| 释义 |
aditus Zool.|ˈædɪtəs|
[L., lit. ‘approach’, f. adīre, f. ad to + īre to go.]
An incurrent canal in a sponge. Hence adital |ˈædɪtəl| a.
1887Sollas in Encycl. Brit. XXII. 415/1 The prosopyles..may..be prolonged into..a prosodus or aditus... By the extension of the prosodal or adital canals..a still higher differentiation is reached.
Sense in Dict. becomes 2. Restrict Zool. to sense in Dict. and add: 1. Anat. An entrance to a duct or cavity; esp. the irregular aperture which connects the tympanic cavity of the ear to the air spaces of the mastoid process (more fully aditus ad antrum: cf. antrum n.).
1839Dunglison Dict. Med. Sci. (ed. 2) 15/1 Aditus, the entrance to a canal or duct. 1890Billings Med. Dict. I. 24/2 Aditus ad antrum. 1902A. Thomson in D. J. Cunningham Text-bk. Anat. 116 The middle ear or tympanum..opens into the mastoid antrum and mastoid air-cells by the aditus ad antrum. 1962Gray's Anat. (ed. 33) 1295 On the upper part of its anterior wall is an opening, the aditus to the mastoid antrum. 1970D. Wolff et al. Surg. & Microsc. Anat. Temporal Bone (1971) vii. 386 The medial wall..of the aditus ad antrum is formed by the eminentia canalis semi. lateralis. 1989Collier & Longmore Oxf. Handbk. Clin. Specialties (ed. 2) vii. 530 Posteriorly, there is communication via the aditus and tympanic antrum to the mastoid air cells. |