Evaluation of Variations of the Chorda Tympani Nerve Originating from The Facial Nerve on High Resolution CT

Mehmet Ali Özel; Ramazan Büyükkaya

Makale detayları

Evaluation of Variations of the Chorda Tympani Nerve Originating from The Facial Nerve on High Resolution CT

Yazarlar:

Mehmet Ali Özel | Ramazan Büyükkaya

Yayıncı:

Duzce University

Ana Başlıklar:

Health Services and Systems (Other)

Dergi:

Konuralp Medical Journal Vol.17 Issue 2, pp.137-143

Belge Tipi:

Makale

Yayın Tarihi:

6/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001350701

pISSN:

1309-3878

Anahtar kelimeler:

Özet:

 Objective: The aim of this study is to define the anatomical variations of the chorda tympani nerve originating from the facial nerve on high resolution CT HRCT. Method: A retrospective study of 100 patients who underwent temporal bone HRCT imaging in Duzce University, Department of Radiology. Individuals with normal bone structure at least on one side, were included in the study. Multiplanar reconstruction images were created then chorda tympani was imaged and measurements were performed. Results: Thirty-seven bone were excluded. When the originating localizations of the chorda tympani from the facial nerve were examined, 1911.7 anterior, 8552.1 anterolateral, 5533.7 lateral and 42.5 posterolateral origins. The distance from the origin of the chorda tympani to the stylomastoid foramen was measured as 3.71.6 mm. The originating angle of the chorda tympani from the facial nerve was measured as 28.210.7º. The widest distance between the chorda tympani and the mastoid segment of the facial nerve was measured as 2.30.6mm. The furthest distance between the mastoid segment of the facial nerve and chorda tympani is inversely correlated with the distance between chorda tympani and stylomastoid foramen. The angle of originating chorda tympani from facial nerve is directly correlated with the distance between chorda tympani and stylomastoid foramen. The ratio of extratemporal branching of chorda tympani is 2.4. Conclusions: The chorda tympani can be clearly seen on axial and reformat images on HRCT. Preoperative evaluation of the chorda tympani nerve might help to plan the surgical approach and thus prevent iatrogenic injury during middle ear surgery.

 Objective: The aim of this study is to define the anatomical variations of the chorda tympani nerve originating from the facial nerve on high resolution CT HRCT. Method: A retrospective study of 100 patients who underwent temporal bone HRCT imaging in Duzce University, Department of Radiology. Individuals with normal bone structure at least on one side, were included in the study. Multiplanar reconstruction images were created then chorda tympani was imaged and measurements were performed. Results: Thirty-seven bone were excluded. When the originating localizations of the chorda tympani from the facial nerve were examined, 1911.7 anterior, 8552.1 anterolateral, 5533.7 lateral and 42.5 posterolateral origins. The distance from the origin of the chorda tympani to the stylomastoid foramen was measured as 3.71.6 mm. The originating angle of the chorda tympani from the facial nerve was measured as 28.210.7º. The widest distance between the chorda tympani and the mastoid segment of the facial nerve was measured as 2.30.6mm. The furthest distance between the mastoid segment of the facial nerve and chorda tympani is inversely correlated with the distance between chorda tympani and stylomastoid foramen. The angle of originating chorda tympani from facial nerve is directly correlated with the distance between chorda tympani and stylomastoid foramen. The ratio of extratemporal branching of chorda tympani is 2.4. Conclusions: The chorda tympani can be clearly seen on axial and reformat images on HRCT. Preoperative evaluation of the chorda tympani nerve might help to plan the surgical approach and thus prevent iatrogenic injury during middle ear surgery.

 Objective: The aim of this study is to define the anatomical variations of the chorda tympani nerve originating from the facial nerve on high resolution CT HRCT. Method: A retrospective study of 100 patients who underwent temporal bone HRCT imaging in Duzce University, Department of Radiology. Individuals with normal bone structure at least on one side, were included in the study. Multiplanar reconstruction images were created then chorda tympani was imaged and measurements were performed. Results: Thirty-seven bone were excluded. When the originating localizations of the chorda tympani from the facial nerve were examined, 1911.7 anterior, 8552.1 anterolateral, 5533.7 lateral and 42.5 posterolateral origins. The distance from the origin of the chorda tympani to the stylomastoid foramen was measured as 3.71.6 mm. The originating angle of the chorda tympani from the facial nerve was measured as 28.210.7º. The widest distance between the chorda tympani and the mastoid segment of the facial nerve was measured as 2.30.6mm. The furthest distance between the mastoid segment of the facial nerve and chorda tympani is inversely correlated with the distance between chorda tympani and stylomastoid foramen. The angle of originating chorda tympani from facial nerve is directly correlated with the distance between chorda tympani and stylomastoid foramen. The ratio of extratemporal branching of chorda tympani is 2.4. Conclusions: The chorda tympani can be clearly seen on axial and reformat images on HRCT. Preoperative evaluation of the chorda tympani nerve might help to plan the surgical approach and thus prevent iatrogenic injury during middle ear surgery.

 Amaç: Bu çalışmanın amacı, fasiyal sinirden köken alan korda timpani sinirinin anatomik varyasyonlarını yüksek çözünürlüklü BT de HRCT tanımlamaktır. Yöntem: Düzce Üniversitesi Radyoloji Anabilim Dalı nda temporal kemik HRCT görüntülemesi yapılan 100 hastanın görüntüleri retrospektif olarak değerlendirildi. En azından bir tarafta normal temporal kemik yapısına sahip bireyler çalışmaya dahil edildi. Multiplanar rekonstrüksiyon görüntüleri oluşturulduktan sonra korda timpani görüntülendi ve ölçümler yapıldı. Bulgular: 200 temporal kemikten 37si çalışma dışında tutuldu. Korda timpaninin fasiyal sinirden çıkış lokalizasyonları incelendiğinde, 19 11,7 anterior, 85 52,1 anterolateral, 55 33,7 lateral ve 4 2,5 posterolateral orijinliydi. Korda timpaninin orijini ile stilomastoid foramen arası mesafe 3.71.6 mm olarak ölçüldü. Korda timpaninin fasiyal sinirden çıkış açısı 28.210.7º olarak ölçüldü. Korda timpani ile fasiyal sinirin mastoid segmenti arasındaki en geniş mesafe 2.30.6 mm olarak ölçüldü. Fasiyal sinirin mastoid segmenti - korda timpani arasındaki en uzak mesafe ile korda timpani - stilomastoid foramen arasındaki mesafe ters orantılıdır. Korda timpaninin fasiyal sinirden çıkış açısı, korda timpani ile stilomastoid foramen arasındaki mesafe doğrudan ilişkilidir. Korda timpaninin ekstratemporal dallanma oranı 2,4tür. Sonuç: Korda timpani, HRCT de aksiyel ve reformat görüntülerde açıkça görülebilir. Korda timpaninin operasyon öncesi değerlendirilmesi, cerrahi yaklaşımı planlamaya ve böylece orta kulak cerrahisi sırasında iatrojenik yaralanmayı önlemeye yardımcı olabilir.

Makale detayları

Evaluation of Variations of the Chorda Tympani Nerve Originating from The Facial Nerve on High Resolution CT

Yazarlar:

Mehmet Ali Özel | Ramazan Büyükkaya

Yayıncı:

Duzce University

Ana Başlıklar:

Health Services and Systems (Other)

Dergi:

Konuralp Medical Journal Vol.17 Issue 2, pp.137-143

Belge Tipi:

Makale

Yayın Tarihi:

6/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001350701

pISSN:

1309-3878

Chorda Tympani

Facial Recess

High Resolution CT

Facial Nerve

Posterior Tympanotomy

Temporal BoneKorda Timpani

Fasiyal Reses

Yüksek Çözünürlüklü BT

Fasiyal Sinir

Posterior Timpanotomi

Temporal Kemik

Sayı

Makale detayları

Yazarlar: Mehmet Ali Özel | Ramazan Büyükkaya

Yayıncı: Duzce University

Ana Başlıklar: Health Services and Systems (Other)

Dergi: Konuralp Medical Journal Vol.17 Issue 2, pp.137-143

Belge Tipi: Makale

Yayın Tarihi: 6/2025

Belge Dili: İngilizce

Document ID (Org No.): 2001350701

pISSN: 1309-3878

Sayı

Yazarlar:

Mehmet Ali Özel | Ramazan Büyükkaya

Yayıncı:

Duzce University

Ana Başlıklar:

Health Services and Systems (Other)

Dergi:

Konuralp Medical Journal Vol.17 Issue 2, pp.137-143

Belge Tipi:

Makale

Yayın Tarihi:

6/2025

Belge Dili:

İngilizce

Document ID (Org No.):

2001350701

pISSN:

1309-3878