Bony landmarks as an aid for intraoperative facial nerve identification

Greyling, Linda M.; Glanvill, R; Boon, Jo; Schabort, D.; Meiring, J.H.; Pretorius, Jannie; Schoor, Albert-Neels Van

doi:10.1002/ca.20508

Cited by 26 publications

(16 citation statements)

References 7 publications

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“…8 Greyling et al found the distance as 0.91 AE 0.20 cm on the left side and 0.93 AE 0.16 cm on the right side. 9 Our values (1.60-cm right side and 1.57-cm left side) were different from their values as they have done the study on the dissected cadaver and we have done it directly on the bone.…”

Section: Discussionmentioning

confidence: 67%

A Morphometric Study of Stylomastoid Foramen with Its Clinical Applications

Tewari

Gupta

Palimar

2020

J Neurol Surg B Skull Base

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Background To prevent damage to the facial nerve while doing surgery and to give facial nerve block by anesthetics near the stylomastoid foramen we should know its distance from the important anatomical landmarks. So, this study aims to study the location of stylomastoid with respect to nearby anatomical landmarks. Materials and Method The study was performed on 58 dry skulls. Measurements of stylomastoid foramen were taken from various anatomical landmarks on both sides of the skull. Data analysis was done by using the Statistical Package for Social Sciences (SPSS) 19 version. Results The mean distance of the center of the stylomastoid foramen (CSMF) to the tip of the mastoid process was 1.60, 1.57 cm on the right and left side, respectively. The mean distance of CSMF to the upper end of the anterior border of the mastoid process was 1.42, 1.39 cm on the right and left side, respectively. The mean angle between CSMF and tip of the mastoid process was 51.6 degrees, 53.5 degrees on right and left side, respectively. The mean distance of CSMF to the center of jugular foramen was 1.27, 1.26 cm on the right and left side, respectively. The position of the stylomastoid foramen in relation to a transverse line passing through the upper end of the anterior border of both mastoid processes was anterior in 82.7%, 94.8% of cases on the right and left side, respectively. Conclusion These measurements will aid neurosurgeons in doing surgeries near the stylomastoid foramen or anesthetics to give facial nerve block near the foramen.

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Section: Discussionmentioning

confidence: 67%

A Morphometric Study of Stylomastoid Foramen with Its Clinical Applications

Tewari

Gupta

Palimar

2020

J Neurol Surg B Skull Base

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“…Greyling et al [10] demonstrated that the mean distance between the mastoid process and facial nerve for the left was 9.18 ± 2.05 mm and for the right, 9.35 ± 1.67 mm on cadaver dissection.…”

Section: Discussionmentioning

confidence: 99%

Identification of Facial Nerve During Parotidectomy: A Combined Anatomical & Surgical Study

Pal

Sengupta

Chowdhury

et al. 2013

Indian J Otolaryngol Head Neck Surg

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To find out the most easily identifiable and anatomically consistent landmark for identification of facial nerve during parotid surgery. Ten cadaveric dissections and ten live parotid surgeries for different types of parotid tumours were done. Cadaveric dissection was performed in the Department of Anatomy and the surgeries were done in the Department of ENT and Head and Neck surgery of R. G. Kar Medical College of Kolkata. The distance of the facial nerve trunk from three most commonly used landmarks (viz., tympanomastoid suture, tragal pointer and posterior belly of digastric muscle) was measured in both cadaver and live patients. The ease of identification of the nerve trunk using each of the landmarks, particularly during live surgery was also assessed. The mean distance of the tympanomastoid suture from the facial nerve trunk was 3.5 mm (cadaver) and 3.87 mm (live surgery), the tragal pointer was found to be at a mean distance of 16.61 mm (cadaver) and 16.36 mm (live surgery) and in case of the posterior belly of digastric muscle it was 7.41 mm (cadaver) and 8.03 mm (live surgery). During live surgery the posterior belly of digastric was found to be the most easily identifiable landmark with a consistent anatomical relationship with the nerve trunk. The posterior belly of digastric muscle is the most easily identifiable and a very consistent landmark for facial nerve dissection during parotidectomy. When supplemented with the tragal pointer, accuracy in identifying the facial nerve trunk is very high, thereby avoiding inadvertent injury to the nerve trunk.

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“…15 Bony landmarks to identify the facial nerve were proposed in another cadaveric study. 16 The usefulness of these approaches in live surgery has not been tested.…”

Section: Discussionmentioning

confidence: 99%

Easy and Safe Method for Facial Nerve Identification in Parotid Surgery

et al. 2015

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Background A safe and easy anatomical landmark is proposed to identify the facial nerve in parotid surgery. The facial nerve forms the center point between the base of the styloid process and the origin of the posterior belly of the digastric muscle. Objective To evaluate the consistency, accuracy, and safety of the landmark in identifying the facial nerve. Methods The study was designed in three steps: a cadaver study, a radiologic study, and a prospective clinical study. Anatomy was initially studied in two cadavers. Then the images of 200 temporal styloid regions were studied for consistency of the presence of the styloid base. In the second part of the radiologic study, the distance between the styloid base and the origin of the posterior belly of the digastric muscle was studied in 50 parotid regions. The clinical study involved 25 patients who underwent parotidectomy. Results The styloid base was present in all the images studied. The mean distance between the styloid base and the origin of the posterior belly of the digastric was found to be 0.72 cm (range: 0.45-0.99 cm). The facial nerve could be identified consistently and safely in all patients. Conclusion This trident landmark provided safe, accurate, and easy identification of the facial nerve using two fixed bony landmarks.

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Bony landmarks as an aid for intraoperative facial nerve identification

Cited by 26 publications

References 7 publications

A Morphometric Study of Stylomastoid Foramen with Its Clinical Applications

A Morphometric Study of Stylomastoid Foramen with Its Clinical Applications

Identification of Facial Nerve During Parotidectomy: A Combined Anatomical & Surgical Study

Easy and Safe Method for Facial Nerve Identification in Parotid Surgery

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