Kent K S, Harrow I D, Quartararo P, Hildebrand J G
Cell Tissue Res. 1986;245(2):237-45. doi: 10.1007/BF00213927.
In the hawkmoth, Manduca sexta, the third segment of each labial palp contains a pit, which houses a densely packed array of sensilla. We have named this structure the labial pit organ (LPO). The sensilla within the pit are typical of olfactory receptors, characterized by a grooved surface, wall pores, and pore tubules. Axons arising from receptor cells that innervate these sensilla project bilaterally to a single glomerulus in each antennal lobe. We have compared this central projection with that in three other species of Manduca (M. quinquemaculata, M. dilucida, and M. lanuginosa) and in the silkmoths Antheraea polyphemus and Bombyx mori. A bilateral projection to a single glomerulus in each antennal lobe is present in all cases. We suggest that the LPO serves as an accessory olfactory organ in adult Lepidoptera.
在烟草天蛾（Manduca sexta）中，每个唇须的第三节都有一个凹陷，其中容纳着密集排列的感器。我们将这个结构命名为唇凹器官（LPO）。凹陷内的感器是典型的嗅觉感受器，其特征为表面有沟槽、壁上有孔以及有孔小管。支配这些感器的受体细胞发出的轴突双侧投射到每个触角叶中的单个神经小球。我们将这种中枢投射与烟草天蛾的其他三个物种（五斑烟草天蛾（M. quinquemaculata）、明纹烟草天蛾（M. dilucida）和毛纹烟草天蛾（M. lanuginosa））以及蚕蛾（多音大蚕蛾（Antheraea polyphemus）和家蚕（Bombyx mori））中的中枢投射进行了比较。在所有情况下，都存在双侧投射到每个触角叶中的单个神经小球的情况。我们认为唇凹器官在成年鳞翅目中作为一个辅助嗅觉器官发挥作用。
