The stereoscopic orientation of the lumbar zygapophyseal joints and the stability triangle of the motion segments were studied on 56 sets of adult lumbosacral skeletons. The orientation of the lumbar zygapophyseal joints changed gradually from about sagittal plane in upper segment to about coronal in lower. The gravity center of the stability triangle of the motion segments moved backward from upper to ower progressively. Therefore, the stability of lumbar spine decreases and the mobility increases successively from upper downward.

The architecture of the specialized myocardial fibers of the atrioventricular junction area(AVJ) were observed under microscope on serial sections. It was found that the human A-V node extend backward divergently to form two posterior extensions (left and right, LPE, RPE). The A-V node can be divided into a superficial layer and a deep layer, and the deep layer further divided into a upper part and a lower part. The fibers in the superficial layer are vertical, and join with the lower part of the deep layer at the anterior extremity of the node. The lower part of the deep layer is the main axis of the node. The fibers in the lower part of the deep layer are longitudinal, and join with the RPE at the posterior extremity of the node. The fibers in the upper part of the deep layer are oblique and join with the LPE at the posterior extremity of the node, and mix with the lower part at the anterior extremity. The longitudinal dissociation of the anterior part of the His bundle is more distinct than that of the posterior part. The lower-left part of the bifurcating part of the bundle extend to form the posterior left branch, the upper-left and upper-middle parts of the bifurcating part extend to form the anterior left branch, and the right part and lower-middle part of the bifurcating part extend to form the right bundle branch. The morphological evidence of the dual or multiple conducting pathways, the longitudinal dissociation and the reentry pathways in the AVJ were discussed.

Objective To explore the relationship between image quality and different exposure intensity of digital radiography(DR).Methods Using a contrast-detail phantom Cdrad 2.0,observers evaluated images on the monitots when exposure parameters were 90 kV and mAs ranged from 0.5 to 16.0 mAs.Then calculate image quality figure(IQF),and ANOVA was used to analyze the difference of IQF under different radiation dose in 8 subjects.Results (1)When exposure parameters were 90 kV and mAs altered from 0.5 to 8.0 mAs.the IQF observed on the monitor was reduced,and the minimal value was 38.54±2.82.When mAs changing from 8.0 to 16.0 mAs.IQF observed on the monitor was increased,and the maximum was 44.33±2.35.(2)Under the different exposure condition,the difference of IQF values were statistically significant(F=60.35,P＜0.01).Conclusions With the increased exposure intensity,the image quality on monitor increased.When mAs was 8.0 mAs,image quality was the optimum When mAs was more than 8.0 mAs,the image quality on monitor reduced.

In recent years, the cooperation between China and the Republic of Lebanon (hereinafter referred to as "Lebanon" ) in the field of Traditional Chinese Medicine (TCM) service trade has become increasingly urgent. At present, TCM in Lebanon is facing challenges such as the westernized medical environment, the imperfect system of TCM doctors’ recognition, the strict drug access conditions, the imperfect industrial chain of Chinese medical products, and the significant impact of cultural and regional differences on the market demand for Chinese medicine. It is suggested that health care products should be taken as the breakthrough point to develop service trade, enterprises should be attracted to settle in Lebanon from the national level to produce Chinese medicine preparations on the spot, and pay attention to high-level contact, establish TCM hospitals, and deepen cultural exchanges, so as to promote the development of Chinese medicine in the Lebanon.