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Anatomical Variations of the Temporomesial Structures in Normal Adult Brain - A Cadaveric Study
Suresh Kumar Parmar1, Nupur Pruthi2, Roopa Ravindranath1
1Department of Anatomy, St. John's Medical College, Bengaluru, Karnataka, India.
This study details anatomical variations in human temporal lobe structures, revealing significant left-greater-than-right asymmetry in well-defined regions. These findings enhance understanding of temporomesial anatomy for neurosurgical approaches.
Area of Science:
- Neuroanatomy
- Human Anatomy
- Surgical Anatomy
Background:
- Limited research exists on anatomical variations of temporomesial structures in cadaveric samples.
- This study focuses on documenting variations within the human temporal lobe, specifically the temporomesial region.
Purpose of the Study:
- To document anatomical variations of human temporomesial structures.
- To analyze surface-based qualitative variations and asymmetries in the temporal lobe.
Main Methods:
- Dissection of 26 postmortem human cerebral hemispheres (13 right, 13 left) under an operating microscope.
- Study of neurosurgically significant mesial structures using blunt dissection.
- Classification of variations and asymmetries into well-defined, moderately defined, and ill-defined categories.
Main Results:
- Uncus (100%), limen insulae (88.4%), hippocampus (81%), and Heschl's gyrus (73%) were frequently well-defined.
- Band of Giacomini (38.4%) was consistently ill-defined.
- Consistent left-greater-than-right asymmetry was observed in well-defined temporal lobe areas; rightward asymmetry in moderately and ill-defined areas; no asymmetry in the uncus.
Conclusions:
- Provides a foundational understanding of temporal lobe anatomical variations.
- Highlights potential value for neurosurgeons in planning temporomesial lesion surgeries.
- Emphasizes the importance of detailed anatomical knowledge for surgical precision.
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