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Anatomy Atlases: Illustrated Encyclopedia of Human Anatomic Variation: Opus V: Skeletal System: TemporalBone

Illustrated Encyclopedia of Human Anatomic Variation: Opus V: Skeletal Systems: Cranium

Temporal Bone

Ronald A. Bergman, PhD
Adel K. Afifi, MD, MS
Ryosuke Miyauchi, MD

Peer Review Status: Internally Peer Reviewed


Absence of the superior part of the squama temporalis has been reported.

A frontosquamous suture frequently occurs, which is normally found in the skulls of the chimpanzee, gorilla, and gibbon.

The petrosquamous suture of the temporal bone sometimes persists. The mastoid cells vary in extent and may invade the squamous part of the bone; the air cells may not be symmetrical on the two sides.

The squama in some cases is divided into two or four parts.

A bar of bone in the dura over the trigeminal nerve has been interpreted as a vestige of the primitive cranial wall as present in reptilia.

The styloid processes vary markedly in length, and the stylohyoid ligament may calcify to make a rigid connection with the hyoid bone. A 75 mm long styloid process has been reported. The styloid process may be composed of two to five osselets, articulating by synchrondoses.

The greater horn of the hyoid may be joined to the body of the hyoid by an articulation. The zygomatic arch may be replaced by a fibrous band. In some cases, the zygomatic process of the temporal bone is absent.

The mastoid process may possess a double apex, with the medial portion divided from the lateral by a fissure. Usually, the medial lip of the groove forms a distinct ridge and provides the point of attachment of the digastric muscle; an enlarged paramastoid process may result from the development of air cells within the medial portion of the process. Air cells, usually confined to the mastoid process, may invade the horizontal or vertical part of the squama, or even the pars petrosa.

The mastoid cells vary greatly in extent and the pneumatization may be unsymmetric on the two sides.

The pars petrosa is very rarely variable. The subarcuate fossa, however, may persist, in part, as a bony canal. In cases of absence of the internal carotid artery, the carotid canal may also be absent. In two cases this was found on the left side; in a third case the side was not specified. The carotid canal may take one of several forms, including that of a sulcus. The squamous part of the temporal bone may exhibit a sizable, extra process just anterior to the external acoustic meatus, called the postglenoid process.

A canal or foramen (of Hüschke) is found in the floor of the bony part of the external auditory meatus, near the tympanic ring during the first five years of life. It may persist throughout life.

The suprameatal spine, which overlies the floor of the mastoid antrum, is absent in 20% of skulls. A bony process may project from the anterior edge of the squama that runs between the sphenoid and parietal bones to the lateral edge of the frontal bone. This process effectively intervenes between the parietal and sphenoid bones. The squama may also exhibit a foramen jugulare spurium by which intracranial venous blood may communicate with the external jugular system. The fetal suture between the squama and the mastoid process sometimes persists in the adult.

A foramen may be present in the petrobasilar fissure in front of the jugular foramen through which runs the inferior petrosal sinus. The jugular foramen, a passage between the petrous portion of the temporal bone and the jugular process of the occipital bone, may be divided into two parts by intrajugular processes.

The upper edge of the internal acoustic meatus may form a tubercle, the crista tentori, that roofs the superior petrosal sinus.

The stapedius muscle may be absent. A stapes with two (doubled) end plates has been reported. One endplate was located in the oval window (as usual), the second was in the round window (Murphy).

The mallens and incus were first described by Berengaria da Carpi in 1521. The stapes was first describe by Ingrassia in 1546.

The malleus was studied in 22 specimens:

Max. head size = 2.13 to 2.84 mm.
Min. head size= 1.67 to 2.07 mm
Length of handle = 4.33 to 5.67 mm.
Length of ossicle = 7.61 to 9.11 mm.
Width of neck = 1.30 to 2.45 mm.

The Incus was studied in 22 specimens:

Max. width of ossicle = 1.73 to 2.49 mm.
Length of body = 4.79 to 5.44 mm.
Width of short process 2.30 to 289 mm.
Length of long process 4.27 to 5.55 mm.
Max. length of body = 3.36 to 4.09 mm.

The styloid process of the temporal bone was absent in 58/150 cranial halves; hence it is undependable as a surgical marker for the stylomastoid foramen.

The length of the styloid process is variable in length. The variation in size found by Lang (1983), 0.1 - 0.9 cm. in 18 cases; 1 - 1.9 cm in 40 cases; 2.0 - 2.9 cm in 19 cm; 3.0 - 3.9 cm in 14 cases; and 4.0 - 4.2 in 1. The maximum size found in this study was a 4.2 cm styloid process. The styloid processes are typically bilaterally dissimilar in length. In 18 skulls, the process was absence unilaterally" in 20 skulls, the styloid process was absent bilaterally.

The stylomastoid foramen transmits the facial nerve, stylomastoid artery, and the auricular branch of the vagus nerve.

Styloid Process

The Hyoid Apparatus


References

Altmann, F. (1923) Zur Anatomie und formalen Genese der Atresia auris congenita. Monatsschrift f. Ohrenheilkunde 67:765-882.

Altmann, F. (1934) Über Fehlbildungen der AmboszSteigbügelverbindung und des Stapes. Monatsschrift f. Ohrenheilkunde 68:469-473.

Altmann, F. (195 1) Malformation of Eustachian tube, middle ear, and its appendages: Critical Review. Arch. Otolaryngol. 54:241-266.

Altmann, F. (1953) Malformations, anomalies and vestigal structures of the inner ear. Arch. Otolaryngol. 57:591-602.

Angel, J.L. (1948) Factors in temporomandibular joint format. Am. J. Anat. 83:223-246.

Anson, B.J., Harper, D.G. and R.L. Warpeha. (1963) Surgical anatomy of the facial canal and facial nerve. Ann. Otol. Rhinol. Laryngol. 75:713-734.

Anson, B.J., Donaldson, J.A., Warpeha, R.L. and T.R. Winch. (1965) The vestibular and cochlear aqueducts: their variational anatomy in the human ear. Laryngoscope 75:1203-1223.

Anson, B.J., Caldwell, E.W. and A.F. Reimann. (1944) The human stapes: A nonconformist among bones. Quart. Bull. Northwestern Univ. Med. School 18:33-40.

Anson, B.J., Ed. (1966) Morris' Human Anatomy, 12th ed. The Blakiston Division, McGraw-Hill Book Co., New York.

Anthony, W.P. (1957) Congenital and aquired atresia of the external canal. Arch. Otolarynigol. 65:479- 486.

Bansal, P.C. (1964) A case of abnormal os hyoid and thyroid cartilage. J. Anat. Soc. India 13:105-106.

Bast, T.H. and B.J. Anson. (1949) The Temporal Bone and the Ear. CC Thomas, Springfield, Illinois.

Beck, J. ( ) Anatomy, psychology, diagnosis and treatment of congenital malformation of absence of ear. Laryngoscope 35:813-831.

Becker, S.W. and A. Braunschwig. (1934) Sinus preauricularis (fistula preauricularis congenita). Am. J. Surg. 24:174-177.

Bernstein, L. (1966) Congenital absence of the oval window. Arch. Otolaryngol. 83:533-537.

Beutel. A. (1935) Die Verknöcherung des Ligamentum stylohyoideum. Röntgenpraxis 7:665-670.

Bovero, A. (1902) Mancaza quasi completa della squama temporalis nel cranio umano associata ad altre anomalie. Assoc. Anatomistes Comptes Rendus 4:262-271.

Brzezinski, D.K. (1963) Zur Variabilität des Canalis caroticus. Anat. Anz. 113:164-170.

Caparosa, R. and 0. Klassen. (1966) Congenital anomalies of the stapes and facial nerve. Arch. Otolaryngol. 83:420-421.

De Chazal, A. (1946) Elongated styloid process encountered during tonsillectomy. Brit. Med. J. 2:199.

Christensen, J.B., Lachman, E. and A.M. Brues. (1960) A study of the roentgen appearance of cranial vault sutures. Am. J. Roentgenol. 83:615-627.

Clarke, J.J. (1893) Some observations on the temporal bone, chiefly in childhood. J. Anat. Physiol. 27:411-414.

Claus, G. (1933) Studien über das Os temporale und seine Ungebung. Hals-, Nasen- u. Ohrenheflkunde 33:515-533.

Congdon, E.D., Rowhanavongse, S. and P. Varamisara. (1932) Human congenital auricular and juxtaauricular fossae, sinuses and scars (including the so-called aural and auricular fistulae) and the bearing of their anatomy upon the theories of their genesis. Am. J. Anat. 51:439-459.

Corsy, F. (1920) L'appareil hyoïden n'est que la persistance de l'état foetal. Soc. Biol. Comptes Rendus Hebdomadaires des Séances et Mémoires. 83:228-229.

Costello, M.J. and J.H. Shepard. (1939) Supernumerary external ears. Arch. Otolaryngeol. 29:596-698.

Corsy, F. (1931) Appareil hyoïden complet et appareil hyoïdien inverse essai d'interprétation. Assoc. Anatomistes Comptes Rendus 26:132-143.

Curtin, H.D. and M.May. (1986) Double internal auditory canal associatedwitliprogressive facial weakness. Am. J. Otol. 7:275-281.

Cutore, G. (1906) Fréquence et mode de se comporter des canaux perforants artériels dans la squama temporalis de l'homme. Arch. Ital. Biol. 45:277-278.

Dass, R., Grewal, B.S. and S.P. Thapar. (1966) Human stapes and its variations. 1. General features. J. Laryngol. Otol. 80:11-25.

Dass, R., Grewal, B.S. and S.P. Thapar. (1966) Human stapes and its variations. II. Footplate. J. Laryngol. Otol. 80:471-480.

Dass, R., Grewal, B.S. and S.P. Thapar. (1966) Human stapes and its variations. III. Influence of age and sex. J. Laryngol. Otol. 80:1023-1037.

Davis, E.D. (1912-13) Post-mortem specimen of unilateral deformity of the auricle, meatus and middle ear. Proc. Roy. Soc. Med., Otol. Sect. 6 (pt. 111):87-88.

Donaldson, J.A., Duckert, L.G., Lambert, P.M. and E.W. Rubel. (1992) Anson-Donaldson Surgical Anatomy of the Temporal Bone, 4th ed., Raven Press, New York.

Douglas, T.E., Jr. (1952) Facial pain from elongated styloid process. Arch. Otolaryngol. 56:635-638.

Druss, J.G. and B. Allen. (1940) Congenital fistula of the neck communicating with the middle ear. Arch. Otolaryngeol. 31:433-437.

Dubreuil-Chambardel, L. (1920) Sur un cas d'ossification de la chaine hyöidienne. Bull. et Mém. de la Soc. d'Anthrop. de Paris 1:79-82.

Dwight, T. (1907) Stylo-hyoid ossification. Ann. Surg. 46:721-735.

Eagle, W.W. (1948) Elongated styloid process. Further observations and a new syndrome. Arch. Otolaryngol. 47:630-640.

Eagle, W.W. (1949) Symptomatic elongated styloid process: Report of two cases of styloid process- carotid artery syndrome with operation. Arch. Otolaryngol. 49:490-503.

Eustachi, B. (1564) Opuscula Anatomica. Vincentius Luchinus excudebat, Venice.

Evans, T.H. (1956) The variability of the lateral semicircular canal. Ann. Otol., Rhinol. and Laryngol. 65:993-994.

Evans, W.A. , Jr. (1940) The epihal bone. A consideration of some small accessory bones of the neck. Am. J. Roentgenol. 44:714-715.

Everberg, G.-(1960) Investigations into unilateral total deafness and absence of vestibular function with a particular view to the x-ray appearance in the inner ear. Acta Oto-laryngol. 52:47-62.

Fischer, H. (1926) Le sinus pétro-squameux chez l'homme: un cas de communication de la jugulaire externe avec le sinus latéral. Assoc. Anatomistes Comptes Rendus 21:210-211.

Fournier, A.M. (1950) Un cas de persistance de l'appareil hyoïden. J. Radiol. Electrol. 31:513.

Fraser, J.S. and E.D.D. Davis. (1929) Mal-developments of the auricle, external acoustic meatus and middle ear. J. Laryngol. and Otol. 44:544-552.

Fraser, J.S. and E.D.D. Davis. (1929) Mal-developments of auricle, external acoustic meatus and middle ear. Proc. Roy. Soc. Med., Otol. Sect. 22:1297-1308.

Fritz, M. (1940) Elongated styloid process: A case of obscure throat symptoms. Arch. Otolaryngol. 31:911-918.

Frommer, J., Monroe, C.W. and B. Spector. (1962) Joints between segments of the human stylohyoid chain. Anat. Rec. 142:305.

Gasser, R.F. (1967) The development of the facial nerve in man. Ann. Otol. Rhinol. Laryngol. 76:37- 56.

Gelston, C.F. and E.E. Sappington. (1932) Congenital malformations of auricle associated with paralysis of facial nerve. Arch. Pediatr. 49:730-742.

Giuffrida-Ruggeri, V. (1901) Os fontanellaires et espaces suturaux dan la norma lateralis. Arch. Ital. Biol. 36:337.

Giuffrida-Ruggeri, V. (1901) Division longitudinale de l'ala magna du sphénoide. Extension de la squame du temporal en hauteur comme caractère hiérarchique, situation du squelette nasal. Arch. Ital. Biol. 36:337-338.

Greig, D.M. (1927) Congenital absence of tympanic elements of both temporal bones. J. Laryngol. and Otol. 42:309-314.

Gruber, W. (1869) Beiträge zur Anatomie des Schädelgrundes. Mémoires de L'Académie Impériale des Sciences de St. Petersbourg, VIIth Série. XIII (7):1-34.

Gruber, W. (1870) Über enorm lange Processus styloides der Schläfenbeine. Arch. Pathol. Anat. Physiol. Klin. Med. 50:232-234.

Gruber, W. (1875) Enorm weiter Canalis mastoideus. Arch. Pathol. Anat. Physiol. Klin. Med. 65:9-10.

Gruber, W. (1876) Eine Bursa mucossa capituli ossis hyoidis. Arch. Pathol. Anat. Physiol. Klin. Med. 67:359-360.

Gruber, W. (1877) Über eine anomale, congenitale, von der Spina jugularis posterior des Temporale gebilete Knochenbrücke über dem sulcus jugularis des Occipitale. Arch. Pathol. Anat. Physiol. Klin. Med. 69:283-285.

Gruber, W. (1877) Eigenthümlicher stielförmiger Fortsatz der Schläfenbeinschuppe. Arch. Pathol. Anat. Physiol. Klin. Med. 69:386-387.

Gruber, W. (1877) Processus styloides und Processus vaginalis des Felsenbeines von fast gleicher Länge. Arch. Pathol. Anat. Physiol. Klin. Med. 70:136-137.

Gruber, W. (1878) Zu den in der Sutura squamosa auftretenden Knochen. Arch. Pathol. Anat. Physiol. Klin. Med. 72:480-486.

Gruber, W. (1878) Zweigetheilte Temporalschuppe - Squama temporalis bipartita. Arch. Pathol. Anat. Physiol. Klin. Med. 72:486-488.

Gundersen, T. (1966) Congenital malformations of the stapes footplate. Arch. Otolaryngol. 85:171-176.

Hagens, E.W. (1932) Anatomy and pathology of the petrous bone: Based on a study of fifty temporal bones. Arch. Otolaryngol. 19:671-680.

Hagens, E.W. (1932) Malformations of auditory apparatus in newborn associated with ectopic thymus. Arch. Otolaryngeol. 15:671-680.

Hawley, C.W. (1922) Abnormalities of the mastoid with special reference to the facial nerve. Illinois Medical Journal 41:116.

Heiman, T.H. (1891) A case of partial development of both auditory organs. (Trans. by C.A. Wood). Arch. Otology 20:332-337.

Henner, R. Congenital middle ear malformations. Arch. Otolaryngol. 71:454-458.

Heuner, R. R. Buckingham. (1956) The recognition and surgical treatment of congenital ossicular defects. Laryngoscope 66:526-539.

Hofmann, L. (1927) Ein Fall von konenitaler Ohrmissbildung. Monattsschrift f. Ohrenheilkunde. 61:509-512.

Hofmann, L. (1930) Eine seltene Ohrmissbildung. Monatsschrift f. Ohrenheilkunde 64:1412-1424.

Hough, J.V.D. (1958) malformations and anatomical variations seen in the middle ear during the operation for mobilization of the stapes. Laryngscope 68:1337-1379.

Inumaru, H. (1925) über das Foramen mastoideum. Folia Anat. Jpn. 3:229-239.

Jelisiejew, T., Szmurlo, J. and I. Kuduk. (1968) Morphologic studies on the styloid bone in man. Folia Morphol. (Warsaw) 27:172-182.

Jensen, J. (1969) Malformations of the inner ear in deaf children. A tomographic and clinical study. Acta Radiologica, Suppl. 286, page 197.

Johnsson, L. (1971) Degenerative changes and anomalies of the vestibular system in man. Laryngoscope 81:1682-1694.

Kelemen, G. (1943) Malformation involving external, middle and internal ear, with otosclerotic focus. Arch. Otolatyngol. 37:183-198.

Khoo, F.Y. (1946) Giant jugular fossa, with brief notes on the anatomical variations of the jugular fossa. Am. J. Roentgenol. 55:333-336.

Klinefelter, E.W. (1952) The anomalous hyoid. Review of the literature and report of a case. Radiology 58:224-227.

Kraus, P. and M. Ziv. (1971) Incus fixation due to congenital anomaly of the chorda tympani. Acta Otolaryngol. 72:358-360.

Kvasnicka, I. (1958) Processus paramastoideus (P.p.) als Ursache einer schieffen Kopfhaltung. Fortschr. Roentgenstr. 88:744-746.

Lange, B. (1924-25) Ein menschlicher Schädel mit auffallendem Schläfenzwischenknochen. Anat. Anz. 59:197-199.

LeDouble, -. (1902) Sillon temporo-pariétal externe. Assoc. Anatomistes Comptes Rendus 4:205-206.

Leonard, J. and D. Alexander. (1968) Anatomic variations in the area of the oval window. Arch. Otolaryngol. 87:48-55.

Lockhart, R.D. (1929) Variations coincident with congenital absence of the zygoma (zygomatic process of the temporal bone) J. Anat. 58:223-236.

Lucien, -. (1921) A propos du processus rétromastoideus chez l'homme. Soc. Biol. Comptes Rendus Hebomadaires des Séances et Mémoires 84:803-805.

MacDonnell, R.L. (1886-87) Congenital absence of the petrous portion of the temporal bone. Canadian Med. Rec. (Montreal) 15:103.

Marriott, W. McK. and R.J. Terry. (1922) Congenital malformations of auditory organs. J. Missouri Med. Assoc. 19:196.

Marrow, G. (1907) Contribution à la casuistique et la interprétation des anomalies de l'arcade zygomatique. Arch. Ital. Biol. 47:476-477.

McClerkin, W.W. and H.F. Schuknecht. (1974) Facial nerve and stapes anomaly: A case report. Laryngoscope 84:1202-1209.

Moosl S. (1884) A peculiar malformation of the right ear with intact labyrinth (Translated by J.A. Spaulding). Arch. Otol. 13:238.

Murakami, Y. and H.F. Schuknecht. (1968) Unusual congenital anomalies in the inner ear. Arch. Otolaryngol. 87:335-349.

Murphy, K.W.R. (1971) A unique stapedial abnormality. J. Laryngol., Otol. 85:501-503

Myerson, M.C., Rubin, H. and J.G. Gilbert. (1934) Anatomic studies of the petrous portion of the temporal bone. Arch. Otolaryng. 20:195-210.

Nager, F.R. (195 1) Die labyrinthmissbildung im. Lichte der heutigen Vererbungslehre. Otorhinolarngol. 13:129-145.

Opikofer, E.K. (1946) Hals-Ohrfistel (Fistula collo-auralis congenita). Pract. Otorhinolaryngol. 8:515-530.

Polvogt, L.M. (1936) Histologic variations in the middle and inner ears of patients with normal hearing. Arch. Otolaryhgol. 23:48-56.

Polvogt, L.M. and S.J. Crowe. (1937) Anomalies of cochlea in patients with normal hearing. Ann. Otol. Rhin. & Laryngol. 46:579-591.

Pou, J.W. (1963) Congenital absence of oval window. Laryngoscope 73:384-391.

Proctor, B and G.T. Nager. (1982) The facial canal: normal anatomy, variations, and anomalies. Ann. Otol. Rhinol. Laryngol. 91 (Suppl. 97):33-61.

Puchowski, B. (1933) Un cas d'anomalie de Pappariel hyoidien. Acta Oto-Laryngeal. 18:447-448.

Rask-Andersen, H, Stahle, J. and H. Wilbrand. (1977) Human cochlear aqueduct and its accessory canals. Ann. Otol. Rhinol. Laryngol. 86:(Suppl. 42):116.

Ravelli, A. (1954) Mehrfache Processus styloidei an der Lendenwirbelsäule. Radiol. Clin. 23:57-58.

Richards, L. (1933) Congenital atresia of the external auditory meatus. Ann. Otol., Rhin. Laryngol. 42:692-711.

Rouviere, H. and E. Oliver. (1922) Faiseau maxillaire du styloglosse et signification du ligament stylo-maxillaire. Soc. Biol. Comptes Rendus Hebdomadaires des Séances et Mémoires. 87:337-339.

Russo-Frotasi, G. (1934) Rare congenital middle ear anomaly in cleidocranial dysostosis. Oto-Rhino- Laryngol., Italiano. 4:484-502.

Sando, I., Shibahara, Y., Takagi, A., Takahara, T. and N. (1988) Frequency and localization of congenital anaomalies of the middle and inner ears: a human temperal bone histolpathological study. Int. J. Pediatr. Otolaryngol. 16:1-22.

Schmidt, O.V.M. (1950) Elongated styloid process which interfered with function of a singer's voice. Operation and recovery. Arch. Otolaryngol. 54:417-421

Schulz, H.-G. (1965) Uber die Erkennbarkeit und Variabilitdt des Processus styloideus ossis temporalis. Fortschritte Röntgenstrahlen 102:185-190.

Sellers, L.M. and B.J. Anson. (1962) Anatomical observations on the round window by Antonia Scarpa. Arch. Otolaryngol. 75:2-45.

Stafne, E.C. and W.H. Hollinshead. (1962) Roentgenographic observations on the stylohyoid chain. Oral. Surg. 15:1195-1200.

Stewart, J.P. (1929) The persistence of fetal blood sinuses and their relation to the middle ear spaces. Arch. Otolaryngol. 10:266-275.

Straith, C.L. and J.R. Lewis. (1949) Associated congenital defects of ears, eyelids and malar bones. Plastic Reconstruct. Surg. 4:204-213.

Taxman, R.M. (1963) Incidence and size of the juxtamastoid eminence in modern crania. Am. J. Phys. Anthropol. N.S. 21:153-157.

Tisserand, -. (1945) Les variations d'insertion du lobule de l'oreille dans la population Francaise. Bull. et Mém. de la Soc. d'Antrhrop. de Paris 6:112-130.

Tobeck, A. (1938) über den Verlauf des Facialkanals im Röntgenbild. Arch. Ohr. Nas. Kehlk. Heil. 144:276-289.

Vitali, G. (1905) Osselets crâniens exoccipito-sur-occipitaux et pétroexoccipito-sus- occipitaux chez l'homme. Arch. Ital. Biol. 44:115.

von Frey, K.W. (1965) Die Tomographie der Labyrinthmissbildung. Fortschritte Röntgenstrahlen. 102:1-13.

von Lanz, T und W. Wachsmuth. (1955) Parktische Anatomie., Hals., Springer-Verlag., Berlin, Göttingen and Heidelberg.

Weissman, J.L., Arriaga, M., Curtin, H.D. and B. Hirsch. (1991) Duplication anomaly of the internal auditory canal. AJNR 12:867-869.

Williams, G.H. (1990) Developmental Anatomy of th e Ear. In: English, G.M., ed. Otolaryngology. Lippincott, Philadelphia. Pp. 1-67.

Wilmot, T. (1970) Hereditary conductive deafness due to incusstapes abnormalities and associated with pinna deformity. J. Laryngol. Otol. 84:469-479.

Ziolkowski, M. and W. Kurlej. (1983) Subarcuate fossa. Folia Morphol. (Warsaw) 42:175-186.

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