Knowledge

Radius (bone)

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The radius is named so because the radius (bone) acts like the radius (of a circle). It rotates around the ulna and the far end (where it joins to the bones of the hand), known as the styloid process of the radius, is the distance from the ulna (center of the circle) to the edge of the radius (the
2107: 1336: 1342: 1341: 1338: 1337: 1343: 1340: 668:, and its upper part is rounded and indistinct; it becomes sharp and prominent as it descends, and at its lower part divides into two ridges which are continued to the anterior and posterior margins of the 471:
These two articular surfaces are separated by a prominent ridge, to which the base of the triangular articular disk is attached; this disk separates the wrist-joint from the distal radioulnar articulation.
680:. This crest separates the volar from the dorsal surface, and gives attachment to the interosseous membrane. The connection between the two bones is actually a joint referred to as a 553:
is prolonged obliquely downward into a strong, conical projection, the styloid process, which gives attachment by its base to the tendon of the brachioradialis, and by its apex to the
1131: 708:. A prominent ridge limits the insertion of the Pronator quadratus below, and between this and the inferior border is a triangular rough surface for the attachment of the 304:'s cup-shaped articulatory notch); they are crossed by others parallel to the surface of the fovea. The arrangement at the lower end is somewhat similar. It is missing in 444:
articular surface is triangular, concave, smooth, and divided by a slight antero-posterior ridge into two parts. Of these, the lateral, triangular, articulates with the
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from the lateral surface. Its upper third is prominent, and from its oblique direction has received the name of the oblique line of the radius; it gives origin to the
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is deep but narrow, and bounded laterally by a sharply defined ridge; it is directed obliquely from above downward and lateralward, and transmits the tendon of the
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below. Its lower third is broad, convex, and covered by the tendons of the muscles which subsequently run in the grooves on the lower end of the bone.
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centers: one for the body, and one for each extremity. That for the body makes its appearance near the center of the bone, during the eighth week of
582:) is prismoid in form, narrower above than below, and slightly curved, so as to be convex lateralward. It presents three borders and three surfaces. 1299: 1287: 289:. It is thickest along the interosseous border and thinnest at the extremities, same over the cup-shaped articular surface (fovea) of the head. 806:. The deepest point in the fovea is not axi-symmetric with the long axis of the radius, creating a cam effect during pronation and supination. 1456: 862:
Ossification commences in the lower end between 9 and 26 months of age. The ossification center for the upper end appears by the fifth year.
611: 515: 511: 93: 1010: 653:; it separates the posterior from the lateral surface. is indistinct above and below, but well-marked in the middle third of the bone. 1077:
for "ray". In the context of the radius bone, a ray can be thought of rotating around an axis line extending diagonally from center of
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In four-legged animals, the radius is the main load-bearing bone of the lower forelimb. Its structure is similar in most terrestrial
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groove is broad, but shallow, and subdivided into two by a slight ridge: the lateral of these two, transmits the tendon of the
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of the spongy tissue are somewhat arched at the upper end and pass upward from the compact layer of the shaft to the
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circle). The ulna acts as the center point to the circle because when the arm is rotated the ulna does not move.
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and runs parallel to the ulna. The ulna is longer than the radius, but the radius is thicker. The radius is a
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has a cylindrical form, and on its upper surface is a shallow cup or fovea for articulation with the
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fuses with the body at the age of seventeen or eighteen years, the lower about the age of twenty.
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consists of a somewhat cylindrical head articulating with the ulna and the humerus, a neck, and a
2050: 1768: 922: 826:; its surface is divided into a posterior, rough portion, for the insertion of the tendon of the 359:
originates medially along the length of the body of the radius to attach the radius to the ulna.
649:) begins above at the back of the neck, and ends below at the posterior part of the base of the 1862: 1625: 1603: 1518: 1493: 1471: 1452: 1414: 1378: 1055: 1026: 894: 873: 822: 798:. The circumference of the head is smooth; it is broad medially where it articulates with the 665: 599: 316: 2060: 2004: 1972: 1752: 1742: 1682: 1672: 1406: 1074: 1038:– a distal fracture of the radius with dorsal (posterior) displacement of the wrist and hand 898: 897:
of the upper extremity of the bone. The upper third of the body of the bone attaches to the
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is attached, while the triangular surface between the ridges gives insertion to part of the
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is the major contributor to the elbow joint, the radius primarily contributes to the
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Knowledge articles incorporating text from the 20th edition of Gray's Anatomy (1918)
750:, curving outwards to be convex at the side. Its upper third gives insertion to the 480:
This end of the bone has three non-articular surfaces – volar, dorsal, and lateral.
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The head is supported on a round, smooth, and constricted portion called the
723:) is convex, and smooth in the upper third of its extent, and covered by the 105: 1901: 1484:
Marieb, E., R.N., Ph.D; Mallatt, J., Ph.D. & Wilhelm, P., Ph.D. (2008),
1106: 866: 224: 190: 1117:) and reduced or modified in animals with flippers or vestigial forelimbs. 813:, on the back of which is a slight ridge for the insertion of part of the 240: 1677: 1580: 1488:(5th ed.), San Francisco, CA: Pearson Benjamin Cummings, p. 188 848: 704:; it is broad and flat in its lower fourth, and affords insertion to the 332: 1840: 1710: 1613: 980: 795: 727:. Its middle third is broad, slightly concave, and gives origin to the 339:. The distal end of the radius forms two palpable points, radially the 301: 166: 45: 130: 1110: 926: 890: 835: 503:, and is marked by three grooves. Enumerated from the lateral side: 1533: 1436:(5th ed.), Philadelphia, PA: Lippincott Williams & Wilkins 327:
is roughly quadrilateral in shape, with articular surfaces for the
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It is provided with two articular surfaces – one below, for the
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Proximal radius fracture. A fracture within the capsule of the
1568: 1517:. Philadelphia, PA: Holt-Saunders International. p. 199. 758:. Its lower part is narrow, and covered by the tendons of the 754:. About its center is a rough ridge, for the insertion of the 220:. At the wrist, the radius forms a joint with the ulna bone. 944:
refers to the congenital absence or shortness of the radius.
802:, narrow in the rest of its extent, which is embraced by the 746:) is convex throughout its entire extent and is known as the 634:; it ends in a small tubercle, into which the tendon of the 622:; the surface above the line gives insertion to part of the 672:. To the posterior of the two ridges the lower part of the 820:
Beneath the neck, on the medial side, is an eminence, the
1451:. USA: Lippincott Williams & Wilkins. p. 446. 956:
A subtle radial head fracture with associated positive
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muscles. The lower quarter of the body attaches to the
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internal border; crista interossea; interosseous crest;
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muscles. The middle third of the body attaches to the
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Anterior and posterior view of radius bone - labelled.
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JAMA: The Journal of the American Medical Association
2041: 2003: 1943: 1934: 1887: 1848: 1839: 1709: 1612: 1575: 1513:Romer, Alfred Sherwood; Parsons, Thomas S. (1977). 1029:– a fracture of the radius with dislocation of the 111: 99: 87: 75: 63: 58: 53: 32: 876:, appears about the fourteenth or fifteenth year. 488:, rough and irregular, affords attachment to the 216:, and in a separate region, with the ulna at the 536:is broad, for the passage of the tendons of the 311:The radius has a body and two extremities. The 1137:Radius bone and radius of a circle comparison. 979:or "sail sign" which is a displacement of the 830:, and an anterior, smooth portion, on which a 602:above to the anterior part of the base of the 1549: 1054:of the distal radius with dislocation of the 197:-shaped and slightly curved longitudinally. 8: 1498:: CS1 maint: multiple names: authors list ( 1474:at Wheeless' Textbook of Orthopaedics online 1109:, but it may be fused with the ulna in some 872:An additional center sometimes found in the 1434:Anatomy: A Regional Atlas of the Human Body 44:The radius (shown in red) is a bone in the 1940: 1845: 1556: 1542: 1534: 991:Illustration showing radius shaft fracture 432:, and another at the medial side, for the 38: 782:) presents a head, neck, and tuberosity. 555:radial collateral ligament of wrist joint 1449:Essential Clinical Anatomy Third Edition 986: 664:) begins above, at the back part of the 27:One of the two long bones of the forearm 2082: 1386: 1257:Posterior view of right proximal radius 1161:Radius, styloid process - anterior view 1127: 1491: 1368:This article incorporates text in the 1329:Anterior view of right proximal radius 598:;) extends from the lower part of the 596:margo volaris; anterior border; palmar 448:; the medial, quadrilateral, with the 128: 29: 1269:Posterior view of right distal radius 1245:Posterior surface of radius (at left) 1233:Anterior surface of radius (at right) 612:flexor digitorum superficialis muscle 516:extensor carpi radialis brevis muscle 512:extensor carpi radialis longus muscle 499:is convex, affords attachment to the 7: 1317:Anterior view of right distal radius 1281:Medial view of right proximal radius 1185:Radius, radial head – posterior view 1173:Radius, ulnar notch - posterior view 1005:with concomitant dislocation of the 420:is large and of quadrilateral form. 1305:Lateral view of right distal radius 1197:Radius, radial head – anterior view 261:Full posterior view of right radius 150: 1293:Medial view of right distal radius 1149:Position of radius (shown in red). 915:extensor primi internodii pollicis 744:facies lateralis; external surface 721:facies dorsalis; posterior surface 347:on the ulnar side. Along with the 253:Full anterior view of right radius 212:. At the elbow, it joins with the 25: 911:extensor ossis metacarpi pollicis 277:Full lateral view of right radius 2085: 1447:Moore, Keith; Anne Agur (2007). 1411:10.1001/jama.1905.02510220061023 1362: 1334: 1322: 1310: 1298: 1286: 1274: 1262: 1250: 1238: 1226: 1214: 1202: 1190: 1178: 1166: 1154: 1142: 1130: 698:facies volaris; anterior surface 647:margo dorsalis; posterior border 514:; the medial, the tendon of the 395: 386: 375: 366: 285:is enclosed in a strong wall of 269:Full medial view of right radius 764:extensor pollicis brevis muscle 760:abductor pollicis longus muscle 733:extensor pollicis brevis muscle 527:extensor pollicis longus muscle 353:distal radioulnar articulations 903:flexor digitorum superficialis 455:The articular surface for the 223:The corresponding bone in the 1: 1432:Clemente, Carmine D. (2007), 967:types of the radius include: 776:upper extremity of the radius 702:flexor pollicis longus muscle 620:flexor pollicis longus muscle 325:lower extremity of the radius 323:is self-explanatory, and the 313:upper extremity of the radius 1376:of the 20th edition of 542:extensor digitorum communis 501:dorsal radiocarpal ligament 2139: 1221:Radius l. dx. – post. view 834:is interposed between the 710:volar radiocarpal ligament 490:volar radiocarpal ligament 200:The radius is part of two 161:) is one of the two large 1209:Radius l. dx. – ant. view 678:pronator quadratus muscle 628:pronator quadratus muscle 616:flexor digitorum sublimis 606:below, and separates the 538:extensor indicis proprius 123: 37: 18:Upper extremity of radius 1405:(22): 1675. 1905-11-25. 1081:to the center of distal 1052:intra-articular fracture 1007:distal radio-ulnar joint 800:radial notch of the ulna 729:Abductor pollicis longus 630:, and attachment to the 563:extensor pollicis brevis 559:abductor pollicis longus 418:distal end of the radius 214:capitulum of the humerus 125:Anatomical terms of bone 2123:Bones of the upper limb 1472:Essex Lopresti fracture 1031:distal radioulnar joint 1009:with disruption of the 999:Essex-Lopresti fracture 794:(or capitellum) of the 748:convexity of the radius 1022:Distal radius fracture 992: 960: 907:flexor pollicis longus 893:muscle inserts on the 636:brachioradialis muscle 632:dorsal carpal ligament 278: 270: 262: 254: 246: 173:. It extends from the 169:, the other being the 1018:Radial shaft fracture 1011:interosseous membrane 990: 975:joint results in the 955: 937:Clinical significance 828:biceps brachii muscle 756:pronator teres muscle 674:interosseous membrane 357:interosseous membrane 276: 268: 260: 252: 244: 1804:supracondylar ridges 1001:– a fracture of the 1515:The Vertebrate Body 1349:Radius bone anatomy 658:interosseous border 1769:deltoid tuberosity 993: 961: 923:pronator quadratus 885:Muscle attachments 780:proximal extremity 706:Pronator quadratus 576:body of the radius 321:body of the radius 279: 271: 263: 255: 247: 2073: 2072: 2069: 2068: 1930: 1929: 1878:Lister's tubercle 1604:subclavian groove 1599:costal tuberosity 1458:978-0-7817-6274-8 1344: 1056:radiocarpal joint 1048:Barton's fracture 1027:Galeazzi fracture 895:radial tuberosity 874:radial tuberosity 823:radial tuberosity 345:Lister's tubercle 317:radial tuberosity 139: 138: 134: 16:(Redirected from 2130: 2090: 2089: 2081: 2005:Metacarpal bones 1941: 1906:coronoid process 1846: 1753:bicipital groove 1683:coracoid process 1673:spine of scapula 1558: 1551: 1544: 1535: 1529: 1528: 1510: 1504: 1503: 1497: 1489: 1481: 1475: 1469: 1463: 1462: 1444: 1438: 1437: 1429: 1423: 1422: 1391: 1366: 1365: 1346: 1345: 1326: 1314: 1302: 1290: 1278: 1266: 1254: 1242: 1230: 1218: 1206: 1194: 1182: 1170: 1158: 1146: 1134: 1042:Smith's fracture 1036:Colles' fracture 931:supinator longus 815:supinator muscle 804:annular ligament 752:supinator muscle 624:supinator muscle 399: 390: 379: 370: 283:medullary cavity 281:The long narrow 243: 152: 131:edit on Wikidata 42: 30: 21: 2138: 2137: 2133: 2132: 2131: 2129: 2128: 2127: 2098: 2097: 2096: 2084: 2076: 2074: 2065: 2037: 1999: 1926: 1921:styloid process 1914:trochlear notch 1883: 1874:styloid process 1835: 1775:lower extremity 1720:upper extremity 1705: 1608: 1589:conoid tubercle 1577:Shoulder girdle 1571: 1562: 1532: 1525: 1512: 1511: 1507: 1490: 1483: 1482: 1478: 1470: 1466: 1459: 1446: 1445: 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radius is 844: 841: 840: 839: 818: 807: 771: 770:Near the elbow 768: 717:dorsal surface 690: 689: 588: 587: 571: 568: 567: 566: 547: 546: 545: 530: 519: 497:dorsal surface 493: 478: 477: 476:Other surfaces 469: 468: 465:sigmoid cavity 459:is called the 453: 426: 425: 424:Joint surfaces 413: 412:Near the wrist 410: 404: 403: 394: 393: 385: 384: 383: 374: 373: 365: 364: 363: 362: 361: 306:radial aplasia 298:fovea capituli 236: 233: 137: 136: 127: 121: 120: 115: 109: 108: 103: 97: 96: 91: 85: 84: 79: 73: 72: 67: 61: 60: 56: 55: 51: 50: 43: 35: 34: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2135: 2124: 2121: 2119: 2116: 2114: 2113:Radius (bone) 2111: 2109: 2106: 2105: 2103: 2093: 2088: 2083: 2079: 2062: 2059: 2057: 2054: 2052: 2049: 2048: 2046: 2044: 2040: 2034: 2031: 2029: 2026: 2024: 2021: 2019: 2016: 2014: 2011: 2010: 2008: 2006: 2002: 1994: 1991: 1990: 1989: 1986: 1984: 1981: 1979: 1976: 1974: 1971: 1969: 1966: 1964: 1961: 1959: 1956: 1954: 1951: 1950: 1948: 1946: 1942: 1939: 1937: 1933: 1922: 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652: 648: 644: 643:dorsal border 639: 638:is inserted. 637: 633: 629: 625: 621: 617: 613: 609: 605: 601: 597: 593: 585: 584: 583: 581: 577: 569: 564: 560: 556: 552: 548: 543: 539: 535: 531: 528: 524: 520: 517: 513: 509: 505: 504: 502: 498: 494: 491: 487: 486:volar surface 483: 482: 481: 475: 474: 473: 466: 462: 458: 454: 451: 447: 446:scaphoid bone 443: 439: 438: 437: 435: 431: 423: 422: 421: 419: 411: 398: 389: 378: 369: 360: 358: 354: 350: 346: 342: 338: 334: 330: 326: 322: 318: 314: 309: 307: 303: 299: 295: 290: 288: 284: 275: 267: 259: 251: 242: 234: 232: 230: 226: 221: 219: 215: 211: 207: 203: 198: 196: 192: 188: 184: 180: 176: 172: 168: 164: 160: 156: 148: 144: 132: 126: 122: 119: 116: 114: 110: 107: 104: 102: 98: 95: 92: 90: 86: 83: 80: 78: 74: 71: 68: 66: 62: 57: 52: 47: 41: 36: 31: 19: 2056:intermediate 1945:Carpal bones 1919:near wrist ( 1910:radial notch 1896:near elbow ( 1868:near wrist ( 1857:near elbow ( 1849: 1817: 1803: 1789: 1773: 1757: 1738: 1724: 1718: 1687: 1667:supraglenoid 1663:infraglenoid 1658: 1639: 1621: 1514: 1508: 1485: 1479: 1467: 1448: 1442: 1433: 1427: 1402: 1398: 1389: 1381: 1367: 1361: 1104: 1095: 1085:. While the 1070: 1068: 977:fat pad sign 962: 940: 888: 871: 864: 861: 852: 846: 821: 810: 787: 779: 775: 773: 747: 743: 739: 737: 720: 716: 714: 697: 693: 691: 661: 657: 655: 646: 642: 640: 615: 595: 592:volar border 591: 589: 579: 575: 573: 550: 533: 522: 507: 496: 485: 479: 470: 464: 456: 441: 427: 417: 415: 337:lunate bones 310: 297: 291: 287:compact bone 280: 222: 218:radial notch 199: 185:side of the 177:side of the 158: 154: 146: 142: 140: 94:A02.4.05.001 69: 1870:ulnar notch 1790:epicondyles 1626:subscapular 1003:radial head 843:Development 786:The radial 682:syndesmosis 670:ulnar notch 561:muscle and 461:ulnar notch 450:lunate bone 147:radial bone 59:Identifiers 2118:Long bones 2102:Categories 1963:triquetral 1898:tuberosity 1863:tuberosity 1729:anatomical 1358:References 917:, and the 905:, and the 865:The upper 666:tuberosity 600:tuberosity 294:trabeculae 2043:Phalanges 1978:trapezoid 1973:trapezium 1902:olecranon 1830:olecranon 1780:capitulum 1739:tubercles 1659:tubercles 1419:0098-7484 1113:(such as 1107:tetrapods 1079:capitulum 1069:The word 963:Specific 958:sail sign 899:supinator 867:epiphysis 792:capitulum 725:Supinator 245:3D model. 235:Structure 225:lower leg 191:long bone 2051:proximal 1983:capitate 1968:pisiform 1953:scaphoid 1826:coronoid 1785:trochlea 1733:surgical 1696:inferior 1692:superior 1678:acromion 1581:clavicle 1494:citation 1374:page 219 965:fracture 948:Fracture 880:Function 849:ossified 688:Surfaces 349:proximal 333:scaphoid 208:and the 159:radiuses 2092:Anatomy 1993:hamulus 1841:Forearm 1808:lateral 1794:lateral 1743:greater 1711:Humerus 1700:lateral 1640:notches 1614:Scapula 1567:of the 1121:Gallery 1111:mammals 1093:joint. 1065:History 981:fat pad 929:of the 796:humerus 684:joint. 586:Borders 565:muscle. 302:humerus 227:is the 181:to the 175:lateral 167:forearm 165:of the 82:D011884 54:Details 46:forearm 2078:Portal 2061:distal 1988:hamate 1958:lunate 1850:Radius 1822:radial 1818:fossae 1812:medial 1798:medial 1747:lesser 1688:angles 1622:fossae 1521:  1455:  1417:  1382:(1918) 1115:horses 1071:radius 927:tendon 901:, the 891:biceps 859:life. 836:tendon 618:) and 614:(also 523:second 442:carpal 430:carpus 319:. The 204:: the 202:joints 143:radius 70:radius 33:Radius 1725:necks 1565:Bones 1372:from 1091:wrist 1075:Latin 1050:– an 973:elbow 857:fetal 853:three 851:from 832:bursa 608:volar 534:third 508:first 355:, an 300:(the 229:tibia 210:wrist 206:elbow 195:prism 187:wrist 183:thumb 179:elbow 163:bones 155:radii 129:[ 118:23463 65:Latin 1936:Hand 1889:Ulna 1859:head 1759:body 1519:ISBN 1500:link 1453:ISBN 1415:ISSN 1087:ulna 1083:ulna 889:The 811:neck 788:head 778:(or 774:The 762:and 738:The 715:The 692:The 656:The 641:The 590:The 578:(or 574:The 570:Body 549:The 540:and 532:The 521:The 506:The 495:The 484:The 457:ulna 440:The 434:ulna 416:The 351:and 343:and 335:and 329:ulna 292:The 171:ulna 141:The 106:1210 89:TA98 77:MeSH 2033:5th 2028:4th 2023:3rd 2018:2nd 2013:1st 1569:arm 1407:doi 1403:XLV 1073:is 157:or 151:pl. 145:or 113:FMA 101:TA2 2104:: 1912:, 1908:, 1904:, 1900:, 1876:, 1872:, 1861:, 1828:, 1824:, 1810:, 1796:, 1745:, 1731:, 1698:, 1694:, 1665:, 1646:, 1632:, 1628:, 1579:, 1496:}} 1492:{{ 1413:. 1401:. 1397:. 933:. 913:, 766:. 436:. 331:, 308:. 231:. 193:, 153:: 2080:: 1923:) 1916:) 1880:) 1865:) 1832:) 1820:( 1814:) 1806:( 1800:) 1792:( 1777:: 1761:: 1749:) 1741:( 1735:) 1727:( 1722:: 1702:) 1690:( 1669:) 1661:( 1650:) 1642:( 1636:) 1624:( 1557:e 1550:t 1543:v 1527:. 1502:) 1461:. 1421:. 1409:: 1058:. 1013:. 817:. 742:( 719:( 696:( 660:( 645:( 594:( 544:. 529:. 518:. 492:. 463:( 452:. 149:( 133:] 48:. 20:)

Index

Upper extremity of radius

forearm
Latin
MeSH
D011884
TA98
A02.4.05.001
TA2
1210
FMA
23463
Anatomical terms of bone
edit on Wikidata
bones
forearm
ulna
lateral
elbow
thumb
wrist
long bone
prism
joints
elbow
wrist
capitulum of the humerus
radial notch
lower leg
tibia

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