The optic chiasm

Kidd, Desmond P.

doi:10.1002/ca.22385

Cited by 27 publications

(35 citation statements)

References 52 publications

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“…Few articles have reported the pial blood supply to the optic chiasm (OC) (Blunt and Steele, ; Collette et al, ; Rhoton, ; Kidd, ), and only three have reported the intrinsic arterial network of the OC; but their results are discordant (Blunt and Steele, ; Collette et al, ; Bergland, ).…”

Section: Introductionmentioning

confidence: 99%

“…For Collette et al () and in the review of the literature by Kidd (), this pial network arises from all arteries in the circle of Willis. According to some authors, only a few arteries arising from the circle of Willis are involved in the OC blood supply (Blunt and Steele, ; Dawson, ; Bergland, ;Wollschlaeger et al, ; Rhoton, ).…”

Section: Introductionmentioning

confidence: 99%

“… ACA, Anterior cerebral artery; AChA, anterior choroidal artery; ACoA, anterior communicating artery; BA, basilar artery; ICA, internal carotid artery; MCA, middle cerebral artery; OphtA, ophthalmic artery; PCoA, posterior communicating artery; PCA, posterior cerebral artery. (Collette et al, ; Kidd, ; Bergland, ; Blunt and Steele, ; Dawson, ; Rhoton, ; Wollschlaeger et al, . )…”

Section: Introductionmentioning

confidence: 99%

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Extrinsic and intrinsic blood supply to the optic chiasm

et al. 2017

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Although there have been many studies of the arterial cerebral blood supply, only seven have described the optic chiasm (OC) blood supply and their results are contradictory. The aim of this study was to analyze the extrinsic and intrinsic OC blood supply on cadaveric specimens using dissections and microcomputer tomography (Micro-CT). Thirteen human specimens were dissected and the internal or common carotid arteries were injected with red latex, China Ink with gelatin or barium sulfate. Three Micro-CTs were obtained to reveal the intrinsic blood supply to the OC. The superior hypophyseal arteries (SupHypA) (13/13) and posterior communicating artery (PCoA) (12/13) supplied the pial network on the inferior side of the OC. The first segment of the anterior cerebral artery (ACA) (10/10), SupHypA (7/10), the anterior communicating artery (ACoA) (9/10), and PComA (1/10) supplied the pial network of its superior side. The intrinsic OC blood supply was divided into three networks (two lateral and one central). Capillaries entering the OC originated principally from the inferior pial network. The lateral network capillaries had the same orientation as the visual lateral pathways, but the central network was not correlated with the nasal fibers crossing into the OC. There was no anastomosis in the pial or intrinsic networks. Only SupHypA, PCoA, ACoA, and ACA were involved in the OC blood supply. Because there was no extrinsic or intrinsic anastomosis, all arteries should be preserved. Tumor compression of the inferior intrinsic arterial network could contribute to visual defects. Clin. Anat. 31:432-440, 2018. © 2017 Wiley Periodicals, Inc.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extrinsic and intrinsic blood supply to the optic chiasm

et al. 2017

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“…The blood supply to the chiasm is derived from multiple sources including: small branches of the proximal anterior cerebral artery, anterior communicating artery, posterior communicating, posterior cerebral, and basilar arteries. 2 This vascular redundancy is likely a reason why purely ischemic chiasmal syndromes are rare. 3,4 More fibers (53%) cross in the optic chiasm, on their way from the eye to the lateral geniculate nucleus, than remain ipsilateral (47%).…”

Section: Anatomymentioning

confidence: 99%

“…Most people have a normal position of the chiasm (lying over the diaphragma sellae), nearly 15% have a prefixed chiasm (lying more anteriorly), and 5% have a postfixed chiasm (lying more posteriorly). 2 The individual variation in relative position contributes to clinical variation in the presentation of chiasmal syndromes.…”

Section: Anatomymentioning

confidence: 99%

Visual Findings in Chiasmal Syndromes

Foroozan¹

2016

International Ophthalmology Clinics

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The optic chiasm is an important neuroanatomic landmark, in particular as it relates to the pituitary gland and endocrinologic syndromes. Pathology that affects the chiasm helps emphasize key principles of neuroanatomy. The most common visual consequence of pituitary tumors is chiasmal compression, and visual findings remain important indicators of central nervous system pathology in many patients with sellar/suprasellar lesions.In this review, I have illustrated several different clinical syndromes that ensue from pathology involving the optic chiasm and discussed the various etiologies of chiasmal pathology. In addition, I have provided several examples of the neuroimaging findings that highlight the anatomy and pathology involving the optic chiasm.I hoped to provide a logical basis for the practicing ophthalmologist in approaching chiasmal disorders. ' AnatomyThe intracranial optic nerves exit the optic canals and travel at a 30-to 45-degree angle to make up the optic chiasm. The optic chiasm is 12 to 18 mm in diameter and contains the decussation of nasal retinal nerve fibers from each of the optic nerves. 1 Inferior retinal fibers representing the superior visual field cross first, whereas macular fibers cross more posteriorly. The chiasm lies 10 mm above the sella turcica, which contains the pituitary gland (Fig. 1).The space inferior to the chiasm and above the sella is the basal cistern. Anteriorly, the chiasm is exposed to cerebrospinal fluid; posteriorly it abuts the hypothalamus and the anterior portion of the third ventricle. The anatomic position of the chiasm is described as

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Ischemic chiasmal syndrome associated with posterior communicating artery (PCoA) and tuberothalamic artery (TA) infarction: a case report

Ataç

Arı

et al. 2020

Neurol Sci

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The optic chiasm

Cited by 27 publications

References 52 publications

Extrinsic and intrinsic blood supply to the optic chiasm

Extrinsic and intrinsic blood supply to the optic chiasm

Visual Findings in Chiasmal Syndromes

Ischemic chiasmal syndrome associated with posterior communicating artery (PCoA) and tuberothalamic artery (TA) infarction: a case report

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