Objective To investigate the correlation between eigenvalues(λ∥ andλ⊥)of sciatic nerve and limb function in a rabbit model of acute nerve traction inj ury for finding the role ofλ∥ andλ⊥ on diagnosis of nerve inj uries.Methods The right sciatic nerves of 32 Newland rabbits were selected to be performed as traction injury,and then left sciatic nerves were treated as control for the sham operation side.MRI DTI scan was performed before and after the operation on 1 day ,3 day,and 1 week,2,3,4,6 and 8 weeks respectively.Theλ∥ andλ⊥ of inj ured sciatic nerves and sham operated nerves were measured,meanwhile functional exami-nations were evaluated,and then analyzing the correlation betweenλ⊥ of inj ured sciatic nerves and the score of inj ured limb function in the periods of 3 days to 8 weeks;finally different portions of sciatic nerve were removed for histological examinations.Results Theλ⊥ of inj ured sciatic nerves in the proximal portion was slightly increased at 3 days and recovered to the normal at 2 weeks.Theλ⊥ of inj ured sciatic nerves in the traction portion and distal portion were slightly raised at 1 day,reached to its maximum value at 3 days,and then decreased gradually after 1 week and dropped to the pre-operation level after 4 weeks.Theλ⊥ of inj ured sciatic nerves in the proximal portions was significantly higher than that of the sham-operated nerves from 1 day to 1 week(F=7.275,P=0.000). Theλ⊥ of inj ured sciatic nerves in the traction portion and distal portion were significantly higher than that of the sham-operated nerves from 1 day to 3 weeks(F=5.851,F=3.794,P=0.001,P=0.000).However,there was no significantly difference between theλ∥ of inj ured nerves in each portion and sham-operated nerves .The negative correlation between theλ⊥ of inj ured sciatic nerves in the distal portion and the score of the nerve function in the injured limb was found (r=-0.938,r=-0.897,P<0.01).Conclu-sion Theλ⊥ of inj ured nerves in the traction portion and distal portion could monitor the process of degeneration and regeneration of sciatic nerve in traction inj ury,while theλ∥ plays no obvious role in diagnosis of nerve inj uries.

The Republic of China period （1912—1949） was an important stage of transition from traditional herbalism to clinical Chinese materia medica. The clinical application of Chinese materia medica became the focus of academic attention. During the Republic of China period， the research objectives， methods， and content of clinical Chinese materia medica were clarified， and the basic framework of Chinese materia medica was established through efficacy classification and item description. Based on the historical background at that time， striving for survival in adversity were the internal factors driving the construction of clinical Chinese materia medica， and the rise of academic education and the popularity of traditional Chinese medicine journals provided favorable conditions for the development of clinical Chinese materia medica. The clinical Chinese materia medica during the Republic of China period gradually formed a theoretical structure and core content that was distinctly different from that of traditional herbal medicine， which was integrated with the scientific research of Chinese materia medica and promoted the continuous development of Chinese materia medica together with other subdisciplines， presenting distinctive characteristics of the times and important academic significance.

Major depressive disorder (MDD) has become an increasingly serious public health issue, characterized by high incidence and high disability rates. It often coexists with other mental health problems and physical diseases, with a significant negative impact on patients' quality of life. In clinical practice, MDD is considered a heterogeneous disease. The complexity of the pathological mechanisms and the variability in treatment responses lead to a lack of clear therapeutic targets, which complicates the treatment process. In recent years, with advancements in neuroscience, the crucial role of microglia in the pathogenesis of MDD has been revealed. As the main immune cells in the brain, microglia are not only involved in the regulation of neuroinflammation but also play important roles in neurogenesis and neuronal regulation in MDD. This article mainly discusses the role of microglia in the pathophysiological mechanisms of MDD, aiming to provide a theoretical basis for microglia as a potential target for the treatment of MDD.