Lüdke Julia, Lakes-Harlan Reinhard
Integrative Sensory Physiology, Institute of Animal Physiology, Justus-Liebig-University Giessen, Wartweg 95, D-35392 Giessen, Germany.
Arthropod Struct Dev. 2008 May;37(3):210-20. doi: 10.1016/j.asd.2007.10.001. Epub 2007 Oct 6.
After injury many arthropods are able to regenerate lost body parts and their innervation. Here, regeneration was studied in the desert locust Schistocerca gregaria after amputation of the midleg tibia and tarsus in the first larval instar. A regenerate was formed first in the third larval instar and it increased in size with each larval moult. The regenerate was always unsegmented and remained much shorter than the intact leg parts. The growth rate was initially rather high and decreased thereafter to that of intact parts. The amputation also influenced the growth rate of proximal leg parts (femur and trochanter) resulting in shortened leg segments. The regenerate carried many sense organs like trichoid sensilla and canal sensilla. The primary mechanosensory neurons of the trichoid sensilla projected somatotopically into the mesothoracic ganglion. A comparison of these projections from intact leg segments and regenerates showed a regrow into the target neuropil areas and a restoration of the somatotopy. Intact sensilla on the injured leg and regenerated sensilla expanded their central projections lateral-medially.
受伤后，许多节肢动物能够再生失去的身体部位及其神经支配。在此，对沙漠蝗（Schistocerca gregaria）一龄幼虫中腿胫节和跗节截肢后的再生情况进行了研究。再生首先在三龄幼虫期形成，并随着每次幼虫蜕皮而增大。再生部分始终不分节，且比完整的腿部短得多。其生长速率最初相当高，之后降至与完整部位相同的水平。截肢还影响了腿部近端部分（股骨和转节）的生长速率，导致腿部节段缩短。再生部分带有许多感觉器官，如毛状感受器和槽形感受器。毛状感受器的初级机械感觉神经元以躯体定位的方式投射到中胸神经节。对完整腿部节段和再生部分的这些投射进行比较，结果显示其重新长入目标神经纤维区域并恢复了躯体定位。受伤腿部上的完整感受器和再生感受器向内侧扩展了它们的中枢投射。
