Surgical Anatomy Of The Geniculate Ganglion

M, Dobozi

doi:10.3109/00016487509121309

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…Despite the fact that it contains the geniculate ganglion, this ganglion only occupies a third part of this segment. The geniculate ganglion usually has a pyramidal shape with a length of 1–2 mm (Dobozi, ; Nawar et al, ). The apex of the pyramid is anterolaterally oriented and marks the origin of the greater superficial petrosal nerve.…”

Section: Discussionmentioning

confidence: 99%

“…Usually the dimensions of the ganglion are rather constant, with only slight variations among individuals (Dobozi, ). It is not uncommon an incomplete ossification of the dural surface of the geniculate segment that leaves the ganglion denuded and exposed to the middle cranial fossa (Rhoton et al, ; Isaacson and Vrabec, ).…”

Section: Discussionmentioning

confidence: 99%

“…The geniculate ganglion is located between the labyrinthine and horizontal segments of the FN. Despite the fact that it contains the geniculate ganglion, this ganglion only occupies a third part of this segment and the apex of the ganglion marks the origin of the superficial petrosal nerve (Dobozi, ; Nawar et al, ). The horizontal segment of the FN starts at the geniculate ganglion and courses posteroinferiorly between the cochleariform process and the epitympanic crest toward the tympanic segment (between the stapes and the lateral semicircular canal) until the second genu to become the mastoid or vertical portion.…”

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confidence: 99%

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Anatomical Variations of the Intrapetrous Portion of the Facial Nerve

Arístegui

Martin-Oviedo

Aristegui

et al. 2018

The Anatomical Record

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The intrapetrous facial nerve has the second longest intraosseous course of all cranial nerves, after the mandibular nerve. But it is by far the most complex considering the anatomical structures closely related to it. The auditory and vestibular portions of the inner ear, the dura of the middle fossa and posterior fossa, the sigmoid sinus and jugular bulb, and the internal carotid artery are close enough to merit attention. This article includes an anatomical study on 100 temporal bones with anatomical references as seen from the middle fossa and from the transmastoid approaches that may help identifying the facial nerve and protecting surrounding structures. Anatomical variability was present and noteworthy when considering the venous drainage system through the temporal bone and the mastoid pneumatization. The distance from the geniculate ganglion to the hiatus falopii offered the highest variability with a range of 0 to 7.75 mm and a mean of 3.30 mm. The geniculate ganglion was dehiscent in 20.8% of the specimens and the superior semicircular canal was spontaneously blue‐lined in 27% of the cases. Through the transmastoid approach, the highest variability was found regarding the distance between the vertical portion of the facial nerve and the jugular bulb (range from 1.5 to 10.0 mm), the sigmoid sinus (range from 0 to 13.25 mm) and the internal carotid artery (range from 6.0 to 15.0 mm). This study highlights the importance of the relative variability of the facial nerve to other surrounding structures within the petrous portion of the temporal bone. Anat Rec, 302:588–598, 2019. © 2018 Wiley Periodicals, Inc.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Anatomical Variations of the Intrapetrous Portion of the Facial Nerve

Arístegui

Martin-Oviedo

Aristegui

et al. 2018

The Anatomical Record

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“…Dobozi [18] measured the geniculate ganglion from histological sections of the temporal bone. He found that in the horizontal plane the ganglion is triangular in shape and has an average length of 1.09 mm; the average width of this structure is 0.76 mm with an average height of 0.6 to 0.8 mm.…”

Section: Discussionmentioning

confidence: 99%

Dissection and Exposure of the Whole Course of Deep Nerves in Human Head Specimens after Decalcification

Liu

Arnold

Robinson

2012

International Journal of Otolaryngology

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The whole course of the chorda tympani nerve, nerve of pterygoid canal, and facial nerves and their relationships with surrounding structures are complex. After reviewing the literature, it was found that details of the whole course of these deep nerves are rarely reported and specimens displaying these nerves are rarely seen in the dissecting room, anatomical museum, or atlases. Dissections were performed on 16 decalcified human head specimens, exposing the chorda tympani and the nerve connection between the geniculate and pterygopalatine ganglia. Measurements of nerve lengths, branching distances, and ganglia size were taken. The chorda tympani is a very fine nerve (0.44 mm in diameter within the tympanic cavity) and approximately 54 mm in length. The mean length of the facial nerve from opening of internal acoustic meatus to stylomastoid foramen was 52.5 mm. The mean length of the greater petrosal nerve was 26.1 mm and nerve of the pterygoid canal was 15.1 mm.

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“…[9,19] Considerable investigation into neurotmesis and its avoidance has been accomplished in idiopathic facial palsy, herpes zoster oticus, and traumatic facial palsy. [6] In anatomical studies of temporal bones Dobozi [5] has demonstrated that the fallopian canal is narrowest in relation to facial nerve diameter in its labyrinthine segment. Gantz, et al, [7] have shown with intraoperative evoked electromyography (EMG) in idiopathic palsies that the block to axonal impulse conductivity is found in the labyrinthine segment.…”

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confidence: 99%

Decompression of the labyrinthine segment of the facial nerve in acoustic neuroma surgery: a consideration for minimizing postoperative delayed facial nerve dysfunction

Holliday¹,

Sampath²

1998

FOC

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Delayed facial nerve palsy, a condition characterized by spontaneous deterioration of facial nerve function in patients who had otherwise normal or near-normal facial function in the immediate postoperative period, has been reported in 15 to 29% of patients undergoing microsurgical resection of vestibular schwannomas. One putative mechanism for its occurrence suggests that edematous entrapment of the facial nerve in the meatal foramen (the narrowest segment of the internal auditory canal) may lead to nerve ischemia or necrosis and subsequent facial nerve dysfunction. To assess whether meatal decompression may help reduce the incidence of delayed facial nerve palsy during microsurgical resection of acoustic tumors, we compared 25 patients undergoing translabyrinthine removal of acoustic neuromas who received prophylactic decompression of the labyrinthine segment of the facial nerve (Group 1) with 40 patients who did not receive facial nerve decompression (Group 2). No patients in Group 1 had a delayed progressive facial paralysis with degeneration. In contrast, when Group 2 patients with larger, average-sized tumors were reviewed, eight patients (20%) developed delayed degeneration. These findings suggest that decompression of the labyrinthine segment may be of value in acoustic tumor surgery in reducing delayed facial nerve dysfunction. Further study is indicated in this important area.

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Surgical Anatomy Of The Geniculate Ganglion

Cited by 15 publications

References 4 publications

Anatomical Variations of the Intrapetrous Portion of the Facial Nerve

Anatomical Variations of the Intrapetrous Portion of the Facial Nerve

Dissection and Exposure of the Whole Course of Deep Nerves in Human Head Specimens after Decalcification

Decompression of the labyrinthine segment of the facial nerve in acoustic neuroma surgery: a consideration for minimizing postoperative delayed facial nerve dysfunction

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