| 释义 |
risorius Anat.|rɪs-, rɪˈzɔərɪəs|
[ellipt. for mod.L. musculus risorius (J. D. Santorini Observationes Anatomicæ (1724) i. 33), f. L. musculus muscle + risor laugher (f. rīdēre to laugh) + -ius, adj. suffix.]
A muscle of facial expression running from the parotid fascia to the corner of the mouth, variable in form and sometimes lacking.
1829J. & C. Bell Anat. & Physiol. Human Body (ed. 7) I. 279 [The Platysma myoides] terminates on the face and jaw. Some of its fibres, mounting over the bone of the jaw, are inserted near the depressor anguli oris; and others, a little higher on the face, are called risorius santorini. 1867W. Sharpey et al. Quain's Elem. Anat. (ed. 7) I. 176 The risorius or smiling muscle (Santorini), consisting of some very thin fasciculi,..joins the orbicularis and depressor anguli oris at the angle of the mouth. 1902D. J. Cunningham Text-Bk. Anat. 377 The risorius is a thin flat muscle which forms partly a continuation of the platysma myoides on the face, partly a separate muscle, with an origin from the masseteric fascia. 1936A. Huxley Eyeless in Gaza xviii. 233 The whole mechanism of the excruciating grimace, the upward and outward pull of the zygomaticus major, the sideways tug of the risorius. 1961L. F. Brosnahan Sounds of Language iv. 80 This suggests again a cline in gene frequency, the decrease in the mean height running in the same direction through the African-European-Asiatic population as the increase in the frequency of the occurrence of the risorius muscle in the face. |