Fiber dissection of the visual pathways: Analysis of the relationship of optic radiations to lateral ventricle: A cadaveric study

OBJECTIVEThe authors investigated the specific topographic relationship of the optic radiation fibers to the roof and floor of the ventricular atrium because the current literature is ambiguous.METHODSThirty-five normal, adult, formalin-fixed cerebral hemispheres and 30 focused MRI slices at the level of the atrium were included in the study. The correlative anatomy of the optic radiation with regard to the atrial roof and floor was investigated in 15 specimens, each through focused fiber microdissections. The remaining 5 hemispheres were explored with particular emphasis on the trajectory of the collateral sulcus in relation to the floor of the atrium. In addition, the trajectory of the collateral sulcus was evaluated in 30 MRI scans.RESULTSThe atrial roof was observed to be devoid of optic radiations in all studied hemispheres, whereas the atrial floor was seen to harbor optic fibers on its lateral part. Moreover, the trajectory of the intraparietal sulcus, when followed, was always seen to correspond to the roof of the atrium, thus avoiding the optic pathway, whereas that of the collateral sulcus was found to lead to either the lateral atrial floor or outside the ventricle in 88% of the cases, therefore hitting the visual pathway.CONCLUSIONSOperative corridors accessing the ventricular atrium should be carefully tailored through detailed preoperative planning and effective use of intraoperative navigation to increase patient safety and enhance the surgeon’s maneuverability. The authors strongly emphasize the significance of accurate anatomical knowledge.

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Optic radiations: a microsurgical anatomical study

Journal of Neurosurgery ◽

10.3171/jns.2006.105.2.294 ◽

2006 ◽

Vol 105 (2) ◽

pp. 294-300 ◽

Cited By ~ 49

Author(s):

Johann Peltier ◽

Nadine Travers ◽

Christophe Destrieux ◽

Stéphane Velut

Keyword(s):

Lateral Ventricle ◽

Average Distance ◽

Morphological Characteristics ◽

Anatomical Study ◽

The Body ◽

Surgical Approaches ◽

Optic Radiation ◽

Fiber Dissection ◽

Dissection Technique ◽

Optic Radiations

Object In this study, the authors used a fiber-dissection technique to describe the optic radiation. They focused on the morphological characteristics (length and breadth) of this structure, its course, and its relationships with neighboring fasciculi and the lateral ventricle. Methods The authors dissected 10 previously frozen, formalin-fixed human brains with the aid of an operating microscope by following the fiber dissection technique described by Klingler in 1960. Lateral, inferior, and medial approaches were made. The optic radiation, also known as the Gratiolet radiation, extended from the lateral geniculate body to the calcarine fissure. The average distance from the tip of the anterior Meyer loop to the calcarine sulcus was 105 mm (range 95–114 mm). The breadth of the optic radiations, one on each side of the brain, averaged 17 mm at the level of the inferior horn (range 15–18 mm). This tract could be divided into three main segments: the anterior or Meyer loop, the body, and the end of the optic radiation. Adjacent anatomical structures included: laterally, the inferior longitudinal fasciculi; medially, the tapetum of the corpus callosum; and the ependyma of the inferior horn of the lateral ventricle. Conclusions Various practical surgical approaches are discussed. The knowledge gained by studying this particular anatomy will help prevent injury to the optic radiations during neurosurgery.

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The white matter tracts of the cerebrum in ventricular surgery and hydrocephalus

Journal of Neurosurgery ◽

10.3171/2016.1.jns152082 ◽

2017 ◽

Vol 126 (3) ◽

pp. 945-971 ◽

Cited By ~ 34

Author(s):

Abuzer Güngör ◽

Serhat Baydin ◽

Erik H. Middlebrooks ◽

Necmettin Tanriover ◽

Cihan Isler ◽

...

Keyword(s):

White Matter ◽

Anterior Commissure ◽

Internal Capsule ◽

Surgical Approaches ◽

White Matter Tracts ◽

Lateral Ventricles ◽

Fiber Dissection ◽

Dissection Technique ◽

Relationship Of ◽

The Relationship

OBJECTIVE The relationship of the white matter tracts to the lateral ventricles is important when planning surgical approaches to the ventricles and in understanding the symptoms of hydrocephalus. The authors' aim was to explore the relationship of the white matter tracts of the cerebrum to the lateral ventricles using fiber dissection technique and MR tractography and to discuss these findings in relation to approaches to ventricular lesions. METHODS Forty adult human formalin-fixed cadaveric hemispheres (20 brains) and 3 whole heads were examined using fiber dissection technique. The dissections were performed from lateral to medial, medial to lateral, superior to inferior, and inferior to superior. MR tractography showing the lateral ventricles aided in the understanding of the 3D relationships of the white matter tracts with the lateral ventricles. RESULTS The relationship between the lateral ventricles and the superior longitudinal I, II, and III, arcuate, vertical occipital, middle longitudinal, inferior longitudinal, inferior frontooccipital, uncinate, sledge runner, and lingular amygdaloidal fasciculi; and the anterior commissure fibers, optic radiations, internal capsule, corona radiata, thalamic radiations, cingulum, corpus callosum, fornix, caudate nucleus, thalamus, stria terminalis, and stria medullaris thalami were defined anatomically and radiologically. These fibers and structures have a consistent relationship to the lateral ventricles. CONCLUSIONS Knowledge of the relationship of the white matter tracts of the cerebrum to the lateral ventricles should aid in planning more accurate surgery for lesions within the lateral ventricles.

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Anatomic Relationship of the Optic Radiations to the Atrium of the Lateral Ventricle: Description of a Novel Entry Point to the Trigone

Operative Neurosurgery ◽

10.1227/01.neu.0000313121.58694.4a ◽

2008 ◽

Vol 63 (suppl_4) ◽

pp. ONS195-ONS203 ◽

Cited By ~ 14

Author(s):

Kelly B. Mahaney ◽

Saleem I. Abdulrauf

Keyword(s):

Lateral Ventricle ◽

Lateral Wall ◽

Freezing And Thawing ◽

Point Of Entry ◽

Lingual Gyrus ◽

Temporal Horn ◽

Meyer’S Loop ◽

Relationship Of ◽

Optic Radiations ◽

Anatomic Relationship

Abstract Objective: The aim of this study was to delineate the anatomic relationship of the optic radiations to the atrium of the lateral ventricle using the Klingler method of white matter fiber dissection. These findings were applied to define a surgical approach to the trigone that avoids injury to the optic radiations. Methods: Sixteen cadaveric hemispheres were prepared by several cycles of freezing and thawing. With the use of wooden spatulas, the specimens were dissected in a stepwise fashion. Each hemisphere was dissected first from a lateromedial direction and then from a mediolateral approach, and careful attention was given to the course and direction of the optic radiation fibers at all points from Meyer’s loop to their termination at the cuneus and the lingual gyrus. Results: In all 16 dissected hemispheres, the following observations were made: 1) the entire lateral wall of the lateral ventricle—from the temporal horn to the trigone to the occipital horn—is covered by the optic radiations; and 2) the medial wall of the lateral ventricle in the area of the trigone is entirely free of the optic radiations. Conclusion: The results of this study confirm that the medial parieto-occipital interhemispheric approach to the ventricular trigone will avoid injury to the optic radiations and the calcarine cortex. The authors describe the most direct trajectory to the ventricular trigone using this approach and propose a point of entry that transects the cingulate gyrus at a point 5 mm superior and 5 mm posterior to the falcotentorial junction.

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Microsurgical Anatomy and Operative Approaches to the Lateral Ventricles

Neurosurgery ◽

10.1227/00006123-198611000-00001 ◽

1986 ◽

Vol 19 (5) ◽

pp. 685-723 ◽

Cited By ~ 59

Author(s):

Timurkaynak Erdener ◽

L. Rhoton Albert ◽

Barry Margaret

Keyword(s):

Lateral Ventricle ◽

Third Ventricle ◽

Cerebral Hemispheres ◽

Microsurgical Anatomy ◽

The Third ◽

Lateral Ventricles ◽

Relationship Of ◽

The Relationship ◽

Basal Cisterns

Abstract The anatomy needed to plan microoperative approaches to the lateral ventricles was examined in 20 cadaveric cerebral hemispheres. The neural, arterial, and venous structures in the walls of the lateral ventricles and the relationship of the lateral ventricles to the third ventricle and basal cisterns were examined. The operative approaches to the lateral ventricle are reviewed.

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Acinar choroid plexus adenoma

Journal of Neurosurgery ◽

10.3171/jns.1970.33.5.0587 ◽

1970 ◽

Vol 33 (5) ◽

pp. 587-590 ◽

Cited By ~ 21

Author(s):

Richard L. Davis ◽

Gerald E. Fox

Keyword(s):

Choroid Plexus ◽

Lateral Ventricle ◽

Content Type ◽

Cystic Tumors ◽

Complications Of Surgery ◽

The Right ◽

Relationship Of ◽

The Relationship ◽

Symptoms And Signs ◽

Fine Print

✓ Mucin-producing cystic tumors of the choroid plexus are rare and most are papillomas or carcinomas. An acinar choroid plexus adenoma of the right lateral ventricle is described. Symptoms and signs included headache, vomiting, papilledema, and a gait disturbance. The neoplasm was located with ventriculography and totally removed, but the patient died of complications of surgery. The relationship of this tumor to others arising in the choroid plexus is discussed.

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The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽

10.1017/s0094837300025707 ◽

1980 ◽

Vol 6 (02) ◽

pp. 146-160 ◽

Cited By ~ 29

Author(s):

William A. Oliver

Keyword(s):

Critical Points ◽

Scleractinian Corals ◽

Convincing Evidence ◽

Early Triassic ◽

Rugose Corals ◽

History Of ◽

The Subject ◽

Relationship Of ◽

The Relationship ◽

Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

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