| 单词 | perifoveal |
| 释义 | perifoveal, a. Anat.|pɛrɪˈfəʊvɪəl|
[f. peri- + fovea.]
Applied to the part of the retina regarded as the periphery of its central region, surrounding the parafovea.
1926Brit. Jrnl. Ophthalm. X. 229 (heading) The perifoveal circulation. 1941S. L. Polyak Retina xv. 196 From the axial center to the anterior retinal boundary there are..seven regions: the central area, composed of (I) central fovea, (II) parafoveal region, and (III) perifoveal region or areal periphery; and the extra-areal periphery, composed of (IV) near periphery, (V) middle periphery, (VI) far periphery, and (VII) extreme periphery. Ibid. xvi. 213 The perifoveal region or the periphery of the central area is its most outward belt... Inwardly it begins at points where the ganglion cell layer still contains four rows of cells. Outwardly it ends where the ganglion layer becomes reduced to a single row of closely packed cells. 1966Jrnl. Physiol. CLXXXVII. 456 There is considerable antagonistic interaction between rod and cone signals at the ganglion cell layer in the perifoveal retina of dark-adapted monkeys.
Hence (as a back-formation) periˈfovea, the perifoveal region.
1963H. Davson Physiol. of Eye (ed. 2) ii. i. 86 (heading) Parafovea and perifovea. 1964J. Z. Young Model of Brain ix. 160 The larger parasol bipolars and garland and giant ganglion cells make contact with hundreds or thousands of bipolars and thus cones (and rods) of the fovea and perifovea. 1975Nature 6 Feb. 406/2 When fovea and perifovea are stimulated together (as in everyday life) foveal responses are relatively depressed suggesting that different retinal regions interact abnormally. |
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