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Year : 2021  |  Volume : 70  |  Issue : 2  |  Page : 81-84

Omega sign: An indicator of motor hand area on cerebral hemisphere

Department of Anatomy, Bharati Vidyapeeth (DTU) Medical College, Pune, Maharashtra, India

Correspondence Address:
Dr. Shilpa Nandkishor Gosavi
Department of Anatomy, Bharati Vidyapeeth (DTU) Medical College, Pune, Maharashtra
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/JASI.JASI_151_20

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Introduction: With advances in the field of technology microneurosurgery is performed with the use of transcisternal, transfissural, and transsulcul approaches, where sulci present on brain are used as fundamental landmarks. Detailed knowledge of various cerebral sulci and gyri is also essential for neuroimaging techniques. Often neurosurgeons need to work in the central lobe to approach the cortical or subcortical lesions. The aim of the study was to identify and locate omega sign on the precentral gyrus as an indicator of hand area and to provide anatomical basis for the surgical landmark on the cortical surface. Material and Methods: Fifty-five cerebral hemispheres were studied in the Department of Anatomy. On the superolateral surface, the central sulcus, pre- and post-central gyri were identified. On the precentral gyrus, the presence of omega sign was observed. When present the height of the omega sign, width at the base, its distance from superior and inferior Rolandic point was noted. Data collected were statistically analyzed using SPSS version 25.0 software. Results: We observed the presence of omega sign in 26 hemispheres (47.27%). The average height of omega was 9.31 ± 2.94 mm, average width at base was 16.03 ± 3.34 mm. Distance from the superior Rolandic point was 27.53 ± 7.05 mm, while from inferior Rolandic point, it was 52.55 ± 7.8 mm. Discussion and Conclusions: Although technology offers modern intraoperative localization tools such as MRI and neuronavigation, anatomical knowledge is important for the surgical planning.

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