摘要:脊髓背角某些神经元参与痛觉信息的传递,其中不少神经元对较细直径的躯体和内脏传入发生反应。各种研究证明,脊髓背角神经元的活动持续受到脊髓以上中枢,主要是皮层和脑干的控制。临床实践表明,针刺可以抑制内脏痛。我们在以往的工作中也看到,针刺可以激活包括中缝大核在内的脊髓以上中枢的活动,并由延脑通过下行抑制回路控制内脏传入信息的向上传递和抑制内脏躯体反射(VSR)。组织Unit discharges elicited by stimulation of the A-delta or C afferent fibres in the greater splanchnic nerve were recorded in the thoracic spinal grey matter of unanaesthetized immobilized cats. Electric stimulation of the intercostal nerve in the same segment of the recording site inhibited the evoked response in all 42 units observed. The time course of inhibition ind- uced by a single pulse stimulaion of the intercostal nerve was 350-650msec, suggesting that 2-3 pulses per second would be sufficient for electroacupun- cture of the same segment points. Repetitive electroacupuncture(100 pulses/ sec)at points on the lower limb inhibited the evoked response in 17 out of 23 units. Repetitive stimulation (100 pulses/sec) of the nucleus raphe magnus (NRM) inhibited the evoked response iu 41 out of 51 nuits. In these two ca- ses rpetitive stimuli would be necessary. The evoked responses of the units in the dorsal horn were always inhibited by electroacupuucture or NRM sti- mulatiou. The units in the ventral horn behaved in different ways: sonme were inhibited, some facilitated, and others not influenced by electroacupu- ncture or NRM stimulation.
摘要:延脑中缝大核(NRM)是中枢内源性下行痛抑制系统的重要核团之一,有工作表明,富含吗啡受体和内源性吗啡样物质(OLS)的中脑导水管周围灰质(PAG)是吗啡镇痛和脑刺激镇痛的高效区。在PAG注入吗啡或是进行电刺激,均能下行性抑制脊髓背角神经元的伤害性反应。若损毁NRM,则可阻断这种抑制作用。说明PAG对于痛觉的下行抑制有赖于NRM机能的完整性,PAG-NRM-脊髓背角神The influence of iontophoretic naloxone upon acupuncture effect was observed to explore the central locus of action of the endogenous morphine- -like substance (MLS) released by acupuncture. Extracellular recordings were obtained from 309 neurons located in the NRM with multiplepipettes on urethane anaesthetized male adult rats. Most units were spontaneously active and the majority of them (53 out of 74ne- urons, 72%) could be further activated by acupuncture. In most neurons (43 out of 47 neurons, 91.5%) two kinds of nociceptive neuronal responses to peripheral noxious stimulation, excitatory and inhiditory manifesting thems- elves by increasing and decreasing the firing rate were attenuated by acu- punctre. The activation of firing (up to 190% of preacupuncture control value; n=10) persisted for more than 15 minutes and gradually recoveed. When naloxone was administered iontophoretically before (for 2 minutes) and du- ring (for 5 minutes) acupuncture, the activation was blocked, the firing rate being slightly decreased (up to 80% of the control, д=10) rather than increased. In addition, the nociceptive response was significantly reduced (up to 54% of control, n=17, P<0.01) and did not recover within 30 minutes aftes cessation of acupuncture. However, in the other group of neurons(n=27), the nociceptive response was similarly reduced within ten minutes after ac- upuncture, but it was soon recovered to 95% of control following ejection of naloxone for two minutes(11th--13th minutes after acupuncture) indic- ating that the acupuncture inhibitory effect could be reversed. The above findings suggest that the MLS may be involved in acupunc- ture effect and it plays a role in acupuncure analgesia at least in partby activating the NRM neurons directly.
摘要:文献报道调节疼痛和血压的中枢之间有重叠,人和动物高血压情况下发生痛觉减退,中枢内参与痛和镇痛调制的递质系统如内源性鸦片样物质(endogenousOpiate-like Substance,OLS),5-羟色胺(5-HT),去甲肾上腺素(NA)等系统又都调节血压;因此,本工作检验;(1)具有镇痛作用的电针刺激对血压有何效应,(2)电针调制疼痛和血压的机理Our experiments showed that analgesic electroacupuncture (EA8/sec, 0.5 msec, 3V) had a pressor effect, and could increase the unit discharge of locus coeruleus (LC) and nucleus raphe magnus (NRM, both in contolling blood Pressure and pain) in conscious paralysed male rats. But the follow- ing further studies suggested that each of these two nuclei might have pla- yed a predominant role in regulating either pain or blood pressure. (1) The pressor effect of EA was similar to that of LC stimulation. This effect of EA and the excitatory response of LC to EA were not bloc- ked by naloxone. These results were likely to show that the EA pressor effect might be brought about through exciting LC neuron s and that endo- genous opiate-llke substance (OLS) might not be involved in this effect. (2) On the other hand, NRM stimulation had no significant influence on blood pressure, and the excitatory effect of EA on NRM neurons could be completely blocked by naloxone, which was consistent with the fact re- ported by others that EA analgesia could be blocked by naloxone. There- fore, it is possible that NRM does not play an important role in EA press- or effect, but plays a critical role in EA analgesla, which is mediated by OLS.
摘要:在痛觉生理研究中,丘脑作为皮层下躯体感觉的高级整合中枢,早已为人们所重视。其中髓板内核群、内侧核群及后核群与痛觉机制的密切关系也愈来愈清楚了。针刺镇痛的实验研究中,丘脑水平的工作基本都集中在髓板内核群中的束旁核(Pf),还有一部分中央外侧核(CL)的工作。有人认为,在丘脑接受痛觉信息的核团主要是Pf和CL,这些核团的单位痛放电可因针刺而抑制。但邻近的中央中核(CM)不接受痛觉信息,是接受针刺信息,对痛觉进行调节的机构。随着实验的深入,Pf在There are different views about whether the nucleus Centrum Median- um (CM) of thalamus could respond to the nociceptive stimuli. In the fi- eld of acupuncture analgesia research, however, there is rather Little investigation on CM. The aim of this paper is to explore the effect of electro-acupuncture on the single unit activity of CM. Experiments were carried out on awake and restrained cats. On the background of spontaneous activities, we found that some units of CM could respond to the nociceptive stimulation which was delivered to the nerve suralis. Based on the single unit activity evoked by the nociceptive stimulation, it could be divided into two types. One of them is the pattern of excitation and the other is the pattern of inhibition. Neither the non- nociceptive electro stimulation nor the brush hair can elicit any type of discharge mentioned above. After electro-acupuncture, discharge of excitatory pattern was depressed and the discharge of inhibitory pattern was attenuated. According to these findings, it is shown that (1) the peripheral nocic- eptive impulses can arrive at CM; (2) two kinds of information aroused from acupuncture and nociceptive stimulation may converge in CM; (3) the single unit activity evoked by nociceptive stimulation is weak ened by electroacupuncture. Therefore we suggest that the role of CM in pain and acupuncture analgesia should be elucidated by further investigations.
摘要:下肢穴位传入纤维大部分经过腰,骶节段后根进入脊髓,足三阳经(足阳明胃经、足太阳膀胱经和足少阳胆经)在下肢的穴位主要位于下肢的外侧及背侧,其传入纤维主要由骶丛的分支由腰4至骶2节段后根进入脊髓,切断腰4至骶2节段的后根,可取消针刺“足三里”的效应,腰4至骶2节段后根纤维进入脊髓后在中枢投射的部位,能反映出足三阳经在下肢穴区传人纤维向中枢投射的范围,而腰4至骶2节段后根纤维在脊髓和延髓内的投射的研究资料很少,至于到延髓的一些核团如三叉神经脊束核、巨细胞网状孩和小细胞网状The afterent fibers of the points of three Yang Channels of the Foot in the lower limbs enter the spinal cord by L4-S2 dorsal roots. In order to research that the afferent fibers of the three Yang Channels of the Fo- ot in the lower 1imbs projected to the areas in the centre, the present experiment adopted excision of L4-S2 neighbouring two spinal ganglions in the cats. The sections were stained with the Fink-Heimer's silver impreg- naton methods modified by Janet. The distributions of dorsal root fibers in the spinal cord medulla oblongata were observed. The degenerative fibers of L4-S2 dorsal roots going into the spinal cord were distributed over most areas of the dorsal funiculus. There were a mo- derate or a large number of degenerative fibers in the Rexed Ⅲ-Ⅸ lamina of the ipsilateral gray matter. The degenerative fibers continued 2-3 segments for rostral and caudal orientation. The degenerative fibers in the nucleus dorsalis continued 67 segments for rostral orientation. There were a few degenerative fibers in the Rexed Ⅷ-Ⅸ lamina of contralateral spinal cord. There were a large number of degenerative fibers in the middle region of the nuclei gracilisa, moderate number in the rostral region of the nuclei gracilis, a few in the contralateral rostral region of the nuclei gracilis, in the ipsilateral medial cuneate nucleus and lateral cuneate nucleus, in the caudal nucleus and middle nucleus of the spinal trigeminal tract on both sides, and in the nucleus reticularis giganocellularis and nucleus reticularis parvocellularis of the reticular formation on both sides. The results suggested that L4-S2 dorsal fibers projected to the Rexed V lamina of the spinal cord, the posterior column nuclei, the nucleus of the spinal trigeminal tract, the nucleus reticularis gigantocellularis and the nucleus reticuaris parvocellularis. Since the points of the three Yang Cha- nnels of the Foot in the lower 1imbs situated in the dorsal and lateral po- rtion of the lower limbs, the.afferent fibers entered the spinal cord by L4 -S2 dorsal root. Therefore the projection areas in the centre by L4-S2 do- rsal root fibers reflected the projection areas in the centre, into which the afferent fibers of the three Yang Channels of the Foot in the 10wer limbs projected. In order to study the mechanism of acupuncture activity on the points of the three Yang Channel of the Foot in the lower limbs and the theory concerning the relationship between the Channels and Zang-Fu organs, the results provided some morphological evidence.
摘要:足三里穴为临床治疗腹部脏器疾病的主要穴位。在针麻手术中,如胃大部切除,胆囊切除,阑尾手术等也都是作为主穴。对于足三里穴区的研究,以往多着重于以下几个方面:如对传入神经纤维组成的研究,认为有髓传入纤维多于无髓传人纤维,针刺镇痛显效动物的足三里穴区中,有髓与无髓传入纤维的数目比例为2.7:1,无髓传入纤维在针刺镇痛中似不起主要作用,对“足三里“穴针刺镇痛点的传入纤维的速度及传入纤维的直径的研究,认为针刺“足三里”“显50ul of 10% horseradish peroxidase (HRP) solution were injected into the area of Zusanli point in twenty rabbits. After a survival of six to seven days the animal were sacrificed and their hearts were perfused with 2% paraformaldehyde solved in 0 1M phosphoric acid buffer (pH7.27.3). The spinal ganglia Were treated according to HRP method and incubated in 3'-3diaminobenzindine (DAB) H_2O_2 solution. The distribution of the HBP labeled cells were examined under microscope and the results were as follows. We could find clearly labeled cells appearing in the spinal ganglia from tho- racic 6-12 (T6-12) and lumbars 1-7 (L1-7) to sacral. Moreover it was found that labeled cells were of different sizes, but most were large cells. A new point of view has been put forward by the above experimental studies, i.e. the segment of the "Zusanli" afferent fibers is longer (from thorax 6 to sacral 3) and contains large, middle and small cells. This pro- vides a morphological foundation for the treatment of stomach and intes- tinal diseases by acupuncturing "Zusanli" point.
摘要:动物脑内许多重要的化学物质,如乙酰胆硷,r-氨基丁酸,肽类物质和环核苷酸等含量的高低与动物处死方法有密切关系。因此如何迅速终止脑内生化反应,准确反映动物死前瞬间化学物质的实际含量,这是神经化学研究中必须解决的一个重要问题。70年代以来,微波在生物学作用中的研究进展很快,尤其是应用微波技术来研究中枢神经系统的功能引起了特别注意。利用微波穿射动物头部时产生的热效应,可以迅速灭活脑内The purpose of the present work is to compare the contents of cyclic nucleotide in cerebral cortex, thalamus, hypothalamus and middle central grey of rats and rabbits by irradiation with high power model WSB-1 mi- crowave and decapitation. The results indicated that the levls of cAMP in brain areas were much higher in the decapitaion group than those in the microwave irradiation and the contents of cGMP in brain were obviou- sly decreased in decapitated animals. According to the experimental resu- lts of direct measurement of temperature and activity of phosphodiesterase in brain areas, the microwave apparatus has been proved extremely effici- ent. It is simple in construction and convenient in use. It can kill not o- nly rabbits and cats in 2 sec. but also rats and mice in 1.4-1.6 sec. It su- pplies an advanced technical means for studying neurochemistry,