Knowledge

Frontal bone

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The frontal bone is one of the principal paired mid-line bones in dinosaur skulls. This bone is part of the skull roof, which is a set of bones that cover the brain, eyes and nostrils. The frontal makes contact with several other bones in the skull. The anterior part of the bone articulates with
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The border of the squamous part is thick, strongly serrated, bevelled at the expense of the inner table above, where it rests upon the parietal bones, and at the expense of the outer table on either side, where it receives the lateral pressure of those bones; this border is continued below into a
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begins at the end of the first or beginning of the second year, but may begin at birth. The sinuses are of considerable size by the seventh or eighth year, but do not attain their full proportions until after
313:, and backwards to form the orbital plate. The spine is ossified from a pair of secondary centers, on either side of the middle line; similar centers appear in the nasal part and zygomatic processes. 386:
bone. The posterior part of the bone articulates with the postorbital bone and the parietal bone. This bone defines all of part of the upper margin of the orbit.
149: 610: 324:, except at its lower part, by the eighth year, but occasionally persists throughout life. It is generally maintained that the development of the 939: 125: 2001: 1862: 1746: 736: 1545: 1384: 237:. The orbital part is the horizontal and second biggest region of the frontal bone. It enters into the formation of the roofs of the 1465: 1447: 1394: 1278: 547: 479: 226: 190: 573: 1886: 884: 1062: 1040: 986: 1881: 1114: 901: 1663: 1509: 603: 282:. The posterior borders of the orbital plates are thin and serrated, and articulate with the small wings of the sphenoid. 144: 1718: 1305: 1271: 711: 321: 230: 194: 1942: 1686: 1605: 1050: 1966: 1947: 932: 814: 746: 469: 1731: 1726: 1521: 1472: 1436: 1318: 1045: 996: 596: 156: 108: 1778: 1708: 718: 706: 365:
it is often separated from the orbits by one or two additional bones not found in mammals. These bones, the
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in membrane from two primary centers, one for each half, which appear toward the end of the second month of
1975: 1783: 1698: 1622: 691: 686: 395: 132: 120: 1899: 1811: 1681: 1379: 925: 696: 501: 429: 345:, the frontal bone is paired, rather than presenting the single, fused structure found in humans (see 1924: 1894: 1526: 1482: 1369: 1261: 701: 233:. The squamous part marks the vertical, flat, and also the biggest part, and the main region of the 1909: 1703: 1514: 1244: 1122: 824: 799: 678: 566: 306: 373:, together form the upper margin of the eye sockets, and lie to either side of the frontal bones. 1855: 1816: 1645: 1364: 1035: 969: 791: 906: 819: 309:. From each of these centers, ossification extends upward to form the corresponding half of the 1795: 1617: 1600: 1595: 1553: 1477: 1356: 1187: 1177: 1087: 1070: 851: 804: 771: 543: 520: 475: 454: 434: 291: 40: 1845: 1691: 1676: 1653: 1632: 1627: 1492: 1422: 1374: 1333: 1234: 1221: 1127: 1102: 1006: 841: 836: 741: 510: 402: 310: 1904: 1790: 1761: 1612: 1407: 1402: 1323: 1313: 1288: 1192: 1097: 1075: 1018: 756: 751: 620: 383: 366: 325: 761: 249:, and sometimes this is included with the squamous part. The nasal part is between the 1980: 1766: 1640: 1432: 1427: 1229: 1202: 1143: 1080: 960: 891: 809: 643: 581: 346: 317: 238: 202: 84: 349:). It typically lies on the upper part of the head, between the eyes, but in many non- 28: 1990: 1932: 1914: 1590: 1585: 1567: 1497: 1455: 1417: 1411: 1347: 1328: 1293: 1197: 1182: 1169: 991: 831: 781: 668: 663: 653: 425: 279: 262: 80: 68: 60: 1997:
Knowledge articles incorporating text from the 20th edition of Gray's Anatomy (1918)
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triangular, rough surface, which articulates with the great wing of the
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which consists of two portions. These are the vertically oriented
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animals it does not form part of the orbital cavity. Instead, in
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Gray's Anatomy E-Book: The Anatomical Basis of Clinical Practice
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The frontal bone is made up of two main parts. These are the
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At birth the bone consists of two pieces, separated by the
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Position of the frontal bone (highlighted in green).
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(1990). 468:Standring, Susan (7 August 2015). 320:, which is usually obliterated by 14: 197:, making up the bony part of the 1974: 418: 193:, and the horizontally oriented 1041:Internal occipital protuberance 987:External occipital protuberance 902:Suspensory ligament of eyeball 574:"Anatomy diagram: 34256.000-1" 247:nasal part of the frontal bone 1: 45:Animation of the frontal bone 712:Trochlea of superior oblique 474:. Elsevier Health Sciences. 322:Intramembranous ossification 1606:Posterior clinoid processes 1051:Groove for transverse sinus 432:of the 20th edition of 2018: 2002:Bones of the head and neck 580:. Elsevier. Archived from 393: 257:that articulates with the 815:Accessory lacrimal glands 747:Medial palpebral ligament 261:inferiorly, and with the 253:, and ends in a serrated 155: 38: 26: 1732:Anterior clinoid process 1727:Superior orbital fissure 1473:Internal auditory meatus 1319:Fossa for lacrimal gland 1046:Internal occipital crest 997:External occipital crest 567:Anatomy photo:23:os-0101 157:Anatomical terms of bone 1709:Sulcus of auditory tube 719:Inferior oblique muscle 707:Superior oblique muscle 516:10.1161/01.CIR.82.2.332 382:the nasal bone and the 16:Bone in the human skull 1623:Middle clinoid process 692:Inferior rectus muscle 687:Superior rectus muscle 396:anatomical terminology 1900:Superior nasal concha 1380:Petrotympanic fissure 697:Lateral rectus muscle 305:life, one above each 1895:Supreme nasal concha 1527:Petrosquamous suture 1483:Stylomastoid foramen 1370:Suprameatal triangle 1262:Supraorbital foramen 702:Medial rectus muscle 297:The frontal bone is 1910:Middle nasal concha 1863:Perpendicular plate 1704:Infratemporal crest 1245:Superciliary arches 1123:Pharyngeal tubercle 800:Lacrimal canaliculi 540:The Vertebrate Body 307:supraorbital margin 201:, part of the bony 1938:ethmoidal foramina 1856:Olfactory foramina 1817:Sphenoidal conchae 1654:Sphenoidal sinuses 1646:Sphenoidal lingula 1365:Articular tubercle 1036:Cruciform eminence 792:Lacrimal apparatus 394:This article uses 292:neural crest cells 59:Twelve bones: the 1962: 1961: 1958: 1957: 1825: 1824: 1651:Anterior surface: 1618:Chiasmatic groove 1601:Hypophysial fossa 1596:Tuberculum sellae 1583:Superior surface: 1562: 1561: 1554:Suprameatal spine 1510:Inferior tympanic 1478:Cochlear aqueduct 1385:Zygomatic process 1342: 1341: 1279:Zygomatic process 1178:Parietal eminence 1164: 1163: 1088:Hypoglossal canal 915: 914: 885:Plica semilunaris 852:Nasolacrimal duct 805:Lacrimal caruncle 772:Palpebral fissure 171: 170: 166: 2009: 1979: 1978: 1970: 1887:Uncinate process 1846:Cribriform plate 1836: 1774:pterygoid plates 1638:Lateral surface: 1628:Petrosal process 1573: 1493:Subarcuate fossa 1423:Occipital groove 1375:Mandibular fossa 1353: 1334:Frontonasal duct 1235:Frontal eminence 1218: 1188:Parietal foramen 1103:Jugular tubercle 1007:Suprainiac fossa 966: 942: 935: 928: 919: 842:Lacrimal punctum 837:Lacrimal papilla 825:Ciaccio's glands 613: 606: 599: 590: 585: 554: 553: 535: 529: 528: 518: 492: 486: 485: 465: 459: 451: 422: 421: 403:Frontal eminence 163:edit on Wikidata 43: 31: 19: 2017: 2016: 2012: 2011: 2010: 2008: 2007: 2006: 1987: 1986: 1985: 1973: 1965: 1963: 1954: 1919: 1905:Superior meatus 1879:Lateral surface 1867: 1821: 1800: 1791:Pterygoid canal 1748: 1741: 1713: 1658: 1613:Ethmoidal spine 1558: 1540: 1522:Styloid process 1442: 1408:Mastoid process 1403:Mastoid foramen 1389: 1338: 1324:Trochlear fovea 1314:Ethmoidal notch 1300: 1289:Sagittal sulcus 1207: 1193:Sagittal sulcus 1160: 1132: 1109: 1098:Jugular process 1076:Condyloid fossa 1057: 955: 946: 916: 911: 907:Tenon's capsule 856: 820:Krause's glands 786: 757:Meibomian gland 752:Epicanthic fold 723: 673: 627: 617: 572: 563: 558: 557: 550: 537: 536: 532: 494: 493: 489: 482: 467: 466: 462: 452: 445: 419: 416: 399: 392: 379: 339: 326:frontal sinuses 288: 275: 223: 183:sincipital bone 167: 46: 34: 17: 12: 11: 5: 2015: 2013: 2005: 2004: 1999: 1989: 1988: 1984: 1983: 1960: 1959: 1956: 1955: 1953: 1952: 1951: 1950: 1945: 1935: 1929: 1927: 1921: 1920: 1918: 1917: 1912: 1907: 1902: 1897: 1892:Medial surface 1889: 1884: 1882:Orbital lamina 1875: 1873: 1869: 1868: 1866: 1865: 1860: 1859: 1858: 1853: 1842: 1840: 1833: 1827: 1826: 1823: 1822: 1820: 1819: 1814: 1808: 1806: 1802: 1801: 1799: 1798: 1793: 1788: 1787: 1786: 1781: 1771: 1770: 1769: 1764: 1753: 1751: 1743: 1742: 1740: 1739: 1734: 1729: 1723: 1721: 1715: 1714: 1712: 1711: 1706: 1701: 1696: 1695: 1694: 1689: 1684: 1679: 1668: 1666: 1660: 1659: 1657: 1656: 1648: 1643: 1641:Carotid groove 1635: 1630: 1625: 1620: 1615: 1610: 1609: 1608: 1603: 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123: 117: 116: 111: 105: 104: 99: 93: 92: 88: 87: 83:, and the two 57: 53: 52: 48: 47: 44: 36: 35: 32: 24: 23: 15: 13: 10: 9: 6: 4: 3: 2: 2014: 2003: 2000: 1998: 1995: 1994: 1992: 1982: 1977: 1972: 1968: 1949: 1946: 1944: 1941: 1940: 1939: 1936: 1934: 1933:Ethmoid sinus 1931: 1930: 1928: 1926: 1922: 1916: 1915:Middle meatus 1913: 1911: 1908: 1906: 1903: 1901: 1898: 1896: 1893: 1890: 1888: 1885: 1883: 1880: 1877: 1876: 1874: 1870: 1864: 1861: 1857: 1854: 1852: 1849: 1848: 1847: 1844: 1843: 1841: 1837: 1834: 1832: 1828: 1818: 1815: 1813: 1810: 1809: 1807: 1803: 1797: 1794: 1792: 1789: 1785: 1782: 1780: 1777: 1776: 1775: 1772: 1768: 1765: 1763: 1760: 1759: 1758: 1755: 1754: 1752: 1750: 1744: 1738: 1735: 1733: 1730: 1728: 1725: 1724: 1722: 1720: 1716: 1710: 1707: 1705: 1702: 1700: 1697: 1693: 1690: 1688: 1685: 1683: 1680: 1678: 1675: 1674: 1673: 1670: 1669: 1667: 1665: 1661: 1655: 1652: 1649: 1647: 1644: 1642: 1639: 1636: 1634: 1631: 1629: 1626: 1624: 1621: 1619: 1616: 1614: 1611: 1607: 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1242: 1241: 1238: 1236: 1233: 1231: 1228: 1227: 1225: 1223: 1222:Squamous part 1219: 1216: 1214: 1210: 1204: 1201: 1199: 1198:Sagittal keel 1196: 1194: 1191: 1189: 1186: 1184: 1183:Temporal line 1181: 1179: 1176: 1175: 1173: 1171: 1167: 1155: 1152: 1150: 1147: 1146: 1145: 1142: 1141: 1139: 1135: 1129: 1126: 1124: 1121: 1120: 1118: 1116: 1112: 1104: 1101: 1099: 1096: 1095: 1094: 1091: 1089: 1086: 1082: 1079: 1077: 1074: 1073: 1072: 1069: 1068: 1066: 1064: 1063:Lateral parts 1060: 1052: 1049: 1047: 1044: 1042: 1039: 1037: 1034: 1033: 1032: 1029: 1025: 1022: 1020: 1017: 1016: 1015: 1012: 1008: 1005: 1003: 1000: 998: 995: 993: 992:Occipital bun 990: 988: 984: 981: 980: 979: 976: 975: 973: 971: 970:Squamous part 967: 964: 962: 958: 954: 950: 943: 938: 936: 931: 929: 924: 923: 920: 908: 905: 903: 900: 898: 895: 893: 890: 886: 883: 882: 881: 878: 874: 871: 870: 869: 866: 865: 863: 859: 853: 850: 848: 845: 843: 840: 838: 835: 833: 832:Lacrimal lake 830: 826: 823: 821: 818: 817: 816: 813: 811: 808: 806: 803: 801: 798: 797: 795: 793: 789: 783: 782:Gland of Zeis 780: 778: 775: 773: 770: 768: 765: 763: 760: 758: 755: 753: 750: 748: 745: 743: 740: 738: 735: 734: 732: 730: 726: 720: 717: 713: 710: 709: 708: 705: 703: 700: 698: 695: 693: 690: 688: 685: 684: 682: 680: 676: 670: 669:Lacrimal bone 667: 665: 664:Palatine bone 662: 660: 657: 655: 654:Sphenoid bone 652: 650: 647: 645: 642: 640: 637: 636: 634: 630: 626: 622: 614: 609: 607: 602: 600: 595: 594: 591: 583: 579: 575: 571: 568: 565: 564: 560: 551: 549:0-03-910284-X 545: 541: 534: 531: 526: 522: 517: 512: 508: 504: 503: 498: 491: 488: 483: 481:9780702068515 477: 473: 472: 464: 461: 457: 456: 450: 448: 444: 440: 439: 436: 433: 431: 427: 426:public domain 413: 409: 406: 404: 401: 400: 397: 389: 387: 385: 376: 374: 372: 368: 364: 360: 356: 352: 348: 344: 337:Other animals 336: 334: 332: 327: 323: 319: 314: 312: 308: 304: 300: 295: 293: 285: 283: 281: 272: 270: 268: 267:maxilla bones 264: 260: 256: 252: 248: 244: 240: 236: 232: 228: 227:squamous part 220: 218: 216: 212: 208: 204: 200: 196: 192: 191:squamous part 188: 184: 180: 176: 164: 158: 154: 151: 148: 146: 142: 139: 136: 134: 130: 127: 124: 122: 118: 115: 112: 110: 106: 103: 100: 98: 94: 89: 86: 82: 78: 74: 70: 66: 62: 58: 56:Articulations 54: 49: 42: 37: 30: 25: 20: 1937: 1891: 1878: 1851:Crista galli 1773: 1756: 1671: 1650: 1637: 1582: 1531: 1504: 1487: 1461:Facial canal 1448:Petrous part 1395:Mastoid part 1306:Orbital part 1283: 1256: 1239: 1212: 1115:Basilar part 1092: 1030: 1013: 1002:Nuchal lines 977: 949:Neurocranium 847:Lacrimal sac 659:Ethmoid bone 639:Frontal bone 638: 582:the original 577: 539: 533: 506: 500: 490: 470: 463: 453: 437: 423: 417: 408:Frontal lobe 380: 371:postfrontals 340: 315: 296: 289: 276: 254: 246: 231:orbital part 224: 210: 195:orbital part 182: 179:frontal bone 178: 172: 126:A02.1.03.001 101: 22:Frontal bone 1737:Optic canal 1719:Small wings 1664:Great wings 880:Conjunctiva 502:Circulation 367:prefrontals 343:vertebrates 286:Development 269:laterally. 259:nasal bones 255:nasal notch 251:brow ridges 175:human skull 102:os frontale 91:Identifiers 1991:Categories 1505:canaliculi 1267:Brow ridge 897:Periorbita 414:References 384:prefrontal 363:amphibians 229:, and the 213:(meaning " 85:zygomatics 79:, the two 75:, the two 71:, the two 67:, the two 1943:Posterior 1925:Labyrinth 1762:Pterygoid 1749:processes 1747:Pterygoid 1154:Opisthion 1019:Occipital 961:Occipital 377:Dinosaurs 359:bony fish 351:mammalian 221:Structure 81:lacrimals 69:parietals 1948:Anterior 1872:Surfaces 1767:Scaphoid 1692:Spinosum 1677:Rotundum 1672:foramina 1576:Surfaces 1568:Sphenoid 1534:ossicles 1348:Temporal 1284:internal 1257:foramina 1250:Glabella 1240:external 1170:Parietal 1031:internal 978:external 430:page 135 390:See also 355:reptiles 341:In most 299:ossified 280:sphenoid 263:lacrimal 235:forehead 215:forehead 199:forehead 77:maxillae 61:sphenoid 1981:Anatomy 1831:Ethmoid 1796:Hamulus 1779:Lateral 1687:Vesalii 1532:(note: 1515:Mastoid 1213:Frontal 1093:jugular 1071:Condyle 951:of the 873:Unibrow 868:Eyebrow 777:Canthus 767:Eyelash 679:Muscles 623:of the 525:2197017 331:puberty 273:Borders 239:orbital 173:In the 114:D005624 65:ethmoid 51:Details 1967:Portal 1839:Plates 1784:Medial 1757:fossae 1633:Clivus 1488:fossae 1466:Hiatus 1437:Aditus 1149:Basion 1128:Clivus 1024:Nuchal 1014:planes 742:Tarsus 729:Eyelid 546:  523:  478:  458:(1918) 438:(1918) 311:squama 177:, the 73:nasals 63:, the 1805:Other 1699:Spine 1682:Ovale 1137:Other 983:Inion 953:skull 861:Other 632:Bones 621:orbit 428:from 303:fetal 211:frons 161:[ 150:52734 97:Latin 1812:Body 619:The 544:ISBN 521:PMID 476:ISBN 369:and 361:and 265:and 241:and 217:"). 207:nose 187:bone 121:TA98 109:MeSH 625:eye 511:doi 181:or 145:FMA 138:520 133:TA2 1993:: 576:. 519:. 507:82 505:. 499:. 446:^ 357:, 333:. 294:. 1969:: 1439:) 1435:( 1414:) 1410:( 985:/ 941:e 934:t 927:v 612:e 605:t 598:v 552:. 527:. 513:: 484:. 398:. 165:]

Index



sphenoid
ethmoid
parietals
nasals
maxillae
lacrimals
zygomatics
Latin
MeSH
D005624
TA98
A02.1.03.001
TA2
520
FMA
52734
Anatomical terms of bone
edit on Wikidata
human skull
bone
squamous part
orbital part
forehead
orbital cavity
nose
forehead
squamous part
orbital part

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