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umbo
(redirected from umbonal)

    Also found in: Dictionary/thesaurus, Encyclopedia 0.01 sec.
umbo /um·bo/ (um´bo) pl. umbo´nes   [L.]
1. a rounded elevation.
2. the slight projection at the center of the outer surface of the tympanic membrane.
um·bo (mb)
n. pl. um·bos or um·bo·nes (m-bnz)
A small anatomical projection on a surface, such as that on the inner surface of the tympanic membrane at the end of the manubrium of the malleus, corresponding to the most depressed point of the membrane.
umbo·nal (mb-nl, m-bnl), um·bonic (m-bnk) adj.
umbo
Etymology: L, knob
a projection on any rounded surface, such as the inner surface of the tympanic membrane where the malleus is attached.
umbo
pl. umbones [L.] a round projection.
umbo membrana tympanae
the slight projection at the center of the outer surface of the tympanic membrane.
umbo 
An area (0.15 mm-0.20 mm) in the centre of the foveola. Stimulation of this area results in the highest visual acuity.


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