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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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318:(pl. bullae) is a hollow bony structure on the ventral, posterior portion of the skull that encloses parts of the
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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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Knowledge (XXG) articles incorporating text from the 20th edition of Gray's
Anatomy (1918)
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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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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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326:. 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
456:"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
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48:. Outer surface. (Tympanic part at bottom center.)
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514:(3rd ed.). Academic Press. p. 435.
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483:. Laboratory for Environmental Biology,
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60:Coronal section of right temporal bone.
427:This article incorporates text in the
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252:fuses laterally with the back of the
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201:, it presents a narrow furrow, the
151:squamous part of the temporal bone
33:Tympanic part of the temporal bone
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487:. 2 November 2007. Archived from
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668:Internal occipital protuberance
614:External occipital protuberance
510:Ankel-Simons, Friderun (2007).
256:, while medially it bounds the
82:pars tympanica ossis temporalis
1:
271:, and is therefore named the
168:stays separate through life.
205:, for the attachment of the
1233:Posterior clinoid processes
678:Groove for transverse sinus
435:of the 20th edition of
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1629:Bones of the head and neck
354:, from all other mammals.
334:In all extant and extinct
371:Left infratemporal fossa.
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1359:Anterior clinoid process
1354:Superior orbital fissure
1100:Internal auditory meatus
946:Fossa for lacrimal gland
673:Internal occipital crest
624:External occipital crest
539:Anatomy photo:22:os-0402
125:Anatomical terms of bone
1336:Sulcus of auditory tube
297:temporomandibular joint
263:The medial part of the
214:antero-inferior surface
1250:Middle clinoid process
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1527:Superior nasal concha
1007:Petrotympanic fissure
399:Auditory bullae on a
258:petrotympanic fissure
1522:Supreme nasal concha
1154:Petrosquamous suture
1110:Stylomastoid foramen
997:Suprameatal triangle
889:Supraorbital foramen
295:that opens onto the
1537:Middle nasal concha
1490:Perpendicular plate
1331:Infratemporal crest
872:Superciliary arches
750:Pharyngeal tubercle
254:postglenoid process
1565:ethmoidal foramina
1483:Olfactory foramina
1444:Sphenoidal conchae
1281:Sphenoidal sinuses
1273:Sphenoidal lingula
992:Articular tubercle
663:Cruciform eminence
491:on 18 October 2010
293:foramen of Huschke
153:, in front of the
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1278:Anterior surface:
1245:Chiasmatic groove
1228:Hypophysial fossa
1223:Tuberculum sellae
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1181:Suprameatal spine
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1105:Cochlear aqueduct
1012:Zygomatic process
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906:Zygomatic process
805:Parietal eminence
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715:Hypoglossal canal
521:978-0-12-372576-9
481:"Mammal Glossary"
358:Additional images
309:suprameatal spine
305:zygomatic process
207:tympanic membrane
175:of the reptilian
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16:(Redirected from
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1473:Cribriform plate
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1265:Lateral surface:
1255:Petrosal process
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1120:Subarcuate fossa
1050:Occipital groove
1002:Mandibular fossa
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961:Frontonasal duct
862:Frontal eminence
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815:Parietal foramen
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131:edit on Wikidata
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629:Nuchal lines
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495:14 September
493:. Retrieved
489:the original
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197:
188:
186:
173:angular bone
170:
163:
142:
140:
94:A02.1.06.052
81:
1364:Optic canal
1346:Small wings
1291:Great wings
340:anthropoids
71:Identifiers
1618:Categories
1132:canaliculi
894:Brow ridge
417:References
385:middle ear
1570:Posterior
1552:Labyrinth
1389:Pterygoid
1376:processes
1374:Pterygoid
781:Opisthion
646:Occipital
588:Occipital
324:inner ear
289:ear canal
279:Ear canal
193:ear canal
177:lower jaw
159:ear canal
1575:Anterior
1499:Surfaces
1394:Scaphoid
1319:Spinosum
1304:Rotundum
1299:foramina
1203:Surfaces
1195:Sphenoid
1161:ossicles
975:Temporal
911:internal
884:foramina
877:Glabella
867:external
797:Parietal
658:internal
605:external
465:16 April
433:page 145
344:tarsiers
336:primates
199:Medially
183:Surfaces
1608:Anatomy
1458:Ethmoid
1423:Hamulus
1406:Lateral
1314:Vesalii
1159:(note:
1142:Mastoid
840:Frontal
720:jugular
698:Condyle
578:of the
403:skull (
401:red fox
352:lorises
228:Borders
166:mammals
145:of the
66:Details
1594:Portal
1466:Plates
1411:Medial
1384:fossae
1260:Clivus
1115:fossae
1093:Hiatus
1064:Aditus
776:Basion
755:Clivus
651:Nuchal
641:planes
518:
441:(1918)
350:, and
348:lemurs
320:middle
239:squama
1432:Other
1326:Spine
1309:Ovale
764:Other
610:Inion
580:skull
431:from
129:[
118:52880
77:Latin
44:Left
1439:Body
516:ISBN
497:2009
485:UTEP
467:2018
322:and
314:The
283:The
248:Its
232:Its
212:Its
187:Its
141:The
89:TA98
113:FMA
106:693
101:TA2
1620::
458:.
411:).
346:,
342:,
275:.
260:.
224:.
209:.
195:.
179:.
161:.
1596::
1066:)
1062:(
1041:)
1037:(
612:/
568:e
561:t
554:v
524:.
499:.
469:.
133:]
20:)
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