scholarly journals Anatomical variations and dimensions of arteries in the anterior part of the circle of Willis

2019 ◽  
Vol 78 (2) ◽  
pp. 259-266 ◽  
Author(s):  
J. Shatri ◽  
S. Cerkezi ◽  
V. Ademi ◽  
V. Reci ◽  
S. Bexheti
Keyword(s):  
Anterior Part ◽  
Anatomical Variations ◽  
Circle Of Willis

scholarly journals Anatomical variations of circle of Willis - a cadaveric study

2017 ◽  
Vol 4 (4) ◽  
pp. 1249 ◽  
Author(s):  
Ramanuj Singh ◽  
Ajay Babu Kannabathula ◽  
Himadri Sunam ◽  
Debajani Deka
Keyword(s):  
Cerebral Artery ◽  
Anterior Cerebral Artery ◽  
Anterior Part ◽  
Cerebral Arteries ◽  
Anatomical Variations ◽  
Circle Of Willis ◽  
Anterior Communicating Artery ◽  
Surgical Interventions ◽  
Collateral Channel ◽  
The Right

Background: The circle of Willis (CW) is a vascular network formed at the base of skull in the interpeduncular fossa. Its anterior part is formed by the anterior cerebral artery, from either side. Anterior communicating artery connects the right and left anterior cerebral arteries. Posteriorly, the basilar artery divides into right and left posterior cerebral arteries and each join to ipsilateral internal carotid artery through a posterior communicating artery. Anterior communicating artery and posterior communicating arteries are important component of circle of Willis, acts as collateral channel to stabilize blood flow. In the present study, anatomical variations in the circle of Willis were noted.Methods: 75 apparently normal formalin fixed brain specimens were collected from human cadavers. 55 Normal anatomical pattern and 20 variations of circle of Willis were studied. The Circles of Willis arteries were then colored, photographed, numbered and the abnormalities, if any, were noted.Results: Twenty variations were noted. The most common variation observed is in the anterior communicating artery followed by some other variations like the Posterior communicating arteries, Anterior cerebral artery and posterior cerebral artery (PCA) was found in 20 specimens.Conclusions: Knowledge on of variations in the formation of Circle of Willis, all surgical interventions should be preceded by angiography. Awareness of these anatomical variations is important in the neurovascular procedures.

scholarly journals Recurrent artery of Heubner - morphological variations

2013 ◽  
Vol 19 (3) ◽  
pp. 141-146 ◽  
Author(s):  
Cr.P. Dimitriu ◽  
D.M. Iliescu ◽  
P. Bordei ◽  
I. Bulbuc
Keyword(s):  
Anterior Part ◽  
Anatomical Variation ◽  
Vascular Anatomy ◽  
Internal Capsule ◽  
Anatomical Variations ◽  
Neurological Complications ◽  
Circle Of Willis ◽  
Anterior Communicating Artery ◽  
Neurosurgical Procedures ◽  
Anterior Portion

Abstract Recurrent artery of Heubner (RAH) is the largest and most constant perforating branch of anterior cerebral artery. It supplies blood to the medial portion of the orbitofrontal cortex, the anterior portion of the caudate nucleus, the anterior third of the putamen, the external segment of the globus pallidus, and the anterior crus of the internal capsule The anatomical variation of RAH is related to its traject, number, presence, or absence, and the diverse origin from ACA is of considerable clinical impact mainly from the point of view of the surgical procedures involving the anterior portion of the circle of Willis or the topographically related structures. The present study aimed to demonstrate vascular anatomy of this RAH and its variation. The study included 60 human cadaveric brains fixed in the formalin and examined under operating microscope. 22 freshly harvested human cadaveric brains, injected with a polymer (Technovit 7143), a partial coroded and also we have consulted 30 digital subtraction angiograms. We have evaluated the origin, traject and caliber of recurrent artery of Heubner, our results were compared with other anatomical studies published. The most obvious finding was the great variability of its origin but in 91% of the cases it was in the range of 2mm around anterior communicating artery, that could be harmed during aneurismal clipping. The RAH is commonly arising from ACA-ACoA junction. This portion of the circle of Willis is the place of many anatomical variations and malformations. The vessel can be absent, single, or multiple, and its diameter is highly variable. The awareness of these distinct anatomical and morphometric variations of the RAH is essential in planning the neurosurgical procedures in the anterior part of the circle of Willis to avoid the unexpected neurological complications.

Carotid endarterectomy in patients with foetal-type posterior circle of Willis: Is there an indication for local anaesthesia?

VASA ◽  
2011 ◽  
Vol 40 (5) ◽  
pp. 404-407
Author(s):  
Maras ◽  
Tzormpatzoglou ◽  
Papas ◽  
Papanas ◽  
Kotsikoris ◽  
...  
Keyword(s):  
Carotid Endarterectomy ◽  
Local Anaesthesia ◽  
Anatomical Variation ◽  
Anatomical Variations ◽  
Circle Of Willis ◽  
Variable Degree ◽  
Operative Complications ◽  
The Right ◽  
Ica Stenosis ◽  
Symptomatic Stenosis

Foetal-type posterior circle of Willis is a common anatomical variation with a variable degree of vessel asymmetry. In patients with this abnormality, carotid endarterectomy (CEA) may create cerebral hypo-perfusion intraoperatively, and this may be underestimated under general anaesthesia. There is currently no evidence that anatomical variations in the circle of Willis represent an independent risk factor for stroke. Moreover, there is a paucity of data on treating patients with such anatomical variations and co-existing ICA stenosis. We present a case of CEA under local anaesthesia (LA) in a 52-year-old female patient with symptomatic stenosis of the right ICA and coexistent foetal-type posterior circle of Willis. There were no post-operative complications and she was discharged free from symptoms. She was seen again 3 months later and was free from complications. This case higlights that LA should be strongly considered to enable better intra-operative neurological monitoring in the event of foetal-type posterior circle of Willis.

Exposure of the anterior part of the circle of Willis in the dog

1974 ◽  
Vol 41 (1) ◽  
pp. 107-112
Author(s):  
Shigeaki Hori ◽  
Williamina A. Himwich
Keyword(s):  
Anterior Part ◽  
Cerebral Arteries ◽  
Circle Of Willis ◽  
Content Type ◽  
Anatomical Characteristics ◽  
Fine Print

✓ A technique for exposing the vessels in the anterior part of the circle of Willis in the dog is described. Some of the physiological and anatomical characteristics of the anterior communicating and the anterior cerebral arteries are discussed.

scholarly journals STUDY ON THE ANATOMICAL VARIATIONS OF THE ANTERIOR PART OF THE CIRCLE OF WILLI’S IN ADULT HUMAN CADAVERS

2017 ◽  
Vol 5 (3.1) ◽  
pp. 4073-4077 ◽  
Author(s):  
Janardhan Rao M ◽  
◽  
Devadas P ◽  
Yesender M ◽  
Shiny Vinila B H ◽  
...  
Keyword(s):  
Anterior Part ◽  
Anatomical Variations ◽  
Adult Human ◽  
Human Cadavers

Configuration of Circle of Willis and Its Clinical Significance

2018 ◽  
Vol 08 (04) ◽  
pp. 270-273
Author(s):  
Aisha Hassan Brohi ◽  
Kevin Joseph Jerome Borges ◽  
Gulraiz Hikmat Yar ◽  
Syed Nudrat Nawaid Shah ◽  
Nuzhat Hassan
Keyword(s):  
Clinical Significance ◽  
Anatomical Variations ◽  
Circle Of Willis ◽  
Brain Diseases ◽  
Clinical Implications ◽  
Clinical Effects ◽  
Radiological Procedures

In occlusive vascular brain diseases, the structure of the circle of Willis is of immense importance. A high percentage of variations have been reported in the arteries forming circle of Willis. These have profound clinical implications. With advances in interventional radiological procedures, the interventional radiologists and neurosurgeons need to have thorough knowledge of these variations. This article will help readers understand the significance of anatomical variations and their clinical effects.

scholarly journals Average dimensions of the vessels at the base of the brain and the embryological basis of its variations

2013 ◽  
Vol 02 (04) ◽  
pp. 180-189
Author(s):  
Iqbal S.
Keyword(s):  
Anterior Part ◽  
Cerebral Arteries ◽  
Cerebral Dominance ◽  
Circle Of Willis ◽  
Detailed Knowledge ◽  
Differential Growth ◽  
Ischemic Attack ◽  
The Individual ◽  
The Right ◽  
The Brain

Abstract Background and aims: The cerebral circulation is constantly maintained by the anastomotic circle of Willis which is often anomalous in more than 50% of the normal adult brains. These anomalies increase the risk of the stroke and transient ischemic attack in older patients. Adequate blood flow through the circle of Willis is often necessary to prevent these ischemic infarctions. The anomalies of cerebral vessels are directly related to the differential growth of various parts of the brain. A detailed knowledge of the individual measurements of the cerebral arteries is useful to neurosurgeon in planning the shunt operations and in the choice of their patients. The present study is aimed to analyze the average dimensions of the vessels at the base of brain and an attempt to explain the common form of variations in terms of embryological development. Materials and methods: Fifty adult cadaveric brains were obtained from routine cadaveric dissections. The base of the brain with the circle of Willis was fixed in 10% formalin and preserved. The circle was analyzed for variations in the size, length and number of the component vessels and any asymmetry in the configuration. The dimensions of the vessels forming the circle were measured using graduated calipers. The observations were recorded and tabulated. Results: Asymmetry was observed in 10% to 36% of the circles in this study. Anomalies were more common in the posterior than in the anterior part of the circle. The posterior anomalies included hypoplastic vessels, absent vessels and embryonic derivation while anterior anomalies were predominantly of accessory vessels. Middle cerebral artery exhibited the least variations. In majority of the circles, left sided vessels were larger in diameter than the right. Conclusions: Variations are more common in the posterior than in the anterior part of the circle and on the right than on the left side of the brain. There was no correlation between the variations of circle of Willis of the right side and the left cerebral dominance. There seems to be no difference between races, concerning the anatomic variations of the brain circulation.

The Perforating Arteries of the Anterior Part of the Circle of Willis

1994 ◽  
Vol 7 (4_suppl) ◽  
pp. 79-83 ◽  
Author(s):  
Ph. Mercier ◽  
D. Fournier ◽  
G. Brassier ◽  
P. Cronier ◽  
X. Papon ◽  
...  
Keyword(s):  
Anterior Part ◽  
Circle Of Willis ◽  
Perforating Arteries
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