Welcome to International Journal of Anatomy and Research

Type of Article : Original Research

Year: 2015 | Volume 3 | Issue 2 | Page No. 1143-1148

Date of Publication: 30-06-2015

DOI: http://dx.doi.org/10.16965/ijar.2015.180

INTERHEMISPHERIC VARIATION OF SYLVIAN FISSURE: A CADAVERIC BRAIN STUDY

Sudakshina Chakrabarti * ¹, S. Vijayalakshmi ².

^*1Assistant Professor, ² Professor. Department of Anatomy,
Saveetha Medical College & Hospital, Chennai, Tamil Nadu, India.

Address: Dr. Sudakshina Chakrabarti, Assistant Professor, Department of Anatomy, Chennai, Tamil Nadu 600072, India.
E-Mail: sudhianat@gmail.com

Abstract

Introduction: Language areas of brain show a beautiful anatomico-functional correlation. It has been often assumed that the interhemispheric asymmetry of Sylvian fissure and perisylvian cortex is the basis of hemispheric dominance for language.The lateral sulcus is one of the earliest-developing sulci of the human brain.
Materials And Methods: 60 formalin fixed cadaveric brains irrespective of sexes were studied in the department of Anatomy. The total length of sylvian fissure on the superolateral surface till the posterior sylvian point was noted bilaterally. Among the other measurements taken were the lengths of anterior ascending, anterior horizontal and posterior limb of lateral sulcus till posterior sylvian point on the right and left cerebral hemispheres.
Observation and Results: The mean of the total length of the lateral sulcus on the left side is 8.48  which is larger than the right  side which  is 8.39.The mean of the anterior horizontal rami on right side (1.97) is greater than left side (1.96). On the other hand the mean value of left anterior ascending ramus 2.41 is greater than the mean value of right anterior ascending ramus 2.37. The mean value of posterior limb of sylvian sulcus is also greater on the left side i.e. 6.43 than on the right side i.e.6.23.All measurements are in cms.
Conclusion: The Sylvian fissure in this study is longer on the left side than the right which has been proved in previous studies.To correlate this structural asymmetry with the functional localization of speech and language calls for further studies.
KEY WORDS: Sylvian fissure, lateral sulcus, anterior Sylvian point, posterior Sylvian point.

References

1. Crow, T. J. Assimetria cerebral e lateralizacao da linguagem deficits nucleares na esquizofrenia como indicadores de predisposicao genetica. Psiquiatria RS. 2004;26(2);122-34.
2. Witelson SF,Kigar DL.Sylvian fissure morphology and asymmetry in men and women :bilateral differences in relation to handedness in men.J Comp Neurol 1992 Sep 15;323(13):326-40.
3. Keller SS, Highley JR., GarciaFinana M, Sluming V, Rezaie R. & Roberts N. Sulcal variability, stereological measurement and asymmetry of Broca's area on MR images. Journal of Anatomy. 2007; 21(4):534-555.
4. Cunningham D. Contribution to the surface anatomy of the cerebral hemisphere, Dublin : Royal Irish Academy, 1892.
5. Yeni-Komshian GH and Benson DA. Anatomical study of cerebral asymmetry in the temporal lobe of humans, chimpanzees, and rhesus monkeys.Science. 1976;192:987-389.
6. Le May M. Morphological cerebral asymmetries of modern man. fossil man and nonhuman primate. Ann N.Y. Acad. Sci. 1976;280:349-366.
7. Witelson SF and Pallie W. Left hemisphere specialization for language in the newborn. Neuro anatomical evidence of asymmetry Brain. 1973;96:641-646.
8. Eberstaller O, Das Stimhim. Ein Beitrag zur Anatomie der oberflache des Gehirns. Urban & Schwarzenberg, Vienna, Austria, 1890.
9. Hopkins WD, Pitcher DL, Mc Gregor L. Sylvian fissure asymmetries in non human primates revisited : A comparative MRI study. Brain Behav. Evol. 2000;56:293-297.
10. Connelly CJ. External morphology of the primate brain. Thomas Spring field III, 1959; P 144.
11. Olufemi Emmanuel Idowu,Sunday Soyemi and Kazeem Atobatele. Morphometry, asymmetry and variations of the sylvian fissure and sulci bordering and within the pars triangularis and pars opercularis An autopsy study.J Clin Diagn Res 2014;8:11.
12. Boni, R. C.; Prodoscimi, F. C.; Bonsi, A. B.; Almeida, T. M. & Ribeiro, L A M.Asymmetries of the left and right temporal lobes. Int. J. Morphol.2007;25(1):117-120,
13. Foundas A L,Faulhaber JR,KulynychJJ,Browning CA,Weinberger DR.Hemispheric and sex linked  differences in Sylvian fissure morphology: a quantitative approach using volumetric magnetic resonance imaging.Neuropsychiatry Neuropsychol Behav Neurol 1999 Jan;12(1):1-10.
14. Ono M, Kubik S, Abernathy CD. Atlas of the cerebral sulci. New York: Georg Thieme Verlag.1990; 62-74.
15. Ayberk G, Yagli OE, Comert A, Esmer AF, Canturk N, Tekdemir I, et al. Anatomicrelationship between the anterior sylvian point and the parsTriangularis. Clin.Anat. 2012;25:429–36.

Sudakshina Chakrabarti, S. Vijayalakshmi. INTERHEMISPHERIC VARIATION OF SYLVIAN FISSURE: A CADAVERIC BRAIN STUDY. Int J Anat Res 2015;3(2):1143-1148. DOI: 10.16965/ijar.2015.180