| 释义 |
conus|ˈkəʊnəs|
[L. conus cone n.1]
1. Anat. A conical structure or organ, e.g. in the heart, the conus arteriosus, the upper and anterior part of the right ventricle.
1885Sedgwick & Heathcote tr. Claus's Text-Bk. Zool. 146 An independently pulsating part of the heart with rows of semi-lunar valves (conus arteriosus). 1886W. N. Parker tr. R. Wiedersheim's Elem. Compar. Anat. 281 The longitudinal valve of the conus is incomplete. 1942L. H. Hyman Compar. Vert. Anat. (ed. 2) xii. 313 In tetrapods..the conus becomes embraced by the bulges of the atrium. 1949Adams & Eddy Compar. Anat. xii. 290 As the blood leaves the heart, it enters the conus arteriosus, a muscular structure containing valves that prevent the return of the blood to the heart. 1956W. J. Hamilton Textbk. Human Anat. 712 The lower end of the spinal cord forms a blunt tapering extremity, the conus medullaris.
2. A pale crescentic or annular patch near the optic papilla resulting from atrophy of the choroid and exposure of the sclera, and found esp. in cases of myopia.
1886Amer. Jrnl. Ophthalmol. Nov. 319 One of the appearances occasionally seen at the optic entrance—a form of conus so-called. Ibid. 321 A full discussion of the ‘congenital conus’ would require a number of illustrations. 1938S. Duke-Elder Text-bk. Ophthalmol. II. xxx. 1344 A congenital conus must be sharply differentiated from a myopic crescent. 1969F. W. Newell Ophthalmology (ed. 2) xvii. 282/1 A conus surrounding the entire disk may develop in glaucoma. |