| 释义 |
eponychium Anat.|ɛpəʊˈnɪkɪəm|
[mod.L., f. Gr. ἐπί upon + ὄνυξ nail.]
a. The horny embryonic structure whence the nail is developed.
b. A film of epidermis covering the dorsal part of the nail; = quick n.1 4.
1885tr. P. G. Unna in H. Ziemssen Handbk. Dis. Skin i. 23 A trace of the horny layer of the first foetal months remains only on the ungual phalanx till a later period, and to this..I have given the name ‘eponychium’. 1892C. S. Minot Hum. Embryol. 555 The epitrichial layer over the area has received the special name of eponychium from Unna. 1902Cunningham Text-bk. Anat. 734 The part [of the epitrichium] which persists over the root of the nail is termed the eponychium, and covers the proximal part of the lunula. 1968Bloom & Fawcett Textbk. Histol. (ed. 9) xxii. 495 Under the proximal fold, the horny layer spreads onto the free surface of the nail body as the eponychium. |