The abducens nerve

1974 ◽  
Vol 41 (5) ◽  
pp. 561-566 ◽  
Author(s):  
Hilel Nathan ◽  
Georges Ouaknine ◽  
Isaac Z. Kosary
Keyword(s):  
Cavernous Sinus ◽  
Subarachnoid Space ◽  
Cranial Nerve ◽  
Rectus Muscle ◽  
Abducens Nerve ◽  
The Other ◽  
Sixth Cranial Nerve ◽  
Content Type ◽  
Lateral Rectus Muscle ◽  
Fine Print

✓ The authors describe the origins and course of the sixth cranial nerve in 62 cadaver or autopsy cases and describe three patterns. In Pattern 1 the nerve originates and runs all its way as a single trunk. In Pattern 2 it originates as a single trunk, but splits into two branches in the subarachnoid space, while in Pattern 3 it originates as two separate trunks. In both Patterns 2 and 3 the trunks perforate the dura mater independently and enter the cavernous sinus by passing one above and the other below the petrosphenoidal ligament. In the sinus the two trunks fuse into a single trunk which then continues to the lateral rectus muscle. The practical neurological importance of these variations is discussed.

Intracranial sympathetic pathways associated with the sixth cranial nerve

1974 ◽  
Vol 40 (2) ◽  
pp. 236-243 ◽  
Author(s):  
J. A. Johnston ◽  
Dwight Parkinson
Keyword(s):  
Cavernous Sinus ◽  
Cranial Nerve ◽  
Abducens Nerve ◽  
Sixth Cranial Nerve ◽  
Content Type ◽  
Photographic Documentation ◽  
Parasellar Region ◽  
Fine Print

✓ During a continuing study of the anatomy of the parasellar region, a macroscopically identifiable nerve has been observed to leave the foramen lacerum and join the abducens nerve within the cavernous sinus. A description and photographic documentation of this sympathetic branch to the fifth cranial nerve by way of the sixth cranial nerve are presented.

Outcome of aggressive removal of cavernous sinus meningiomas

1994 ◽  
Vol 81 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Franco DeMonte ◽  
Harold K. Smith ◽  
Ossama Al-Mefty
Keyword(s):  
Cavernous Sinus ◽  
Cranial Nerve ◽  
The Other ◽  
Surgical Removal ◽  
Content Type ◽  
Formidable Challenge ◽  
Acute Hypothyroidism ◽  
Total Tumor Removal ◽  
Subtotal Removal ◽  
Fine Print

✓ Despite recent advances in surgery of the cavernous sinus, meningiomas in that area offer a formidable challenge. The rationale for aggressive surgical removal of cavernous sinus meningiomas is based on the presumption that the extent of removal is inversely related to the rate of recurrence. Over the past 10 years, 41 patients with histologically benign meningiomas involving the cavernous sinus underwent aggressive surgery. Total removal, as confirmed by intraoperative inspection and postoperative radiological studies, was achieved in 31 patients (76%). Twelve patients have been followed for more than 5 years; 10 underwent total tumor removal and only one of these experienced recurrence (5 years after surgery). The other two patients underwent subtotal removal and had symptomatic and radiological evidence of regrowth 3 and 4 years after surgery. Pre-existing cranial nerve deficits improved in only 14% of the patients, remained unchanged in 80%, and worsened permanently in 6%. Seven patients experienced a total of 10 new cranial nerve deficits, four of which involved the nerves subserving ocular motor function. Extraocular muscle function did not worsen in the 25 patients with a seeing eye ipsilateral to the tumor, and no instance of visual worsening occurred. Two patients died 4 months after surgery, one from severe delayed vasospasm and hypothalamic infarction and the other because of a myocardial infarction. Another patient died from a pulmonary embolus on the 9th postoperative day. There were three instances of cerebral ischemia; one was transient, lasting less than 24 hours, while two were related to injury of the middle cerebral artery and resulted in residual hemiplegia. Other complications included three cases of nonfatal pulmonary emboli, two cerebrospinal fluid leaks, and one instance each of exposure keratitis, acute hypothyroidism, and cerebral edema.

Duplication of the Abducens Nerve at the Petroclival Region: An Anatomic Study

Neurosurgery ◽  
2003 ◽  
Vol 52 (3) ◽  
pp. 645-652 ◽  
Author(s):  
M. Faik Ozveren ◽  
Bulent Sam ◽  
Ismail Akdemir ◽  
Alpay Alkan ◽  
Ibrahim Tekdemir ◽  
...  
Keyword(s):  
Histological Examination ◽  
Cavernous Sinus ◽  
Clinical Importance ◽  
Rectus Muscle ◽  
Abducens Nerve ◽  
The Other ◽  
Lateral Rectus ◽  
Petrous Apex ◽  
Jugular Veins ◽  
Lateral Rectus Muscle

Abstract OBJECTIVE During its course between the brainstem and the lateral rectus muscle, the abducens nerve usually travels forward as a single trunk, but it is not uncommon for the nerve to split into two branches. The objective of this study was to establish the incidence and the clinical importance of the duplication of the nerve. METHODS The study was performed on 100 sides of 50 autopsy materials. In 10 of 11 cases of duplicated abducens nerve, colored latex was injected into the common carotid arteries and the internal jugular veins. The remaining case was used for histological examination. RESULTS Four of 50 cases had duplicated abducens nerve bilaterally. In seven cases, the duplicated abducens nerve was unilateral. In 9 of these 15 specimens, the abducens nerve emerged from the brainstem as a single trunk, entered the subarachnoid space, split into two branches, merged again in the cavernous sinus, and innervated the lateral rectus muscle as a single trunk. In six specimens, conversely, the abducens nerve exited the pontomedullary sulcus as two separate radices but joined in the cavernous sinus to innervate the lateral rectus muscle. In 13 specimens, both branches of the nerve passed beneath the petrosphenoidal ligament. In two specimens, one of the branches passed under the ligament and the other passed over it. In one of these last two specimens, one branch passed over the petrosphenoidal ligament and the other through a bony canal formed by the petrous apex and the superolateral border of the clivus. In all of the specimens, both branches were wrapped by two layers: an inner layer made up of the arachnoid membrane and an outer layer composed of the dura during its course between their dural openings and the lateral wall of the cavernous segment of the internal carotid artery. This finding was also confirmed by histological examination in one specimen. CONCLUSION Double abducens nerve is not a rare variation. Keeping such variations in mind could spare us from injuring the VIth cranial nerve during cranial base operations and transvenous endovascular interventions.

Dorello's canal: a microanatomical study

1991 ◽  
Vol 75 (2) ◽  
pp. 294-298 ◽  
Author(s):  
Felix Umansky ◽  
Josef Elidan ◽  
Alberto Valarezo
Keyword(s):  
Cranial Nerve ◽  
Venous Blood ◽  
Abducens Nerve ◽  
Microsurgical Anatomy ◽  
Sixth Cranial Nerve ◽  
Content Type ◽  
Dorello’S Canal ◽  
Pathological Conditions ◽  
Anatomical Relationship ◽  
Fine Print

✓ The microsurgical anatomy of Dorello's canal has been studied in 20 specimens obtained from 10 cadaver heads fixed in formalin. The bow-shaped canal through which courses the abducens nerve before reaching the cavernous sinus is located inside a venous confluence which occupies the space between the dural leaves of the petroclival area. The petrosphenoidal ligament (Gruber's ligament), which forms the posteromedial wall of the canal, appears as a fibrous trabecula surrounded by venous blood. Canal measurements were performed and its anatomical relationship with the sixth cranial nerve is described. Angulations of variable degrees were observed in the course of the nerve inside and outside the canal. The influence of this relatively tortuous course of the abducens nerve upon its vulnerability in some pathological conditions is discussed.

The Lateral Rectus Muscle and Sixth Cranial Nerve in the Pig

Nature ◽  
1956 ◽  
Vol 178 (4537) ◽  
pp. 798-799 ◽  
Author(s):  
M. E. LAW ◽  
M. J. T. FITZGERALD
Keyword(s):  
Cranial Nerve ◽  
Rectus Muscle ◽  
Lateral Rectus ◽  
Sixth Cranial Nerve ◽  
Lateral Rectus Muscle

Transsphenoidal approach to infrasellar tumors involving the cavernous sinus

1990 ◽  
Vol 73 (4) ◽  
pp. 513-517 ◽  
Author(s):  
Nobuo Hashimoto ◽  
Haruhiko Kikuchi
Keyword(s):  
Cavernous Sinus ◽  
Cranial Nerve ◽  
Cranial Nerves ◽  
Transsphenoidal Approach ◽  
Skull Base Tumors ◽  
Content Type ◽  
Operating Field ◽  
Cranial Nerve Palsies ◽  
Operative Complications ◽  
Fine Print

✓ The authors review their 2-year experience with a rhinoseptal transsphenoidal approach to skull-base tumors of various pathologies involving both the sphenoid and cavernous sinuses. Eight patients with cranial nerve palsies attributable to compression of the contents of the cavernous sinus and/or optic canal are included in this report. Among these patients, a total of 17 cranial nerves were affected. Postoperative normalization was achieved in eight nerves, significant improvement in seven nerves, and no improvement in two nerves. There were no operative complications of aggravation of cranial nerve palsies in this series. In spite of the limited operating field, the results demonstrate the effectiveness and safety of this approach. The authors recommend that this approach be considered before more aggressive surgery is undertaken.

A combined orbitozygomatic infratemporal epidural and subdural approach for lesions involving the entire cavernous sinus

1989 ◽  
Vol 71 (5) ◽  
pp. 699-704 ◽  
Author(s):  
Akira Hakuba ◽  
Kiyoaki Tanaka ◽  
Toshihisa Suzuki ◽  
Shuro Nishimura
Keyword(s):  
Carotid Artery ◽  
Cavernous Sinus ◽  
The Other ◽  
Vascular Lesions ◽  
Content Type ◽  
Fine Print

✓ The authors present four cases of vascular lesions and 10 cases of tumors involving the cavernous sinus. They were operated on via a combined orbitozygomatic infratemporal epidural and subdural approach. With this approach, multisided exposure of the cavernous sinus can be achieved via the shortest possible distance with minimal retraction of the neural structures in and around the cavernous sinus. In one patient the carotid artery had been occluded previously, but in the other 13 patients it was preserved. There was no mortality, and all patients except one returned to work within 6 months after surgery.

Sixth nerve schwannomas

1991 ◽  
Vol 75 (4) ◽  
pp. 638-641 ◽  
Author(s):  
Howard Tung ◽  
Thomas Chen ◽  
Martin H. Weiss
Keyword(s):  
Cavernous Sinus ◽  
Cranial Nerve ◽  
Nerve Palsy ◽  
Obstructive Hydrocephalus ◽  
Surgical Excision ◽  
Type I ◽  
Sixth Cranial Nerve ◽  
Content Type ◽  
Sixth Nerve Palsy ◽  
Sixth Nerve

✓ Two cases of sixth cranial nerve schwannoma are presented with a review of four other cases from the literature. The clinical spectrum, neuroradiological findings, and surgical outcome of the six cases are discussed. There are two distinct clinical presentations for sixth cranial nerve schwannomas. Type I sixth nerve schwannomas present with sixth nerve palsy and diplopia and arise from the cavernous sinus. In contrast, type II sixth nerve schwannomas have a more severe presentation with obstructive hydrocephalus, raised intracranial pressure, sixth nerve palsy, and diplopia. This type arises along the course of the sixth cranial nerve in the prepontine area. Cavernous sinus involvement in either type may preclude total surgical excision and indicate an increased possibility for recurrence.

The Abducens Nerve: Microanatomic and Endoscopic Study

2007 ◽  
Vol 61 (suppl_3) ◽  
pp. ONS-7-ONS-14 ◽  
Author(s):  
Giorgio Iaconetta ◽  
Mario Fusco ◽  
Luigi M. Cavallo ◽  
Paolo Cappabianca ◽  
Madjid Samii ◽  
...  
Keyword(s):  
Cranial Nerve ◽  
Rectus Muscle ◽  
Abducens Nerve ◽  
Nerve Injuries ◽  
Endoscopic Endonasal ◽  
Lateral Rectus Muscle ◽  
Endoscopic Study ◽  
Anatomic Dissection ◽  
Neurovascular Structures

Abstract Objective: Only a few anatomic studies concerning the intra- or extracranial course of the abducens nerve (Cranial Nerve VI) have been reported. This is likely because the nerve passes through anatomically intricate areas, making its neurovascular relationships complex. Here we provide an anatomically and surgically oriented classification of the abducens nerve, analyze the microanatomy of the nerve and the surrounding connective and/or neurovascular structures, and provide measurements and anatomic topography. Patients and Methods: A microsurgical anatomic dissection of 55 cadaveric human heads was performed using different skull base approaches to explore the entire course of the VIth cranial nerve, from its origin at the pontomedullary sulcus to the lateral rectus muscle. We then approached the same areas via an endoscopic endonasal transsphenoidal route, analyzed the neurovascular relationships from an anteromedial perspective, and made comparisons with the microsurgical views. Results: The abducens nerve is divided into five segments, of which three are intracranial (cisternal, gulfar, and cavernous) and two are orbital (fissural and intraconal). Using two opposing surgical routes (microsurgical transcranial and endoscopic endonasal approaches) allows us to clearly reveal the spatial relationships of the abducens nerve with other neurovascular structures on the different nerve segments. Conclusion: The classification of five segments for the abducens nerve seems anatomically valid and is surgically oriented with respect to both the microscopic and endonasal endoscopic approaches. It would be useful to explain, segment by segment, the pathogenic mechanism(s) for nerve injuries that are evidenced by lesions that exist along the entire intra- and extracranial course.

Tumors of the lateral wall of the cavernous sinus

1992 ◽  
Vol 77 (4) ◽  
pp. 508-514 ◽  
Author(s):  
Magdy El-Kalliny ◽  
Harry van Loveren ◽  
Jeffrey T. Keller ◽  
John M. Tew
Keyword(s):  
Cavernous Sinus ◽  
Cranial Nerve ◽  
Tumor Resection ◽  
Lateral Wall ◽  
Content Type ◽  
Nerve Preservation ◽  
Membranous Layer ◽  
Microsurgical Approach ◽  
Dural Wall ◽  
Fine Print

✓ The lateral dural wall of the cavernous sinus is composed of two layers, the outer dural layer (dura propria) and the inner membranous layer. Tumors arising from the contents of the lateral dural wall are located between these two layers and are classified as interdural. They are in essence extradural/extracavernous. The inner membranous layer separates these tumors from the venous channels of the cavernous sinus. Preoperative recognition of tumors in this location is critical for selecting an appropriate microsurgical approach. Characteristics displayed by magnetic resonance imaging show an oval-shaped, smooth-bordered mass with medial displacement but not encasement of the cavernous internal carotid artery. Tumors in this location can be resected safely without entering the cavernous sinus proper by using techniques that permit reflection of the dura propria of the lateral wall (methods of Hakuba or Dolenc). During the last 5 years, the authors have identified and treated five patients with interdural cavernous sinus tumors, which included two trigeminal neurinomas arising from the first division of the fifth cranial nerve, two epidermoid tumors, and one malignant melanoma presumed to be primary. The pathoanatomical features that make this group of tumors unique are discussed, as well as the clinical and radiological findings, and selection of the microsurgical approach. A more favorable prognosis for tumor resection and cranial nerve preservation is predicted for interdural tumors when compared with other cavernous sinus tumors.

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