Applied Anatomy Study Of Transnasal Endoscopic Optic Canal Decompression

Objective: Meeting the needs of the clinical operation,we seek the fast,safe and easy way of the transnasal endoscopic optic canal decompression through the applied anatomy study on the optic canal, we provided reliable anatomic data and information concerned with the prevention of complications and the diagnosis of the optic canal.Materials and Methods: 30 adult cadaver heads were selected randomized (male 21,female 9). We cut these heads along the line of the middle axial and brain tissues were removed. Accroding to the same position of the transnasal endoscopic optic canal decompression to the optic canal, we measured the distance of the varial anatomic landmark, the angle of the elevation and the lateral deviation,the lateraldeviate distance. To study the anatomicale relationship between the posterior ethmoid sinus, sphenoid sinus and optic canal. At the same time ,some cadavers were scanned via CT(SHIMADZU Japan) with coronal, sagittal and axial plane according to the Frankfurt-Virchow plane. The CT images were treated by the "sharp" techniqure.Comparing these images to the sectional anatomy of the same cadaver heads on the location and survey. The data was treated statistically by the SPSS mircrosoft.Results (1) The distance from anterior nasal spine to orbital opening of optic canal was (62.01+5.51) mm, (68.23 ±5.82)mm to the cranial opening. (2) The average length of optic canal's medial wall was (11.48 ±1.45) mm. (3) The thickness of the medial wall of the middle part in the optic canal was (0.56± 0.46) mm, its caliber is (4.06 + 0.56) mm. One medial wall was defect, about 1.67% ( 1/60) . (4) The angle of elevation from floor of nose to the medial superior wall of orbital opening was 38.77° ±5.71° , 34.08° +4.94° to the cranial opening's. With the depth was increased, the angle was decreased. (5) The angle of lateral deviation from cranial media line to lateral superior wall of orbital...