FENESTRA
\fˈɛnɛstɹə], \fˈɛnɛstɹə], \f_ˈɛ_n_ɛ_s_t_ɹ_ə]\
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By William R. Warner
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An opening in a bone, or between two bones ; a pit on the head of the cockroach ; a transparent spot on the wings of insects.
By Henderson, I. F.; Henderson, W. D.
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Anatomists have given this name to two apertures, situate in the inner paries of the cavity of the tympanum. The one of these is the Fenestra ovalis seu vestibularis, Foramen ovale. It is oval-shaped; situate at the base of the stapes, and corresponds with the cavity of the vestibule. The other is the Fenestra rotunda seu cochlearis seu triquctra, Foramen rotundum. It is closed by a fine, transparent membrane, called Membrana Tympani secundaria, Tympanum minus seu secundarium, Membrana fenestrae rotundae, and corresponds to the inner scala of the cochlea.
By Robley Dunglison
Word of the day
Dopamine Acetyltransferase
- An enzyme that catalyzes the of groups from acetyl-CoA to arylamines. They have wide specificity for aromatic amines, particularly serotonin, and can also catalyze acetyl transfer between arylamines without CoA. EC 2.3.1.5.