FINE-STRUCTURE OF A SENSORY ORGAN IN THE ARISTA OF DROSOPHILA-MELANOGASTER AND SOME OTHER DIPTERANS
FINE-STRUCTURE OF A SENSORY ORGAN IN THE ARISTA OF DROSOPHILA-MELANOGASTER AND SOME OTHER DIPTERANS
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DOI：
10.1007/bf00239448
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发表时间：
1989-11-01
影响因子：
3.6
通讯作者：
STEINBRECHT, RA
中科院分区：
文献类型：
--
作者：
FOELIX, RF;STOCKER, RF;STEINBRECHT, RA
Arista是双翅目触角的特征附属物，由底部的2个短节段和远端的长柄组成。在干的近端有一个小的感觉神经节，从中发出王室神经。对果蝇(果蝇)和家蝇(蝇)和苍蝇(Calliphora)的贵族感觉器官的精细结构进行了详细的研究。在果蝇中，贵族感觉器由3个相同的感受器组成，这些感受器在贵族干血淋巴空间内，而不是在外部的角质器中。每个感受器由两个双极神经元和两个鞘细胞组成；第三个鞘细胞包裹着神经节所有六个神经元的体细胞。神经元有细长的树突，通常分为内节和外节。其中一个外节高度片状，在细胞膜外部有小颗粒(凸起结构)；另一个外节不分枝，直径较小。第一个树突的精细结构强烈地让人想起从其他昆虫的触角中已知的温度感受器。这些温度感受器经常与湿度感受器偶联；然而，我们只能推测贵族器官的第二树突是否也具有这一功能。我们目前的结果与以前假设的机械感受性功能相反。蝇和丽蝇的贵族感觉器官与果蝇相似，但含有更多的感受器(蝇12只，丽蝇18只)。
The arista, a characteristic appendage of dipteran antennae, consists of 2 short segments at the base and a long distal shaft. A small sensory ganglion, from which arises the aristal nerve, is located proximally in the shaft. The fine structure of the aristal sensory organ was studied in detail in the fruitfly (Drosophila) and for comparison in the housefly (Musca) and the blowfly (Calliphora). In Drosophila, the aristal sense organ consists of 3 identical sensilla that termimate in the hemolymph space of the aristal shaft, and not in an external cuticular apparatus. Each sensillum comprises 2 bipolar neurons and 2 sheath cells; a third sheath cell envelops the somata of all six neurons of the ganglion. The neurons have long slender dendrites with the usual subdivision into an inner and an outer segment. One of the outer segments is highly lamellated and bears small particles (BOSS-structures) on the outside of its cell membrane; the other outer segment is unbranched and has a small diameter. The fine structure of the first dendrite is strongly reminiscent of the thermoreceptors known from the antennae of other insects. These thermoreceptors are often coupled with hygroreceptors; however, we can only speculate whether the second dendrite of the aristal organ also has this function. Our present results argue against mechanoreceptive functions, as formerly postulated. The aristal sense organs in Musca and Calliphora are similar to those in Drosophila, but contain more sensilla (12 in Musca, 18 in Calliphora).