碩士 / 國立清華大學 / 系統神經科學研究所 / 105 / Coleoid cephalopods are well known for their ability to rapidly change body patterns for communication and camouflage. This is primarily achieved by neural control of chromatophores in the skin. The neural connection of the chromatophore system in the central nervous system has been well studied. However, the specific mechanism of the peripheral neural control of chromatophores remains unknown. To determine the mechanism of the peripheral pathway, the several neurotransmitters such as L-Glutamate (L-Glu), serotonin, acetylcholine (ACh), AMPA, and NMDA were applied to the skin of oval squids (Sepioteuthis lessoniana) in vivo and the corresponding chromatophore expansion and retraction were recorded. The results showed that AMPA- and NMDA-like receptors expressed on radial muscles are involved in a postsynaptic mechanism to differentially control yellow and brown chromatophore expansions, and ACh is involved in a presynaptic mechanism of chromatophore control. In a separate study, cuttlefish embryos (Sepia pharaonis) were used to examine the peripheral development of the chromatophore system. The results showed that chromatophores are functional at embryonic stage 26 as evidence of its response to L-Glu and serotonin applications in vitro. In addition, three different checkboard backgrounds (small low-contrast, small high-contrast, and large high-contrast) were used to examine cuttlefish embryo’s ability of body patterning development. The results showed that cuttlefish could express some disruptive components at stage 27, though the full function of body pattern control was not developed completely before hatching. Taken together, this study suggests that the peripheral neural control of the chromatophore system develops early and is regulated by both pre- and post-synaptic mechanisms with various neurotransmitters.
| Identifer | oai:union.ndltd.org:TW/105NTHU5291001 |
| Date | January 2016 |
| Creators | Shih, Bing Hong, 施秉宏 |
| Contributors | Chiao, Chuan Chin, 焦傳金 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 52 |
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