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slightly backward. Its anterior wall and floor and the lower part of its posterior wall are formed by the tympanic part; the roof and upper part of the posterior wall by the squama. Its inner end is closed, by the tympanic membrane which originates from the tympanic sulcus; the upper limit of its outer orifice is formed by the posterior root of the
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The bony portion of the ear canal is nearly 2 cm long and is directed inward and slightly forward: at the same time it forms a slight curve, so that the floor of the canal is convex upward. In sagittal section it presents an oval or elliptical shape with the long axis directed downward and
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is free and rough, and gives attachment to the cartilaginous part of the ear canal. Internally, the tympanic part is fused with the petrous portion, and appears in the retreating angle between it and the
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234:. Posteriorly, it blends with the squama and mastoid part, and forms the anterior boundary of the tympanomastoid fissure.
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surface is concave, and forms the anterior wall, the floor, and part of the posterior wall of the bony
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at the SUNY Downstate
Medical Center - "Osteology of the Skull: Lateral Surface of Skull"
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due to incomplete fusion of the anterior and posterior prominences during development.
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Knowledge articles incorporating text from the 20th edition of Gray's
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is quadrilateral and slightly concave; it constitutes the posterior boundary of the
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of the tympanic part is thin, as it gives rise to the bony inner two-thirds of the
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315:. In most species, it is formed by the tympanic part of the temporal bone.
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is thin and sharp; its lateral part splits to enclose the root of the
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Middle part of the sides of the skull base, surrounding the ear canal
445:"Foramen tympanicum - Radiology Reference Article - Radiopaedia.org"
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It originates as a separate bone (tympanic bone), which in some
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Evolutionarily, a portion of it is derived from the
37:. Outer surface. (Tympanic part at bottom center.)
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1152:in petrous part, but not part of temporal bone)
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503:(3rd ed.). Academic Press. p. 435.
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138:is a curved plate of bone lying below the
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472:. Laboratory for Environmental Biology,
49:Coronal section of right temporal bone.
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416:This article incorporates text in the
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241:fuses laterally with the back of the
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190:, it presents a narrow furrow, the
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22:Tympanic part of the temporal bone
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476:. 2 November 2007. Archived from
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657:Internal occipital protuberance
603:External occipital protuberance
499:Ankel-Simons, Friderun (2007).
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71:pars tympanica ossis temporalis
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260:, and is therefore named the
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1222:Posterior clinoid processes
667:Groove for transverse sinus
424:of the 20th edition of
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1618:Bones of the head and neck
343:, from all other mammals.
323:In all extant and extinct
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1348:Anterior clinoid process
1343:Superior orbital fissure
1089:Internal auditory meatus
935:Fossa for lacrimal gland
662:Internal occipital crest
613:External occipital crest
528:Anatomy photo:22:os-0402
114:Anatomical terms of bone
1325:Sulcus of auditory tube
286:temporomandibular joint
252:The medial part of the
203:antero-inferior surface
1239:Middle clinoid process
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1516:Superior nasal concha
996:Petrotympanic fissure
388:Auditory bullae on a
247:petrotympanic fissure
1511:Supreme nasal concha
1143:Petrosquamous suture
1099:Stylomastoid foramen
986:Suprameatal triangle
878:Supraorbital foramen
284:that opens onto the
1526:Middle nasal concha
1479:Perpendicular plate
1320:Infratemporal crest
861:Superciliary arches
739:Pharyngeal tubercle
243:postglenoid process
1554:ethmoidal foramina
1472:Olfactory foramina
1433:Sphenoidal conchae
1270:Sphenoidal sinuses
1262:Sphenoidal lingula
981:Articular tubercle
652:Cruciform eminence
480:on 18 October 2010
282:foramen of Huschke
142:, in front of the
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1234:Chiasmatic groove
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1094:Cochlear aqueduct
1001:Zygomatic process
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794:Parietal eminence
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704:Hypoglossal canal
510:978-0-12-372576-9
470:"Mammal Glossary"
347:Additional images
298:suprameatal spine
294:zygomatic process
196:tympanic membrane
164:of the reptilian
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991:Mandibular fossa
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851:Frontal eminence
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484:14 September
482:. Retrieved
478:the original
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1335:Small wings
1280:Great wings
329:anthropoids
60:Identifiers
1607:Categories
1121:canaliculi
883:Brow ridge
406:References
374:middle ear
1559:Posterior
1541:Labyrinth
1378:Pterygoid
1365:processes
1363:Pterygoid
770:Opisthion
635:Occipital
577:Occipital
313:inner ear
278:ear canal
268:Ear canal
182:ear canal
166:lower jaw
148:ear canal
1564:Anterior
1488:Surfaces
1383:Scaphoid
1308:Spinosum
1293:Rotundum
1288:foramina
1192:Surfaces
1184:Sphenoid
1150:ossicles
964:Temporal
900:internal
873:foramina
866:Glabella
856:external
786:Parietal
647:internal
594:external
454:16 April
422:page 145
333:tarsiers
325:primates
188:Medially
172:Surfaces
1597:Anatomy
1447:Ethmoid
1412:Hamulus
1395:Lateral
1303:Vesalii
1148:(note:
1131:Mastoid
829:Frontal
709:jugular
687:Condyle
567:of the
392:skull (
390:red fox
341:lorises
217:Borders
155:mammals
134:of the
55:Details
1583:Portal
1455:Plates
1400:Medial
1373:fossae
1249:Clivus
1104:fossae
1082:Hiatus
1053:Aditus
765:Basion
744:Clivus
640:Nuchal
630:planes
507:
430:(1918)
339:, and
337:lemurs
309:middle
228:squama
1421:Other
1315:Spine
1298:Ovale
753:Other
599:Inion
569:skull
420:from
118:[
107:52880
66:Latin
33:Left
1428:Body
505:ISBN
486:2009
474:UTEP
456:2018
311:and
303:The
272:The
237:Its
221:Its
201:Its
176:Its
130:The
78:TA98
102:FMA
95:693
90:TA2
1609::
447:.
400:).
335:,
331:,
264:.
249:.
213:.
198:.
184:.
168:.
150:.
1585::
1055:)
1051:(
1030:)
1026:(
601:/
557:e
550:t
543:v
513:.
488:.
458:.
122:]
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