The morphological structure of the brain of sexually mature Sepiella maindroni was examined in this study. Based on our observations, the brain of S. maindroni can be divided into three parts, which included a supraesophageal mass, a suboesophageal mass, and two advanced optic lobes referring to the esophagus. In addition, each mass can be sub- divided into different lobes. Observation of the microstructure and ultrastructure of the optic gland revealed that this gland was covered by a thin layer of connective tissue, which was located on the optic tract and between the olfactory lobe and the dorsal lateral lobe. Abundant secretory cells with the diameter of up to 10μm were observed within the optic gland. The ultrastructure of the secretory cells was examined using a Transmission Electron Microscope （TEM）, which revealed numerous rough endoplasmic reticula, Golgi apparatus, and electron dense granules inside the cells. These results will provide morphological basis for the research on physiology and development of neuromechanism in S. maindroni.%采用解剖学、组织切片以及电子显微镜技术,对成熟曼氏无针乌贼的脑部形态结构进行观察。结果表明,以贯穿脑的食道作为参照物,可将其脑分为三部分：食道上神经团、食道下神经团以及位于脑两侧两个发达的视叶,各个神经团又可以细分为不同的神经叶。同时采用光镜和电镜技术对内分泌器官——视腺做了显微结构和超显微结构的观察,结果发现,视腺外缘有结缔组织包裹,位于视神经束区上,嗅叶和背外侧叶之间,视腺内可观察到大量分泌细胞,细胞核较大,直径可达10μm;分泌细胞含有丰富的粗面内质网、高尔基体及很多高电子密度的分泌颗粒。此项研究结
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