To clarify the anatomical mark of semilunar ganglion of the trigeminal nerve, improve the CT image interpretation level, and provide the evidence for the target setting of puncture operation by autopsy and CT image.

On the basis of the fresh autopsy of 5 cases with 10 sides in Forensic Department of Jianhu County Public Security Bureau from February to August 2018, the anatomical marks of semilunar ganglion of trigeminal nerve had been confirmed, and the walking path of the divisions and the nerve fibers of the semilunar ganglion and its anterior and posterior roots had been identified. Ten patients with trigeminal neuralgia, admitted to Department of Neurosurgery, Jianhu Hospital Affiliated to Nantong University from February to May 2020, treated by radiofrequency were received thin-layer CT scanning, three-dimensional and multi-azimuth two-dimensional section reconstruction to identify the anatomical markers, and described the anatomical structure of the semilunar ganglion and its anterior and posterior roots.

According to the autopsy, the trigeminal nerve in the semilunar ganglion region was located in Meckel's cavity, whose boundary was defined by the wall of each side cavity. The volume of the ganglion was enlarged, the depression of inferior skull base was deepened, but the dura shape of the superior wall remained unchanged. Based on the autopsy, the boundary lines of the semilunar ganglion of trigeminal nerve were identified with CT images. The lateral boundary of the skull base was the ligature of the external end of the trigeminal nerve impression, the external edge of the semilunar ganglion and the external edge of the oval foramen. The internal boundary of the skull base was the ligature of the internal end of the trigeminal nerve impression, the anterior tubercle and the internal edge of the superior orbital fissure. The inside boundary of the nerve was the internal wall of Meckel cavity. The superior boundary was the upper wall of Meckel cavity. The lower boundary was the skull at the bottom cavity. The boundary of the semilunar ganglion was defined by the shape of the nodal fossa and the cavity wall. According to the location and running of the fibers, the semilunar ganglion could be divided into eye region, maxilla region and mandible region.

On the basis of autopsy, the CT signs of semilunar ganglion and its anterior and posterior roots, boundary, shape and divisions have been identified, which provides evidence for the clinical targets setting and analysis of the relationship between actual lesions and curative effect.

Trigeminal ganglion; Anatomy; Cadaver; Tomography, X-ray computed