A study on variations in the branching pattern of anterior cerebral artery

Sujitha Jacinth, J (2008) A study on variations in the branching pattern of anterior cerebral artery. Masters thesis, Madurai Medical College, Madurai.

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Abstract

The dimensions and branching pattern of the anterior cerebral artery have been studied and the observed result leads to the following conclusions: 1. The anterior cerebral artery took its origin from the corresponding internal carotid artery at the anterior perforated substance and was single in number at its origin. The angulations of the artery towards the anterior communicating artery varied from 50 to 60 degrees in all the specimens. 2. The dimensions corresponding to the external diameter of both the internal carotid artery at its termination and the middle cerebral artery at its origin correlated with the earlier studies. 3. Length and diameter of A1 segment was within the normal limit so that no hypoplastic changes were seen. The perforators arising from this segment were a maximum of 4 in number. 4. The anterior communicating artery was absent in one specimen, doubled in three specimen and a loop like pattern in one specimen. The dimensions of this artery lie within the standard margin. A maximum of three perforators coursed upwards from the posterosuperior surface of this artery. 5. A third anterior cerebral artery was seen to arise from the anterior communicating artery with an incidence of 2%, followed the same course as that of A2 on left side and ended by turning upwards similar to the callosomarginal branch. 6. The recurrent artery of Heubner arose in majority of cases distal to the anterior communicating artery. It has been observed that 80 % of the artery took origin at the A2 segment, 10% at the level of anterior communicating artery and 10% from the A1 segment. 7. Diameter of A2 segment was within normal limit. No hypoplastic or aplastic changes occurred. The three branches constantly seen in the entire specimen are the orbitofrontal, frontopolar and callosomarginal artery. Inter hemispheric branches were also present in four specimens. 8. The majority of the aneurysms of the anterior cerebral artery near the anterior communicating artery pointing anteriorly and inferiorly are safely clippable. The posterior and superiorly pointing aneurysms are fraught with more risks due to the proximity and involvement of anterior communicating artery perforators, recurrent artery of Heubner and A2 segments. Hence the anatomy of the branches arising from the anterior cerebral artery near the anterior communicating artery complex was to be investigated properly to minimize neurovascular morbidity caused by surgical procedures performed in this region. 9. The present study conform the high percentage of variations in the anterior cerebral artery, to more variations in the anterior communicating artery and distal anterior cerebral artery segments rather than A1 segments. The anterior cerebral artery – anterior communicating artery complex is incredibly varied and consequently the surgery in this area is extremely challenging.

Item Type: Thesis (Masters)
Uncontrolled Keywords: variations, branching pattern, anterior cerebral artery.
Subjects: MEDICAL > Anatomy
Depositing User: Subramani R
Date Deposited: 05 Oct 2019 08:09
Last Modified: 05 Oct 2019 08:09
URI: http://repository-tnmgrmu.ac.in/id/eprint/11688

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