umbo


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Related to umbo: gumbo, Umbo of tympanic membrane, Umbro

umbo

 [um´bo] (L.)
1. a rounded elevation.
2. the slight projection at the center of the outer surface of the tympanic membrane.

um·bo

, gen.

um·bo·nis

, pl.

um·bo·nes

(ŭm'bō, -bō-nis, -bō-nēs),
1. A projecting point of a surface.
2. Umbo of tympanic membrane.
[L. boss of a shield, a knob]

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.

umbo

(ŭm′bō)
n. pl. umbos or umbones (ŭm-bō′nēz)
A small anatomical projection on a surface, such as that on the inner surface of the eardrum at the end of the manubrium of the malleus, corresponding to the most elevated point of the eardrum.

um′bo·nal (ŭm′bə-nəl, ŭm-bō′nəl), um·bon′ic (ŭm-bŏn′ĭk) 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.

um·bo

, pl. umbones (ŭm'bō, -nēz) [TA]
1. A projecting point of a surface.
2. [TA]
Synonym(s): umbo of tympanic membrane.
[L. boss of a shield, a knob]

umbo

the pointed centre of a clam shell, being the oldest part around which are many concentric lines of growth.

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.

umbo

pl. umbones [L.] a round projection.

umbo membrana tympanae
the slight projection at the center of the outer surface of the tympanic membrane.
References in periodicals archive ?
The outer face is slightly concave and thick, with a strong tuberculate ornamentation in the postcentral umbo area.
Shell elongate with straight dorsal margin sloping posteriorly; anterior margin concave below beaks then rounding sharply before curving convexly into ventral margin; posterior margin straight dorsally, curving convexly into ventral margin; beaks located anterior of midlength, tightly incurved, prosogyrate; valve angulated from umbo to ventroposterior margin; surface with comarginal growth lamellae; anterior muscle scar well developed, hinge not observed.
Hoe help Paulus se kennis van Voortrekkerwaardes hom om as tussenganger tussen die uMbo en Cornelis Fick op te tree?
Shell elongated and slender with prosogyral umbo, which is terminal and not projecting above dorsal margin.
The reassignment of Unio nanaimoensis to Plesielliptio would be logical based on Russell's (3) first revision description, but Rhabdotophorus is equally likely without knowledge of the umbo and postumbonal sculpture.
0 cm of shell was exposed above the substrate; the umbo was protruding from the substrate at a 45[degrees] angle to the stream bottom and was parallel to the current, with the siphons facing upstream.
The second-and third-order costellae form bundles, the two median costae on the dorsal valve have up to eight costellae, two of which bifurcate close to the umbo.
However, we have found that when the distance between the promontory and the umbo is very short, there is little room for the endoscope to visualize the eustachian tube area.
They were initially thought to be only distinguishable by the number of rows of irregularly shaped nodes that curve posteroventrad from the umbo.