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Epicanthic fold

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572: 1159:"Dr. Frank Poirier, a physical anthropologist at Ohio State University, says the classical explanation of epicanthic fold depicts it as an adaptation to the tropical and arctic regions where many Asians live. The fold is described as a sun visor protecting the eyes from overexposure to ultraviolet radiation or as a blanket insulating them from the cold. According to Poirier, the problem with this theory is that a substantial portion of the Asian population evolved in areas outside of the tropical and arctic regions. In addition, he says epicanthic fold is not limited to Asians. 959: 507: 269: 42: 1368: 536:. Though its appearance in peoples of Southeast Asia can be linked to possible descent from cold-adapted ancestors, its occurrence in various African peoples is not open to this explanation. The epicanthic fold found in many African people has been tentatively linked to protection for the eye from the high levels of 554:
Dr. Frank Poirier, a physical anthropologist at Ohio State University, said that the epicanthic fold among Asian people is often explained as part of an adaptation to severe cold or tropical environments, however he suggests that neither of these explanations are sufficient to explain its presence in
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The degree of development of the fold between individuals varies greatly, and attribution of its presence or absence is often subjective, being to a degree relative to the occurrence of the trait within the community of the specific observer. Also, its frequency varies but can be found in peoples all
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The epicanthic fold is often associated with greater levels of fat deposition around the eyeball. The adipose tissue is thought to provide greater insulation for the eye and sinuses from the effects of cold, especially from freezing winds, and to represent an adaptation to cold climates. It has also
234:. However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature. Various factors influence whether epicanthic folds form, including ancestry, age, and certain medical conditions. 592:
lose their epicanthic folds after three to six months of gestation. Epicanthic folds may be visible in the development stages of young children of any ethnicity, especially before the nose bridge fully develops.
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The fold is also found among infants worldwide. Poirier attributes the fold to pleiotropic genes--single genes that control more than one characteristic or function--but he has no explanation for its origin."
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In some of these populations, the trait is almost universal. This is especially true in East Asians and Southeast Asians, where a majority, up to 90% in some estimations, of adults have this feature.
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The exact evolutionary function and origin of epicanthic folds remains unknown. Scientific explanations include either random variation and selection (presumably
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genes that control for more than one characteristic or function. He also did not offer an explanation for the origin of epicanthic folds.
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originates at the upper eyelid crease and merges into the skin near the medial canthus. This is the type most often found in East Asians.
547:), or possible adaption to desert environment and/or high levels of ultraviolet light found in high-altitude environments, such as the 1400: 1294: 1039: 782: 1242:
Kalyanasundaram, S.; et al. (2010). "Peroxisomal Disorder-Unusual Presentation as Failure to Thrive in Early Infancy".
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in Afghanistan and Pakistan commonly have this trait. Some people in Eastern/Northern Pakistan have this trait.
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The highest frequency of occurrence of epicanthic folds is found in specific populations or ethnicities:
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Pham, V. (2010). COMMON OTOLARYNGOLOGICAL CONGENITAL ABNORMALITIES. UTMB, Dept. of Otolaryngology.
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Epicanthic fold prevalence can sometimes be found as a sign of congenital abnormality, such as in
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John F. Kennedy had a variance of the fold and it is found among Europeans, especially the Irish,
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Ocular Hypotelorism, Submucosal Cleft Palate, and Hypospadias: A New Autosomal Dominant Syndrome
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Hammer, Gary, D.; McPhee, Stephen J. (2010). "Pathophysiology of Selected Genetic Diseases".
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Epicanthic folds also occur, at a considerably lower frequency, in other populations:
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Variation in the shape of the epicanthic fold has led to four types being recognised:
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runs from the lower eyelid skin over the medial canthus and extends to the upper lid.
885:, Semin Plast Surg. 2009 Aug; 23(3), pp. 185–197 doi: 10.1055/s-0029-1224798, p. 189 1631: 1626: 1531: 1271: 1251: 1190: 1097: 1068: 939: 904: 544: 491: 483: 336: 298: 78: 1343: 1224: 1073: 1056: 1551: 1546: 1410: 1330: 912: 716: 646: 629: 625: 606: 384: 368: 360: 506: 1681: 1599: 1433: 533: 435: 340: 50:
girl with the skin fold of the upper eyelid covering the inner angle of the eye
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This image highlights the epicanthic folds in a person of East Asian descent.
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been postulated that the fold itself may provide a level of protection from
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Assessment and management of developmental changes and problems in children
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and some other African groups have a high frequency of the epicanthic fold.
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East and Southeast Asia, and notes that the fold can also be observed in
1669: 1348: 641: 537: 455: 404: 400: 348: 332: 199: 1686: 1378: 520: 443: 396: 1414: 1241: 613:(also known as trisomy 21) have prominent epicanthic folds. In 1862, 548: 467: 427: 231: 219: 65: 479: 459: 447: 1088:
Hassan, M. M. (September 1962). "Mongolism in Sudanese children".
249:', with epi-canthus being the Latinized form of the Ancient Greek 41: 1662: 1657: 1566: 1556: 1438: 576: 495: 487: 412: 408: 392: 376: 364: 246: 227: 47: 1287:
Pathophysiology of Disease: An Introduction to Clinical Medicine
1151:"ORIGIN OF SHAPE OF ASIAN EYES IS STILL A MYSTERY TO SCIENTISTS" 1518: 1367: 380: 223: 799:"Epicanthus | definition of epicanthus by Medical dictionary" 589: 471: 463: 145: 673:"AllRefer Health – Epicanthal Folds (Plica Palpebronasalis)" 105: 475: 122: 84: 486:, among other groups in eastern and southern South Asia), 559:
and African people. He attributes the epicanthic fold to
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marker to define biological populations is debatable.
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with Finno-Ugric and/or Turco-Tatar ancestry (e.g.,
128: 125: 87: 1034:(2nd ed.). Granby, Mass: Bergin & Garvey. 899: 897: 895: 893: 891: 116: 285:runs from the brow, curving downwards towards the 1342:Kaneshiro, Neil K.; Zieve, David; Ogilvie, Isla. 1341: 526: 1709: 1179:"Modified Z-Epicanthoplasty in the Asian Eyelid" 926:Lee, Yoonho; Lee, Euitae; Park, Won Jin (2000). 888: 743:"Palpebronasal Fold - Medical Dictionary Search" 375:, they occur at very high frequencies among the 649:, the surgical modification of epicanthic folds 321: 881:Nguyen, M.Q., Hsu, P.W. and Dinh, T.A. (2009) 710: 708: 421: 1394: 1289:(6 ed.). New York: McGraw-Hill Medical. 617:classified what is now called Down syndrome. 540:light found in desert and semi-desert areas. 501: 326: 1309:: CS1 maint: multiple names: authors list ( 1284: 1129:. Rowman & Littlefield. pp. 10–11. 850: 848: 705: 1401: 1387: 925: 514:with an epicanthic fold over his left eye. 40: 1278: 1072: 519:over the world. Its use, therefore, as a 1408: 903: 861:. Rowman & Littlefield. p. 10. 845: 570: 505: 301:and extends to the inferior orbital rim. 267: 1176: 1029: 838:U. Schilbach, U. and Rott, H-D. (1988) 64:Epicanthal fold, epicanthus, eye fold, 14: 1710: 1126:Race and Racism in Theory and Practice 1087: 858:Race and Racism in Theory and Practice 1382: 1102:10.1093/oxfordjournals.tropej.a057626 1054: 769: 596: 226:that covers the inner corner (medial 1122: 854: 1527:Levator palpebrae superioris muscle 1231:. U.S National Library of Medicine. 718:Sterling Dictionary of Anthropology 714: 24: 1183:Archives of Facial Plastic Surgery 932:Plastic and Reconstructive Surgery 357:Indigenous peoples of the Americas 25: 1744: 1360: 777:(3rd ed.). Pearson Longman. 263: 1366: 957: 944:10.1097/00006534-200004050-00040 915:. Cape – via Google Books. 775:Longman Pronunciation Dictionary 566: 77: 1335: 1317: 1235: 1217: 1170: 1143: 1116: 1081: 1048: 1023: 998: 965: 938:(5): 1866–70, discussion 1871. 919: 875: 403:. It is also commonly found in 1692:Suspensory ligament of eyeball 1090:Journal of Tropical Pediatrics 832: 812: 791: 763: 735: 691: 675:. AllRefer.com. Archived from 665: 527:Possible evolutionary function 13: 1: 1074:10.1525/aa.1963.65.3.02a00260 822:, Mosby, Incorporated, p. 38 658: 27:Skin fold of the upper eyelid 1502:Trochlea of superior oblique 1244:Indian Journal of Pediatrics 748:Stedman's Medical Dictionary 322:Ethnogeographic distribution 237: 7: 1055:Angel, J. Lawrence (1963). 1006:"epicanthic fold (anatomy)" 635: 422:Lower-frequency populations 10: 1749: 1177:Park JI (1 January 2000). 502:Perception and attribution 327:High-frequency populations 255: 250: 1650: 1605:Accessory lacrimal glands 1580: 1537:Medial palpebral ligament 1517: 1467: 1421: 1256:10.1007/s12098-010-0199-6 1165:It`s just less prevalent. 1123:Lang, Berel, ed. (2000). 913:"The Living Races of Man" 855:Lang, Berel, ed. (2000). 715:Das, Ram Narayan (1997). 653:Human physical appearance 192: 180: 168: 156: 144: 139: 72: 60: 55: 39: 34: 282:Epicanthus supraciliaris 68:fold, palpebronasal fold 1509:Inferior oblique muscle 1497:Superior oblique muscle 1195:10.1001/archfaci.2.1.43 1061:American Anthropologist 1010:Encyclopædia Britannica 297:begins above the upper 260:: 'corner of the eye'. 1482:Inferior rectus muscle 1477:Superior rectus muscle 1329:6 October 2011 at the 905:Coon, Carleton Stevens 622:fetal alcohol syndrome 583: 580: 515: 294:Epicanthus palpebralis 273: 194:Anatomical terminology 1487:Lateral rectus muscle 818:Powell, M. L. (1981) 574: 509: 271: 151:plica palpebronasalis 1492:Medial rectus muscle 1375:at Wikimedia Commons 1030:Montagu, A. (1989). 883:Asian Blepharoplasty 1590:Lacrimal canaliculi 620:Other examples are 314:Epicanthus inversus 306:Epicanthus tarsalis 1582:Lacrimal apparatus 1344:"Epicanthal folds" 1225:"Epicanthal folds" 979:. 8 October 1985. 977:The New York Times 679:on 12 January 2010 603:Zellweger syndrome 597:Medical conditions 581: 516: 510:Swedish ski racer 363:(especially among 274: 1718:Human eye anatomy 1705: 1704: 1675:Plica semilunaris 1642:Nasolacrimal duct 1595:Lacrimal caruncle 1562:Palpebral fissure 1371:Media related to 1296:978-0-07-162167-0 1250:(10): 1151–1152. 1041:978-0-89789-166-0 911:(21 April 1966). 784:978-1-4058-8118-0 615:John Langdon Down 385:Northeast Indians 245:means 'above the 208: 207: 203: 16:(Redirected from 1740: 1632:Lacrimal punctum 1627:Lacrimal papilla 1615:Ciaccio's glands 1403: 1396: 1389: 1380: 1379: 1370: 1354: 1353: 1339: 1333: 1321: 1315: 1314: 1308: 1300: 1282: 1276: 1275: 1239: 1233: 1232: 1221: 1215: 1214: 1174: 1168: 1158: 1147: 1141: 1140: 1120: 1114: 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Retrieved 1009: 1000: 988:. Retrieved 976: 967: 935: 931: 921: 882: 877: 857: 839: 834: 819: 814: 802:. Retrieved 793: 774: 765: 753:. Retrieved 746: 737: 721:. Sterling. 717: 693: 681:. Retrieved 677:the original 667: 619: 600: 587: 561:pleiotrophic 553: 542: 530: 517: 425: 417: 391:and certain 373:South Asians 353:Micronesians 345:North Asians 330: 313: 312: 305: 304: 293: 292: 281: 280: 275: 242: 241: 215: 211: 209: 163:A15.2.07.028 150: 29: 1670:Conjunctiva 1349:MedlinePlus 1229:MedlinePlus 990:12 November 771:Wells, John 642:Blepharitis 538:ultraviolet 456:Lithuanians 359:, and some 349:Polynesians 333:East Asians 140:Identifiers 1712:Categories 1687:Periorbita 699:"Eye fold" 659:References 521:phenotypic 444:Hungarians 395:tribes of 243:Epicanthus 216:epicanthus 1305:cite book 1203:1521-2491 1163:he said. 985:0362-4331 973:"Q&A" 755:1 October 683:1 October 549:Himalayas 484:Sinhalese 468:Estonians 428:Europeans 381:Bhutanese 371:). Among 238:Etymology 230:) of the 220:skin fold 66:Mongoloid 1327:Archived 1264:20872098 1211:10925423 1110:13905256 1015:25 April 952:10809118 636:See also 498:people. 492:Cushites 480:Bengalis 460:Latvians 448:Russians 61:Synonyms 1663:Unibrow 1658:Eyebrow 1567:Canthus 1557:Eyelash 1469:Muscles 1413:of the 1272:5736554 804:21 July 590:fetuses 577:Khoisan 496:Amazigh 488:Nilotes 436:English 409:Kashmir 397:Eastern 393:Adivasi 377:Nepalis 365:Khoisan 247:canthus 228:canthus 56:Details 1532:Tarsus 1519:Eyelid 1293:  1270:  1262:  1209:  1201:  1133:  1108:  1038:  983:  950:  865:  826:  781:  751:. 2006 725:  628:, and 494:, and 411:. The 299:tarsus 257:κανθός 224:eyelid 48:Korean 1651:Other 1422:Bones 1411:orbit 1268:S2CID 588:Many 557:Irish 472:Samis 464:Finns 452:Poles 440:Irish 218:is a 198:[ 187:59370 146:Latin 1409:The 1311:link 1291:ISBN 1260:PMID 1207:PMID 1199:ISSN 1131:ISBN 1106:PMID 1036:ISBN 1017:2014 992:2016 981:ISSN 948:PMID 863:ISBN 824:ISBN 806:2020 779:ISBN 757:2009 723:ISBN 685:2009 605:and 575:The 476:Jews 470:and 399:and 367:and 158:TA98 1733:Eye 1415:eye 1252:doi 1191:doi 1098:doi 1069:doi 940:doi 936:105 584:Age 474:), 252:ἐπί 232:eye 214:or 210:An 182:FMA 175:211 170:TA2 1714:: 1346:. 1307:}} 1303:{{ 1266:. 1258:. 1248:77 1246:. 1227:. 1205:. 1197:. 1185:. 1181:. 1153:. 1104:. 1092:. 1065:65 1063:. 1059:. 1008:. 975:. 946:. 934:. 930:. 907:; 890:^ 847:^ 745:. 707:^ 632:. 624:, 551:. 490:, 482:, 466:, 462:, 458:, 454:, 450:, 446:, 442:, 438:, 434:, 387:, 383:, 379:, 355:, 351:, 347:, 343:, 339:, 335:, 123:oʊ 46:A 1402:e 1395:t 1388:v 1352:. 1313:) 1299:. 1274:. 1254:: 1213:. 1193:: 1187:2 1157:. 1139:. 1112:. 1100:: 1094:8 1077:. 1071:: 1044:. 1019:. 994:. 954:. 942:: 871:. 808:. 787:. 759:. 731:. 701:. 687:. 289:. 202:] 132:/ 129:d 126:l 120:f 117:ˈ 112:k 109:ɪ 106:θ 103:n 100:æ 97:k 94:ˌ 91:ɪ 88:p 85:ɛ 82:ˌ 79:/ 20:)

Index

Epicanthal folds

Korean
Mongoloid
/ˌɛpɪˌkænθɪkˈfld/
Latin
TA98
A15.2.07.028
TA2
211
FMA
59370
Anatomical terminology
edit on Wikidata
skin fold
eyelid
canthus
eye
canthus
ἐπί
κανθός

lachrymal sac
tarsus
East Asians
Southeast Asians
Central Asians
North Asians
Polynesians
Micronesians

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