuberculous or staphylococcal. (12 Dec 1998) |
| 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) |
| psoas margin | In abdominal radiography, the appearance of the fat stripe delineating the lateral margin of the psoas muscle shadow; shows a normal retroperitoneum when visible. (05 Mar 2000) |
| psoas minor muscle | <anatomy> An inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disk between them; insertion, iliopubic eminence via iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus. Synonym: musculus psoas minor, smaller psoas muscle. (05 Mar 2000) |
| psoas muscles | A powerful flexor of the thigh at the hip joint (psoas major) and a weak flexor of the trunk and lumbar spinal column (psoas minor). Psoas is derived from the greek "psoa", the plural meaning "muscles of the loin". It is a common site of infection manifesting as abscess (psoas abscess). The psoas muscles and their fibres are also used frequently in experiments in muscle physiology. (12 Dec 1998) |
| smaller psoas muscle | <anatomy> An inconstant muscle, absent in about 40%; origin, bodies of twelfth thoracic and first lumbar vertebrae and disk between them; insertion, iliopubic eminence via iliopectineal arch (iliac fascia); action, assists in flexion of lumbar spine; nerve supply, lumbar plexus. Synonym: musculus psoas minor, smaller psoas muscle. (05 Mar 2000) |
| acoustic shadow | Sonographic appearance of reduced echo amplitude from regions lying beyond an attenuating object. Compare: acoustic enhancement. (05 Mar 2000) |
| Ponfick's shadow | A hypochromic, crescent-shaped erythrocyte, probably resulting from artifactual rupture of a red cell with loss of haemoglobin. Synonym: achromacyte, achromatocyte, ghost corpuscle, phantom corpuscle, Ponfick's shadow, shadow corpuscle, shadow, Traube's corpuscle. Origin: G. A-priv. + chroma, colour, + kytos, hollow (cell) (05 Mar 2000) |
| scissors-shadow | A distorted image seen in mixed astigmatism by retinoscopy. (05 Mar 2000) |
| hilar shadow | Radiographic hilum of the lung; a composite radiographic shadow of the central pulmonary arteries and veins, with associated bronchial walls and lymph nodes, within the right or left lung. (05 Mar 2000) |
| shadow | 1. Shade within defined limits; obscurity or deprivation of light, apparent on a surface, and representing the form of the body which intercepts the rays of light; as, the shadow of a man, of a tree, or of a tower. See the Note under Shade. 2. Darkness; shade; obscurity. "Night's sable shadows from the ocean rise." (Denham) 3. A shaded place; shelter; protection; security. "In secret shadow from the sunny ray, On a sweet bed of lilies softly laid." (Spenser) 4. A reflected image, as in a mirror or in water. 5. That which follows or attends a person or thing like a shadow; an inseparable companion; hence, an obsequious follower. "Sin and her shadow Death." (Milton) 6. A spirit; a ghost; a shade; a phantom. "Hence, horrible shadow!" 7. An imperfect and faint representation; adumbration; indistinct image; dim bodying forth; hence, mystical reprresentation; type. "The law having a shadow of good things to come." (Heb. X. 1) "[Types] and shadows of that destined seed." (Milton) 8. A small degree; a shade. "No variableness, neither shadow of turning." 9. An uninvited guest coming with one who is invited. "I must not have my board pastered with shadows That under other men's protection break in Without invitement." (Massinger) Shadow of death, darkness or gloom like that caused by the presence or the impending of death. Origin: Originally the same word as shade. See Shade. 1. To cut off light from; to put in shade; to shade; to throw a shadow upon; to overspead with obscurity. "The warlike elf much wondered at this tree, So fair and great, that shadowed all the ground." (Spenser) 2. To conceal; to hide; to screen. "Let every soldier hew him down a bough. And bear't before him; thereby shall we shadow The numbers of our host." (Shak) 3. To protect; to shelter from danger; to shroud. "Shadoving their right under your wings of war." (Shak) 4. To mark with gradations of light or colour; to shade. 5. To represent faintly or imperfectly; to adumbrate; hence, to represent typically. "Augustus is shadowed in the person of neas." (Dryden) 6. To cloud; to darken; to cast a gloom over. "The shadowed livery of the burnished sun." (Shak) "Why sad? I must not see the face O love thus shadowed." (Beau & Fl) 7. To attend as closely as a shadow; to follow and watch closely, especially in a secret or unobserved manner; as, a detective shadows a criminal. Origin: OE. Shadowen, AS. Sceadwian. See adow. Source: Websters Dictionary (01 Mar 1998) |
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