The branching pattern of the middle cerebral artery: is the intermediate trunk real or not? An anatomical study correlating with simple angiography: Laboratory investigation
Abstract
OBJECT: The branching structure of the middle cerebral artery (MCA) remains a debated issue. In this study the authors aimed to describe this branching structure in detail. METHODS: Twenty-seven fresh, human brains (54 hemispheres) obtained from routine autopsies were used. The cerebral arteries were first filled with colored latex and contrast agent, followed by fixation with formaldehyde. All dissections were done under a microscope. During examination, the trunk structures of the MCA and their relations with cortical branches were demonstrated. Lateral radiographs of the same hemispheres were then obtained and comparisons were made. Angles between the MCA trunks were measured on 3D CT cerebral angiography images in 25 patients (50 hemispheres), and their correlations with the angles obtained in the cadaver brains were evaluated. RESULTS: A new classification was made in relation to the terminology of the intermediate trunk, which is still a subject of debate. The intermediate trunk was present in 61% of cadavers and originated from a superior trunk in 55% and from an inferior trunk in 45%. Cortical branches supplying the motor cortex (precentral, central, and postcentral arteries) significantly originated from the intermediate trunk, and the diameter of the intermediate trunk significantly increased when it originated from the superior trunk. In measurements of the angles between the superior and intermediate trunks, it was found that the intermediate trunk had significant dominance in supplying the motor cortex as the angle increased. The intermediate trunk was classified into 3 types based on the angle values and the distance to the bifurcation point as Group A (pseudotrifurcation type), Group B (proximal type), and Group C (distal type). Group A trunks were seemingly closer to the trifurcation structure that has been reported on in the literature and was seen in 15%. Group B trunks were the most common type (55%), and Group C trunks were characterized as the farthest from the bifurcation point. Group C trunks also had the smallest diameter and fewest cortical branches. Similarities were found between the angles in cadaver specimens and on 3D CT cerebral angiography images. Beyond the separation point of the MCA, trunk structures always included the superior trunk and inferior trunk, and sometimes the intermediate trunk. CONCLUSIONS: Interrelations of these vascular structures and their influences on the cortical branches originating from them are clinically important. The information presented in this study will ensure reliable diagnostic approaches and safer surgical interventions, particularly with MCA selective angiography.
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- Authors
- Kahilogullari, G., Ugur, H. C., Comert, A., Tekdemir, I., & Kanpolat, Y.
- Affiliations
- Departments of Neurosurgery and
- Anatomy, Ankara University, Faculty of Medicine, Ankara, Turkey
- Venue
- Journal of neurosurgery
- Published
- 2012-05
- Volume
- 116
- Issue
- 5
- Pages
- 1024-1034
- ISSN
- 0022-3085 (ISSN-L)
- 1933-0693
- OpenAlex
- W1581062830
- Cited by
- 35
- References
- 36
- Citations by year
- 2026: 2 · 2025: 3 · 2023: 6 · 2021: 3 · 2020: 2 · 2019: 3 · 2018: 2 · 2017: 3 · 2016: 5 · 2015: 2 · 2014: 3 · 2013: 1
- FWCI
- 1.54
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of neurosurgery (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Cerebrovascular and Carotid Artery Diseases
- Health Sciences › Medicine › Neurology › Intracranial Aneurysms: Treatment and Complications
- Health Sciences › Medicine › Anatomy › Medical and Biological Sciences
- Keywords
- middle cerebral artery, arterial branching pattern, central arteries, cerebral angiography, cadaveric dissection, surgical safety, bifurcation points
- MeSH terms
- Cadaver, Cerebral Angiography, Cerebral Arteries, Cerebral Cortex, Cerebrovascular Circulation, Humans, Image Processing, Computer-Assisted, Temporal Arteries, Tomography, X-Ray Computed, Middle Cerebral Artery
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