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Optic chiasm

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754: 742: 790: 766: 330: 714: 730: 778: 49: 29: 385:(which correspond to the lateral side of each visual hemifield, because the image is inverted) cross over to the opposite side of the body midline. The inferonasal retina are related to the anterior portion of the optic chiasm whereas superonasal retinal fibers are related to the posterior portion of the optic chiasm. 621:
Since all vertebrates, even the earliest fossils and modern jawless ones, possess an optic chiasm, it is not known how it evolved. A number of theories have been proposed for the function of the optic chiasm in vertebrates (see
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In all vertebrates, the optic nerves of the left and the right eye meet in the body midline, ventral to the brain. In many vertebrates the left optic nerve crosses over the right one without fusing with it.
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Davis, Matthew C.; Griessenauer, Christoph J.; Bosmia, Anand N.; Tubbs, R. Shane; Shoja, Mohammadali M. (2014-01-01). "The naming of the cranial nerves: A historical review".
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This article is about the optic chiasm of vertebrates, which is the best known nerve chiasm, but not every chiasm denotes a crossing of the body midline (e.g., in some
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vision. The net result is that the right cerebral hemisphere processes left visual hemifield, and the left cerebral hemisphere processes the right visual hemifield.
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The crossing of nerve fibres, and the impact on vision that this had, was probably first identified by Persian physician "Esmail Jorjani", who appears to be
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de Lussanet, Marc H.E.; Osse, Jan W.M. (2012). "An ancestral axial twist explains the contralateral forebrain and the optic chiasm in vertebrates".
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de Lussanet, M.H.E.; Osse, J.W.M. (2012). "An ancestral axial twist explains the contralateral forebain and the optic chiasm in vertebrates".
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Transformations of the visual field toward the visual map on the primary visual cortex in vertebrates. U=up; D=down; L=left; R=right; F=fovea
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Brain viewed from below; the front of the brain is above. Visual pathway with optic chiasm (X shape) is shown in red (image from
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The partial crossing over of optic nerve fibres at the optic chiasm allows the visual cortex to receive the same hemispheric
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midline inhibits crossing prior to the chiasm, where it is downregulated. The organization of RGC axons changes from
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In vertebrates with a large overlap of the visual fields of the two eyes, i.e., most mammals and birds, but also
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from both eyes. Superimposing and processing these monocular visual signals allow the visual cortex to generate
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Jeffery G (October 2001). "Architecture of the optic chiasm and the mechanisms that sculpt its development".
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Left hemisphere of the brain seen in a cadaveric specimen from the side, with the optic chiasm labelled.
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Guillery, RW; Kaas, JH (June 1973). "Genetic abnormality of the visual pathways in a "white" tiger".
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gene, the wiring is disrupted, with more of the nerve-crossing than normal. Since siamese cats, like
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depends on the degree of binocular vision of the animal (3% in mice and 45% in humans do not cross).
122: 2666: 2521: 2516: 2511: 2106: 1989: 444: 105: 623: 2240: 1736: 504: 448: 424: 2733: 2298: 2128: 2113: 2101: 1042:"The retinal ganglion cell axon's journey: Insights into molecular mechanisms of axon guidance" 585: 524: 259: 154: 142: 870: 2569: 2356: 512: 492: 341: 381:
In the case of such partial decussation, the optic nerve fibres on the medial sides of each
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Herrera, E; Erskine, L; Morenilla-Palao, C (2019). "Guidance of retinal axons in mammals".
1256:"VEGF signaling through neuropilin 1 guides commissural axon crossing at the optic chiasm" 8: 2697: 2081: 1999: 821: 699: 610: 549: 416: 1589: 1535: 686:
the optic tracts do not cross the body midline, so each side of the brain processes the
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Beyond the optic chiasm, with crossed and uncrossed fibers, the optic nerves are called
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Transformations of the visual field toward the visual map on the primary visual cortex.
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Nieuwenhuys, R.; Donkelaar, H.J.; Nicholson, C.; Smeets, W.J.A.J.; Wicht, H. (1998).
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6D (Sema6D) expressed at the midline, which form a complex that signals to Nr-CAM/
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inhibition, expressed bordering the optic nerve pathway. Ssh expressed at the
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signalling systems that activate downstream pathways inducing changes in the
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Brain seen from below, with the optic chiasm seen in yellow in the centre.
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that is covered by both eyes is fused so that the processing of binocular
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of the ipsilateral side. By this partial decussation, the part of the
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10.1002/1096-9861(20001113)427:2<209::aid-cne4>3.0.co;2-3
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the optic chiasm develops as a consequence of a twist in the early
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to a flat sheet-like orientation as they approach the chiasm site.
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Beyond the Zonules of Zinn: A Fantastic Journey Through Your Brain
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Guidance of axon crossing and non-crossing during development.
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and acts as a repulsive signal to axons originating from the
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cross. It is located at the bottom of the brain immediately
2491: 535: 455:(the latter supplying the midline portion of the chiasma). 233: 1207:"Developmental determinants at the mammalian optic chiasm" 213: 48: 1164:
Rasband, Kendall; Hardy, Melissa; Chien, Chi-Bin (2003).
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Gray's Anatomy: The Anatomical Basis of Clinical Practice
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The optic chiasma receives its arterial supply from the
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Schmolesky MT, Wang Y, Creel DJ, Leventhal AG (2000).
1356:. New York: Clarendon Press, Oxford University Press. 845:(2nd ed.). Oxford University Press. p. 530. 1253: 431:, in turn giving them to the occipital cortex of the 239: 230: 225: 1302: 219: 216: 1204: 896: 1163: 969: 967: 2720: 1376: 902: 1039: 964: 495:. This navigation is mediated by the neuronal 16:Part of the brain where the optic nerves cross 1744: 1166:"Generating X, Formation of the Optic Chiasm" 859: 1521: 1415: 1370: 1205:Guillery, RW; Mason, CA; Taylor, JS (1995). 1123:Seminars in Cell & Developmental Biology 1090: 1572: 1421: 1345: 1254:Erskine, L; Reijntjes, S; Pratt, T (2011). 499:, a structure that responds to the cues by 1751: 1737: 1576:(May 1974). "Visual pathways in albinos". 1303:Kuwajima, T; Yoshida, Y; Pratt, T (2012). 865: 719:Scheme showing central connections of the 667: 47: 27: 1668: 1490: 1449: 1439: 1390: 1328: 1279: 1230: 1181: 1116: 1114: 1112: 1067: 1057: 1000: 977:The central nervous system of vertebrates 949: 916: 875:. Harvard University Press. p. 162. 783:Cerebrum, inferior view, deep dissection. 458: 423:. In mammals they also branch off to the 1198: 328: 1351: 955: 2721: 1758: 1109: 840: 560:is expressed at the chiasm midline by 53:Optic nerves, chiasm, and optic tracts 1732: 1718:Roche Lexicon - illustrated navigator 596:-A1 receptors on crossing RGC axons. 79:Transmit visual information from the 1157: 994: 705: 759:Brain and brainstem seen from below 302:), it is located within the brain. 286:. The optic chiasm is found in all 83:to the occipital lobes of the brain 13: 1223:10.1523/JNEUROSCI.15-07-04727.1995 438: 14: 2750: 1706: 1598:10.1038/scientificamerican0574-44 1040:Erskine, L.; Herrera, E. (2007). 656:, also tend to cross their eyes ( 574:endothelial growth factor, VEGF-A 407:. The optic tract inserts on the 342:Chiasm (anatomy) § Structure 817:Definition of types of crossings 788: 776: 764: 752: 740: 728: 712: 599: 319:Definition of types of crossings 209: 179:Anatomical terms of neuroanatomy 1612: 1566: 1515: 1466: 1296: 1247: 960:. Chicago: Chicago Univ. Press. 843:Oxford Dictionary of Psychology 1714:"Anatomy diagram: 13048.000-1" 1683:10.1152/physrev.2001.81.4.1393 1095:. Cambridge University Press. 1084: 1033: 834: 1: 2631:Dorsal nucleus of vagus nerve 1544:10.1126/science.180.4092.1287 1183:10.1016/S0896-6273(03)00563-4 827: 1422:de Lussanet, M.H.E. (2019). 1321:10.1016/j.neuron.2012.03.025 1272:10.1016/j.neuron.2011.02.052 1135:10.1016/j.semcdb.2017.11.027 958:The vertebrate visual system 324: 7: 2410:Inferior salivatory nucleus 1211:The Journal of Neuroscience 1059:10.1016/j.ydbio.2007.05.013 1007:(42th ed.). New York: 800: 447:, and from branches of the 378:is enabled (see Figure 2). 258: 'crossing', from 10: 2755: 1854:lateral geniculate nucleus 1815:anterior olfactory nucleus 1720:. Elsevier. Archived from 841:Colman, Andrew M. (2006). 693: 671: 614: 608: 604: 445:anterior cerebral arteries 339: 2687: 2648: 2618: 2580: 2542: 2534:Superior cervical cardiac 2490: 2466: 2437: 2427: 2397: 2336: 2307: 2297: 2239: 2227:Superior salivary nucleus 2209: 2139: 2090: 2069: 2059: 2030: 1980:spinal trigeminal nucleus 1961: 1932: 1879: 1840: 1801: 1767: 1091:Gordon-Weeks, PR (2005). 1001:Standring, Susan (2020). 538:cross the midline at the 177: 165: 153: 141: 128: 116: 104: 92: 87: 75: 63: 58: 46: 26: 21: 2667:spinal accessory nucleus 2107:pterygopalatine ganglion 1898:Edinger–Westphal nucleus 1401:10.1163/157075611X617102 956:Stephen, Polyak (1957). 927:10.1163/157075611X617102 2049:no significant branches 1951:no significant branches 1791:no significant branches 668:Cephalopods and insects 451:which ascend along the 449:internal carotid artery 425:lateral geniculate body 270:'), is the part of the 266: 'to mark with an 2369:Stylopharyngeal branch 2129:submandibular ganglion 2114:Nerve to the stapedius 980:. New York: Springer. 586:cell adhesion molecule 570:EphB1 receptor protein 525:central nervous system 459:Development in mammals 337: 1093:Neuronal Growth Cones 1046:Developmental Biology 513:Retinal ganglion cell 332: 2217:Facial motor nucleus 1913:parasympathetic root 1352:Janvier, P. (1996). 626:). According to the 545:and continue to the 2529:Recurrent laryngeal 2374:Pharyngeal branches 2152:Posterior auricular 2000:trigeminal ganglion 1590:1974SciAm.230e..44G 1536:1973Sci...180.1287G 822:Contralateral brain 700:Zayn al-Din Gorgani 611:Contralateral brain 550:superior colliculus 417:superior colliculus 2512:Superior laryngeal 2379:Tonsillar branches 2077:Intermediate nerve 1893:oculomotor nucleus 1441:10.7717/peerj.7096 628:Axial Twist theory 617:Axial twist theory 568:retina expressing 338: 2716: 2715: 2644: 2643: 2610:Posterior gastric 2505:pharyngeal plexus 2500:Pharyngeal branch 2423: 2422: 2287:Scarpa's ganglion 2275:lateral lemniscus 2270:striae medullares 2253:vestibular nuclei 2241:Vestibulocochlear 2235: 2234: 1354:Early vertebrates 1018:978-0-7020-7707-4 882:978-0-674-02042-9 867:Bainbridge, David 852:978-0-19-861035-9 807:Chiasmal syndrome 723:and optic tracts. 706:Additional images 193: 192: 188: 2746: 2662:nucleus ambiguus 2636:Solitary nucleus 2626:Nucleus ambiguus 2605:Anterior gastric 2552:Inferior cardiac 2482:Auricular branch 2477:Meningeal branch 2435: 2434: 2415:Solitary nucleus 2405:Nucleus ambiguus 2384:Lingual branches 2305: 2304: 2299:Glossopharyngeal 2222:Solitary nucleus 2102:Greater petrosal 2067: 2066: 1917:ciliary ganglion 1753: 1746: 1739: 1730: 1729: 1725: 1702: 1661: 1660: 1633:10.1002/ca.22345 1621:Clinical Anatomy 1616: 1610: 1609: 1570: 1564: 1563: 1530:(4092): 1287–9. 1519: 1513: 1512: 1494: 1470: 1464: 1463: 1453: 1443: 1419: 1413: 1412: 1394: 1374: 1368: 1367: 1349: 1343: 1342: 1332: 1300: 1294: 1293: 1283: 1251: 1245: 1244: 1234: 1217:(7): 4727–4737. 1202: 1196: 1195: 1185: 1161: 1155: 1154: 1118: 1107: 1106: 1088: 1082: 1081: 1071: 1061: 1037: 1031: 1030: 998: 992: 991: 971: 962: 961: 953: 947: 946: 920: 900: 894: 893: 891: 889: 869:(30 June 2009). 863: 857: 856: 838: 812:Chiasm (anatomy) 792: 780: 768: 756: 744: 732: 716: 674:chiasm (anatomy) 584:(Ng-CAM-related 372:depth perception 311:Chiasm (anatomy) 249: 248: 245: 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1762: 1754: 1749: 1747: 1742: 1740: 1735: 1734: 1731: 1723: 1719: 1715: 1711: 1710: 1700: 1696: 1692: 1688: 1684: 1680: 1676: 1672: 1667: 1666: 1658: 1654: 1650: 1646: 1642: 1638: 1634: 1630: 1626: 1622: 1615: 1607: 1603: 1599: 1595: 1591: 1587: 1583: 1579: 1575: 1569: 1561: 1557: 1553: 1549: 1545: 1541: 1537: 1533: 1529: 1525: 1518: 1510: 1506: 1502: 1498: 1493: 1488: 1485:(2): 209–19. 1484: 1480: 1479:J Comp Neurol 1476: 1469: 1461: 1457: 1452: 1447: 1442: 1437: 1433: 1429: 1425: 1418: 1410: 1406: 1402: 1398: 1393: 1388: 1384: 1380: 1373: 1365: 1359: 1355: 1348: 1340: 1336: 1331: 1326: 1322: 1318: 1314: 1310: 1306: 1299: 1291: 1287: 1282: 1277: 1273: 1269: 1265: 1261: 1257: 1250: 1242: 1238: 1233: 1228: 1224: 1220: 1216: 1212: 1208: 1201: 1193: 1189: 1184: 1179: 1175: 1171: 1167: 1160: 1152: 1148: 1144: 1140: 1136: 1132: 1128: 1124: 1117: 1115: 1113: 1104: 1102:9780511529719 1098: 1094: 1087: 1079: 1075: 1070: 1065: 1060: 1055: 1051: 1047: 1043: 1036: 1028: 1024: 1020: 1014: 1010: 1006: 1005: 997: 989: 987:9783642621277 983: 979: 978: 970: 968: 959: 952: 944: 940: 936: 932: 928: 924: 919: 914: 910: 906: 899: 884: 878: 874: 873: 868: 862: 854: 848: 844: 837: 833: 823: 820: 818: 815: 813: 810: 808: 805: 804: 791: 786: 779: 774: 767: 762: 755: 750: 743: 738: 731: 726: 722: 715: 710: 709: 703: 702:(1042–1137). 701: 691: 689: 685: 681: 675: 665: 663: 659: 655: 652: 648: 644: 641:with certain 640: 635: 633: 629: 625: 618: 612: 600:Other animals 597: 595: 591: 587: 583: 579: 575: 571: 567: 563: 559: 555: 554:ipsilaterally 551: 548: 547:contralateral 544: 541: 537: 532: 530: 526: 522: 518: 514: 510: 506: 502: 498: 494: 490: 486: 482: 478: 474: 470: 466: 456: 454: 450: 446: 436: 434: 430: 426: 422: 418: 414: 410: 406: 401: 399: 395: 391: 386: 384: 379: 377: 373: 369: 365: 361: 357: 353: 348: 343: 335: 331: 322: 320: 316: 312: 308: 307:invertebrates 303: 301: 297: 293: 289: 285: 281: 277: 273: 269: 265: 261: 260:Ancient Greek 257: 253: 247: 206: 205:optic chiasma 202: 198: 186: 180: 176: 173: 170: 168: 164: 161: 158: 156: 152: 149: 146: 144: 140: 137: 134: 131: 127: 124: 121: 119: 115: 112: 109: 107: 103: 100: 97: 95: 91: 86: 82: 78: 74: 71: 70:Visual system 68: 66: 62: 57: 50: 45: 40: 36: 30: 25: 20: 2142:stylomastoid 2094:facial canal 2048: 1950: 1864:optic chiasm 1863: 1790: 1722:the original 1717: 1674: 1671:Physiol. Rev 1670: 1627:(1): 14–19. 1624: 1620: 1614: 1584:(5): 44–54. 1581: 1577: 1568: 1527: 1523: 1517: 1482: 1478: 1468: 1431: 1427: 1417: 1382: 1378: 1372: 1353: 1347: 1312: 1308: 1298: 1263: 1259: 1249: 1214: 1210: 1200: 1173: 1169: 1159: 1126: 1122: 1092: 1086: 1069:10261/338550 1049: 1045: 1035: 1003: 996: 976: 957: 951: 908: 904: 898: 886:. Retrieved 871: 861: 842: 836: 721:optic nerves 697: 677: 639:Siamese cats 636: 620: 578:Neuropilin-1 543:diencephalon 533: 509:cytoskeleton 462: 442: 409:optic tectum 405:optic tracts 402: 398:stereoscopic 390:visual field 387: 380: 368:visual field 349: 345: 333: 304: 284:hypothalamus 276:optic nerves 263: 255: 204: 201:optic chiasm 200: 197:neuroanatomy 194: 148:A14.1.08.403 136:birnlex_1416 98: 81:optic nerves 38: 22:Optic chiasm 2739:Optic nerve 2689:Hypoglossal 2070:Near origin 1869:optic tract 1574:Guillery RW 1052:(1): 1–14. 888:22 November 688:ipsilateral 680:cephalopods 662:decussation 562:radial glia 529:retinotopic 497:growth cone 465:development 364:optic tract 315:decussation 292:cyclostomes 288:vertebrates 250:; from 88:Identifiers 2723:Categories 2282:Vestibular 2194:mandibular 2167:stylohyoid 2157:Suprahyoid 2082:Geniculate 2020:mandibular 2010:ophthalmic 1963:Trigeminal 1881:Oculomotor 1027:1201341621 828:References 658:strabismus 615:See also: 590:Semaphorin 491:(Shh) and 485:morphogens 477:semaphorin 376:stereopsis 360:chameleons 352:amphibians 274:where the 118:NeuroNames 2702:Branches 2650:Accessory 2570:posterior 2557:Pulmonary 2243:(CN VIII) 2184:zygomatic 2162:digastric 2045:Branches 2015:maxillary 2006:Branches 1947:Branches 1934:Trochlear 1904:Branches 1803:Olfactory 1641:1098-2353 1434:: e7096. 1392:1003.1872 1129:: 48–59. 935:1570-7555 918:1003.1872 643:genotypes 558:Ephrin-B2 534:Most RGC 483:; and by 419:) of the 415:known as 394:binocular 325:Structure 300:hagfishes 2729:Cerebrum 2691:(CN XII) 2565:anterior 2522:internal 2517:external 2456:inferior 2451:superior 2447:Ganglia 2347:Tympanic 2326:inferior 2321:superior 2317:Ganglia 2199:cervical 2179:temporal 2063:(CN VII) 2032:Abducens 1922:inferior 1908:superior 1883:(CN III) 1769:Terminal 1691:11581492 1657:15242391 1649:24323823 1560:28568341 1509:32536933 1501:11054689 1460:31211022 1339:22632726 1290:21658587 1192:12971890 1151:24381059 1143:29174916 1078:17560562 1009:Elsevier 801:See also 624:theories 505:receptor 487:such as 433:cerebrum 429:thalamus 421:midbrain 358:such as 356:reptiles 334:Figure 2 296:lampreys 280:inferior 130:NeuroLex 76:Function 41:, 1543). 2706:lingual 2698:Nucleus 2674:Cranial 2658:Nuclei 2652:(CN XI) 2600:Hepatic 2582:Abdomen 2438:Before 2308:Before 2301:(CN IX) 2249:Nuclei 2144:foramen 2041:Nucleus 2034:(CN VI) 1996:Course 1971:Nuclei 1943:Nucleus 1936:(CN IV) 1889:Nuclei 1860:Course 1850:Nuclei 1844:(CN II) 1821:Course 1811:Nuclei 1787:Course 1777:Nuclei 1606:4822986 1586:Bibcode 1578:Sci. Am 1552:4707916 1532:Bibcode 1524:Science 1451:6557252 1409:7399128 1330:3361695 1281:3114076 1241:7623106 1232:6577905 943:7399128 694:History 684:insects 645:of the 605:Mammals 540:ventral 463:During 427:of the 413:mammals 282:to the 111:D009897 59:Details 39:Fabrica 2679:Spinal 2619:Nuclei 2590:Celiac 2544:Thorax 2467:After 2431:(CN X) 2398:Nuclei 2337:After 2210:Nuclei 2189:buccal 2091:Inside 2061:Facial 1965:(CN V) 1805:(CN I) 1771:(CN 0) 1699:203231 1697:  1689:  1655:  1647:  1639:  1604:  1558:  1550:  1507:  1499:  1458:  1448:  1407:  1360:  1337:  1327:  1309:Neuron 1288:  1278:  1260:Neuron 1239:  1229:  1190:  1170:Neuron 1149:  1141:  1099:  1076:  1025:  1015:  984:  941:  933:  879:  849:  654:tigers 651:albino 647:albino 632:embryo 594:Plexin 588:) and 582:Nr-CAM 521:Sema5A 501:ligand 481:ephrin 469:netrin 383:retina 309:, see 256:χίασμα 199:, the 65:System 2595:Renal 2429:Vagus 1842:Optic 1695:S2CID 1653:S2CID 1556:S2CID 1505:S2CID 1428:PeerJ 1405:S2CID 1387:arXiv 1147:S2CID 939:S2CID 913:arXiv 690:eye. 536:axons 517:Slit2 317:(see 272:brain 264:χιάζω 262: 254: 252:Greek 203:, or 183:[ 172:62045 94:Latin 2492:Neck 1759:The 1687:PMID 1645:PMID 1637:ISSN 1602:PMID 1548:PMID 1497:PMID 1456:PMID 1358:ISBN 1335:PMID 1286:PMID 1237:PMID 1188:PMID 1139:PMID 1097:ISBN 1074:PMID 1023:OCLC 1013:ISBN 982:ISBN 931:ISSN 890:2015 877:ISBN 847:ISBN 682:and 519:and 479:and 473:slit 411:(in 396:and 298:and 160:5668 143:TA98 106:MeSH 2140:At 1990:TMN 1975:PSN 1915:of 1679:doi 1629:doi 1594:doi 1582:230 1540:doi 1528:180 1487:doi 1483:427 1446:PMC 1436:doi 1397:doi 1325:PMC 1317:doi 1276:PMC 1268:doi 1227:PMC 1219:doi 1178:doi 1131:doi 1064:hdl 1054:doi 1050:308 923:doi 678:In 637:In 493:Wnt 374:by 321:). 195:In 167:FMA 155:TA2 123:459 2725:: 1985:MN 1716:. 1693:. 1685:. 1675:81 1673:. 1651:. 1643:. 1635:. 1625:27 1623:. 1600:. 1592:. 1580:. 1554:. 1546:. 1538:. 1526:. 1503:. 1495:. 1481:. 1477:. 1454:. 1444:. 1430:. 1426:. 1403:. 1395:. 1383:62 1381:. 1333:. 1323:. 1313:74 1311:. 1307:. 1284:. 1274:. 1264:70 1262:. 1258:. 1235:. 1225:. 1215:15 1213:. 1209:. 1186:. 1174:39 1172:. 1168:. 1145:. 1137:. 1127:85 1125:. 1111:^ 1072:. 1062:. 1048:. 1044:. 1021:. 966:^ 937:. 929:. 921:. 909:62 907:. 664:. 634:. 511:. 475:, 471:, 435:. 354:, 243:əm 234:aɪ 132:ID 37:' 1752:e 1745:t 1738:v 1701:. 1681:: 1659:. 1631:: 1608:. 1596:: 1588:: 1562:. 1542:: 1534:: 1511:. 1489:: 1462:. 1438:: 1432:7 1411:. 1399:: 1389:: 1366:. 1341:. 1319:: 1292:. 1270:: 1243:. 1221:: 1194:. 1180:: 1153:. 1133:: 1105:. 1080:. 1066:: 1056:: 1029:. 990:. 945:. 925:: 915:: 892:. 855:. 503:- 294:( 268:X 246:/ 240:z 237:æ 231:k 226:k 223:ɪ 220:t 217:p 214:ɒ 211:/ 207:( 187:]

Index


Andreas Vesalius

System
Visual system
optic nerves
Latin
MeSH
D009897
NeuroNames
459
NeuroLex
birnlex_1416
TA98
A14.1.08.403
TA2
5668
FMA
62045
Anatomical terms of neuroanatomy
edit on Wikidata
neuroanatomy
/ɒptɪkkæzəm/
Greek
Ancient Greek
X
brain
optic nerves
inferior
hypothalamus

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