Introduction: Optic Canal is situated in between the two roots of lesser wings of sphenoid, lateral to body of sphenoid. It is traversed by the optic nerve and ophthalmic artery, the nerve being medial to the artery. The study of optic canal has enormous clinical signicance as the optic nerve "The Nerve of Vision" travels through it. The present study was undertaken with the aim to determine the length of optic canal in dry human skulls of Rajasthan State. T Materials and Methods: he present study was conducted using 400 dried human skulls and lengths of the optic canal were measured along the medial wall. The length of optic canal at right side was 7.12 ± Results: 1.29 mm and at left side was 6.99 ± 1.27mm. Detailed anatomy of the optic ca Conclusion: nal is important to decipher the various pathologies of the region as well to guide surgical procedures and therapeutic options.

Introduction: Duplication of optic canal is very rare anomaly which has been seen in both sexes, at various ages and in a number of races. Duplications may be unilateral or bilateral out of which the bilateral duplications is a very rare phenomenon. The present study was undertaken with the aim to determine the incidence of accessory optic canal in dry human skulls of Rajasthan State. The present Materials and Methods: study was conducted using 400 dried human skulls which were thoroughly examined for the presence of unilateral or bilateral accessory optic canals. It was found that out of 400 skulls studied, the incidences of Accessory Results: Optic Canal (AOC) were present in 14 (3.5%) skulls. The AOCs were present unilaterally on the right side in 6 (1.5%), unilaterally on the left side in 5 (1.25%) and bilaterally in 3 (0.75%) skulls. Conclusion: The clinical awareness of duplication of optic canal increases the success rate of surgical procedure of optic canal like decompression, tumour excision, approaching sella turcica, cavernous sinus approach, pneumatization procedures.