LXXVI The Fetal and Early Postnatal Development of the Tympanic Ring and Related Structures in Man

Anson, Barry J.; Bast, Theodore H.; Richany, Shafik F.

doi:10.1177/000348945506400312

Cited by 66 publications

(41 citation statements)

References 11 publications

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“…The tympanic bone is still incompletely developed at birth, and a foramen may persist in the anteroinferior aspect of the EAC. 5,6 The persistence of such foramina is estimated to occur in approximately 7% of individuals and may predispose to temporomandibular abnormalities or fistulas between the ear canal and the parotid gland. 7 Salivary otorrhea during mastication and resultant otologic complications have been previously reported.…”

Section: Workmentioning

confidence: 99%

Persistent Foramen of Huschke Mimicking a Branchial Cleft Anomaly

Silva¹,

Collins²

2012

Arch Otolaryngol Head Neck Surg

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A persistent foramen of Huschke, or foramen tympanicum, results from the defective ossification of the anteroinferior aspect of the tympanic portion of the temporal bone. We describe 2 girls, aged 5 and 6 years, with histories of recurrent cervical abscesses, draining submandibular sinuses, and defective tympanic plates adjacent to the tympanic ring. Surgical resection of the fistulous tract extending from the submandibular triangle to the bony ear canal successfully controlled the symptoms. REPORT OF CASES CASE 1A 5-year-old girl presented to a tertiary care pediatric otolaryngology outpatient clinic with a history of swelling in the anterior aspect of the left side of her neck. She had the sudden onset of left submandibular swelling and erythema 5 weeks before presentation, which then developed into cutaneous drainage and improved after the administration of intravenous antibiotics at a different institution. Her medical history was remarkable for a tympanoplasty and mastoidectomy that had been performed on that same side 1 year earlier, with a diagnosis of chronic suppurative otitis media. On physical examination, she had a draining sinus that was surrounded by granulation tissue right above the hyoid but was afebrile and nontoxic. Computed tomography (CT) revealed a tract extending from the cervical skin up into the bony external auditory canal (EAC) through a dysmorphic anteroinferior wall (Figure 1). The patient was then taken to the operating suite, and the tract was resected through a superficial parotidectomy approach, with facial nerve identification and preservation. The tract extended into the styloid process, which was amputated and packed with a fat plug. Examination of the surgical specimen revealed a 3-cm-long fibrotic tract with acute and chronic inflammation. There were no complications or evidence of recurrence during the 1-year follow-up period. CASE 2A 6-year-old girl presented to the emergency department with the sudden onset of right submandibular swelling, tenderness, and erythema. Associated symptoms also included right-sided otalgia and otorrhea. Her medical history was notable for 2 previous procedures for excision of right submandibular cysts. On physical examination, she had a draining sinus approximately 1 cm below the right angle of the mandible as well as substantial otorrhea and granulation tissue occluding the ear canal. A CT of the neck with contrast showed significant inflammatory changes in the parotid gland, temporomandibular joint, and parapharyngeal space. A superficial parotid fluid collection was drained, and oral and ototopical antibiotic therapy was initiated. After the infection subsided, the results of magnetic resonance imaging confirmed the CT findings of a fistulous tract extending from the submandibular area into the medial aspect of the EAC through a dysmorphic styloid bone and an anteroinferior wall (Figure 2). The patient was also

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Section: Workmentioning

confidence: 99%

Persistent Foramen of Huschke Mimicking a Branchial Cleft Anomaly

Silva¹,

Collins²

2012

Arch Otolaryngol Head Neck Surg

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“…Ossification defects like the tympanic fenestra therefore cannot be ascribed to imperfect replacement of a cartilaginous preformation. The conventional description of fenestral formation in the human specifies that, during the first year of life, the rostral and caudal crura of the U-shaped ectoympanic send out platelike expansions that meet centrally to form the floor of the developing external acoustic meatus and tympanic cavity (Anson et al, 1955). Typically, a small, unossified zone remains for a time between these expansions.…”

Section: Character Analysismentioning

confidence: 99%

Basicranial Morphology and Relationships of Antillean Heptaxodontidae (Rodentia, Ctenohystrica, Caviomorpha)

MacPhee¹

2011

Bulletin of the American Museum of Natural History

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“…This implies that the angular stiffness of the neonatal ossicle may possibly be smaller than that of adults to the same extent, and that the difference in the resonance frequency of the middle ear in adults/children and neonates is limited to a few hundred-Hertz range at around 1 kHz. In contrast, the external ear canal is not completely formed until about 1 year of age (Anson et al, 1955;Anson and Donaldson, 1981). The neonatal external ear canal is about 50% shorter in length and diameter than that of adults, which means that the ear canal volume in neonates is about one-tenth of that of adults (Keefe and Levi, 1996;McLellan and Webb, 1957;Noh and Lee, 2012;Saunders et al, 1983;Qi et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Analysis by finite element method of dynamic characteristics of the external ear canal in neonates

Murakoshi

Takeda

Wada

2017

JBSE

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Although early diagnosis and treatment of hearing disorders in neonates is highly effective for realization of linguistic competence and intellectual development, the diagnostic accuracy in the initial period of life is low. To overcome this problem, extensive research studies to diagnose the neonatal hearing with tympanometry, multifrequency tympanometry, the wideband acoustic transfer function technique, the sweep frequency impedance (SFI) technique and others have been conducted. However, since the results obtained are not consistent with those obtained in adults/children, diagnosis of hearing in neonates has been problematic. The difference in the dynamic characteristics of the hearing apparatus between adults/children and neonates, especially due to the morphological difference in the external ear canal, has been suggested as a possible reason for such problem. However, the dynamics of the neonatal hearing system has not yet been clarified. In the present study, therefore, three types of finite-element models of the neonatal external ear were developed and their dynamic characteristics (i.e., natural frequencies and mode shapes) were investigated. Frequency analyses of the constructed models revealed that the neonatal external ear canal wall has a resonance of around 0.3 kHz and that this resonance leads to the volume change of such canal. This result suggests that the neonatal external ear canal wall may exhibit intrinsic oscillatory behavior if conventional tympanometry with a probe tone of 226 Hz is performed, affecting the diagnostic data in neonates.

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LXXVI The Fetal and Early Postnatal Development of the Tympanic Ring and Related Structures in Man

Cited by 66 publications

References 11 publications

Persistent Foramen of Huschke Mimicking a Branchial Cleft Anomaly

Persistent Foramen of Huschke Mimicking a Branchial Cleft Anomaly

Basicranial Morphology and Relationships of Antillean Heptaxodontidae (Rodentia, Ctenohystrica, Caviomorpha)

Analysis by finite element method of dynamic characteristics of the external ear canal in neonates

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