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单词 bouton
释义 bouton|butɔ̃|
[Fr., = button.]
1. In pearl bouton, bouton pearl, anglicization of perle bouton, a round pearl with a flat back marking the place where it was attached to the shell.
1851Illustr. Catal. Gt. Exhib. iii. 689 Brilliant tiara, ornamented with fine oriental pearl drops and boutons.1907Daily Chron. 5 Apr. 4/5 An exquisite pearl and brilliant necklace, formed as fifteen graduated drops, each composed of one bouton pearl, one brilliant, and one pear-shaped pearl drop.1927Daily Express 9 May 5/3 If it is a round pearl, with a flat back showing where it was attached to the shell, it will be called a ‘bouton’ pearl.
2. The button-like end of a honey-bee's tongue.
1886F. R. Cheshire Bees & Bee-Keeping 95 The central and side ducts run down to that part of the tongue where the spoon, or bouton is placed.




Add:3. Anat. An enlarged part of a nerve fibre or cell, esp. an axon, where it forms a synapse with another nerve; bouton terminal (pl. boutons terminaux), a single bouton at the tip of a nerve fibre; bouton de passage (pl. boutons de passage), each of a series of boutons along the length of a nerve fibre.
[1918Jrnl. Compar. Neurol. XXX. 153, I could not find any place where the contact between the ‘botones de traecto’ and the cell surface takes place, as was described..by Cajal.]1932Proc. R. Soc. B. CXI. 176 In preparations of new-born kittens it is impossible to observe any boutons on any of the cells in the cord.Ibid., The boutons terminaux are small, oblong loops occurring at the end of nerve fibres and applied to cell-bodies and their dendrites. The boutons de passage are similar structures..found along the length of the finest nerve fibres, on both cell- and dendrite-surfaces.1937A. Kuntz Text-bk. Neuro-Anat. (ed. 2) v. 99 Fiber terminations consisting of delicate end-bulbs or end-loops (boutons).1970T. S. & C. R. Leeson Histol. (ed. 2) x. 196/2 (caption) Photomicrograph of an anterior horn cell to show boutons terminaux on the cell body and its dendrites.1970Nature 4 Apr. 21/1 Dense granular vesicles probably containing dopamine are present in the terminal boutons of striatal nerve endings.1985C. R. Leeson et al. Textbk. Histol. (ed. 5) vii. 207/1 In some cases, telodendria with their boutons are so numerous as to surround the neuron on which they terminate in a basket-like arrangement.
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