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Variations of the 6th cranial nerve (nervus abducens) in the petroclival region: A microsurgical study.
Morphologie 2019; 103(341 Pt 2):103-109M

Abstract

The aim of this study is to present the variations of nervus abducens in localization and number as it pierces the clival dura mater. The calvaria of 16 cadaveric heads were removed by making horizontal incisions from Glabella to Inion in both sides of the head. The dura mater was dissected. Cerebrum and cerebellum were taken out by obtuse dissection. Dissections of cavernous sinus were made under the stereomicroscope and the findings were photographed. Out of 16 specimens, one of them was excluded. Fifteen heads were bilaterally analyzed. Analysis of these nerves presented four different variations. Variation types a classified CN VI as a single trunk and entering a single dural pore with 77% occurrence. Variation type b classified CN VI with two branches running in the petroclival region and entering a single dural pore with 10% occurrence. Variation type c classified CN VI as 2 trunks and entering 2 separate but close dural pores with 10% occurrence. Variation type d classified CN VI with 2 distinct trunks and 2 branches entering 2 separate but close dural pores with 3% occurrence. CN VI plays a major role in the clinic of the eye. Due to its intracranial and extracranial course, injuries to the head and to the nerve may result in malfunctioning of the lateral muscles of the eye. Therefore, the variations of branching, relations and its course were analyzed.

Authors+Show Affiliations

School of Medicine, Bahcesehir University Istanbul, Turkey.School of Medicine, Bahcesehir University Istanbul, Turkey.School of Medicine, Bahcesehir University Istanbul, Turkey.School of Medicine, Bahcesehir University Istanbul, Turkey.School of Medicine, Bahcesehir University Istanbul, Turkey.School of Medicine, Bahcesehir University Istanbul, Turkey.Department of Anatomy-Chair, School of Medicine, Bahcesehir University, Istanbul, Turkey. Electronic address: gurselortug@gmail.com.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30713002

Citation

Ipsalali, H O., et al. "Variations of the 6th Cranial Nerve (nervus Abducens) in the Petroclival Region: a Microsurgical Study." Morphologie : Bulletin De l'Association Des Anatomistes, vol. 103, no. 341 Pt 2, 2019, pp. 103-109.
Ipsalali HO, Ciftci AC, Kilic D, et al. Variations of the 6th cranial nerve (nervus abducens) in the petroclival region: A microsurgical study. Morphologie. 2019;103(341 Pt 2):103-109.
Ipsalali, H. O., Ciftci, A. C., Kilic, D., Sendemir, G., Seyhan, S., Kaya, I., & Ortug, G. (2019). Variations of the 6th cranial nerve (nervus abducens) in the petroclival region: A microsurgical study. Morphologie : Bulletin De l'Association Des Anatomistes, 103(341 Pt 2), pp. 103-109. doi:10.1016/j.morpho.2019.01.001.
Ipsalali HO, et al. Variations of the 6th Cranial Nerve (nervus Abducens) in the Petroclival Region: a Microsurgical Study. Morphologie. 2019;103(341 Pt 2):103-109. PubMed PMID: 30713002.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Variations of the 6th cranial nerve (nervus abducens) in the petroclival region: A microsurgical study. AU - Ipsalali,H O, AU - Ciftci,A C, AU - Kilic,D, AU - Sendemir,G, AU - Seyhan,S, AU - Kaya,I, AU - Ortug,G, Y1 - 2019/02/01/ PY - 2018/10/17/received PY - 2019/01/09/revised PY - 2019/01/10/accepted PY - 2019/2/5/pubmed PY - 2019/2/5/medline PY - 2019/2/5/entrez KW - Abducens nerve KW - Microsurgery KW - Middle cranial fossa KW - Neuroanatomy KW - Skull base surgery SP - 103 EP - 109 JF - Morphologie : bulletin de l'Association des anatomistes JO - Morphologie VL - 103 IS - 341 Pt 2 N2 - The aim of this study is to present the variations of nervus abducens in localization and number as it pierces the clival dura mater. The calvaria of 16 cadaveric heads were removed by making horizontal incisions from Glabella to Inion in both sides of the head. The dura mater was dissected. Cerebrum and cerebellum were taken out by obtuse dissection. Dissections of cavernous sinus were made under the stereomicroscope and the findings were photographed. Out of 16 specimens, one of them was excluded. Fifteen heads were bilaterally analyzed. Analysis of these nerves presented four different variations. Variation types a classified CN VI as a single trunk and entering a single dural pore with 77% occurrence. Variation type b classified CN VI with two branches running in the petroclival region and entering a single dural pore with 10% occurrence. Variation type c classified CN VI as 2 trunks and entering 2 separate but close dural pores with 10% occurrence. Variation type d classified CN VI with 2 distinct trunks and 2 branches entering 2 separate but close dural pores with 3% occurrence. CN VI plays a major role in the clinic of the eye. Due to its intracranial and extracranial course, injuries to the head and to the nerve may result in malfunctioning of the lateral muscles of the eye. Therefore, the variations of branching, relations and its course were analyzed. SN - 1286-0115 UR - https://www.unboundmedicine.com/medline/citation/30713002/Variations_of_the_6th_cranial_nerve_(nervus_abducens)_in_the_petroclival_region:_A_microsurgical_study L2 - https://linkinghub.elsevier.com/retrieve/pii/S1286-0115(19)30001-3 DB - PRIME DP - Unbound Medicine ER -