AAS ›› 2013, Vol. 44 ›› Issue (5 ): 670-674.doi: 10.3969/j.issn.0529-1356.2013.05.017

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Three-dimensional sectional imaging anatomy of the optic chiasma

XU Xiang-dang 1,3 REN Chuan-gen1 LI Jian-ce2 QIAO Hui-huang1 YANG Xin-dong1 CHEN Zhong-xiao1 CHEN Cheng-chun 1* FU Sheng-qi 3*   

  1. 1. Department of Anatomy of Wenzhou Medical College, Zhejiang Wenzhou 325035,China;2. Department of MRI, the First Hospital Affiliated to Wenzhou Medical College,Zhejiang Wenzhou 325003,China;3. Department of Anatomy of Xinxiang Medical University,He’nan  Xinxiang 453003,China)
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  • Received:2013-01-25 Revised:2013-06-13 Online:2013-10-06 Published:2013-10-06

Abstract:

Objective To study the position,shape,adjacent structures and change rule of the adult optic chiasma, and to obtain its three-dimensional data of distance and angle from the serial thin transverse, sagittal, and coronary planes. Methods The three-dimensional data of distance and angles were collected from on 20 sets of serial transverse, sagittal, coronary sections of Chinese adult cadaveric heads and from 40 sets of serial transverse, sagittal, and coronary MRI of normal adult living subjeats. Transverse,superoinferior and anteroposterior diameters of the optic chiasma, anterior, lateral and posterior angles of the optic chiasma were measured. Results On the transverse plane, optic intracranial segment, optic chiasma and initial part of the optic tract were clearly displayed. The chiasma was transversed between the optic and infundibular recesses of the floor of the third ventricle and it located inferio to the A1 segment of the anterior cerebral artery, superior to the tuber cinereum and the pituitary stalk, and lateral to the C2 or C3 segment of the internal carotid artery. The mean transverse diameter in transverse section(TDT) of the optic chiasma was (13.54±3.12)mm , anteroposterior diameter in transverse section(APDT) was (7.91±1.29)mm , superoinferior diameter in coronal section (SIDC) was (3.51±0.49)mm, anterior angle(AA) was (69.7±9.1)°, left lateral angle(LLA) was (121.1±16.9)°, right lateral angle (RLA)was (122.3±15.2)°, and posterior angle(PA) was (73.3±10.2)°.There was no significant difference between the sectional data and MRI data by statistics. Conclusion Examination of the serial thin transverse, sagittal, and coronary planes and MRI is an effective methods to study and identify the spatial relation and the change rules of the optic chiasma.

Key words: Optic chiasma, Optic nerve, Sectional , anatomy, MRI, Adult

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