Effects of SSCD and Its Repair on Movement of the Umbo
, Stapes Head, and RWM and the Effects of Location of Dehiscence according to LDV Measurements.
Alternatively, in a functionally relevant approach, the main traits of the shape of shell outline may be synthetically characterised by (i) the shell elongation, that is, the ratio of contour length to contour height, (ii) the valve dissymmetry, namely, the degree of dissymmetry of the position of the umbo
versus the anterior and posterior extremities of shell, and (iii) the ventral convexity, that is, the degree of prominence of the ventral side of the shell outline, opposite to umbo
where v is footplate velocity, PTM is sound pressure at umbo
, f is frequency, and D is footplate displacement.
In bivalves, the shell-growth process has frequently been schematised using a set of vectors diverging from the valve umbo
and rejoining the valve margin [8-10], the length of each vector thus representing the relative growth progress in the corresponding direction.
Pilsbry (4,7) referred Triassic freshwater mussels from the Newark Supergroup to modern South American families Mycetopodidae based on similarity of shell shape and Hyriidae based on radial umbo
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The rounded end near the umbo
is the anterior and is the thickest part of the shell while the posterior end is the thinner area.
The lesion had extended from slightly below the level of the pyramidal process to just anterior to the cochleariform process; it did not extend below the level of the umbo
The police acted after the protesters pelted them with stones in the town of Kom Umbo
, the source said.
If the Pentamerus oblongus were still there, the tip, or umbo
, of the fossilized shell would protrude from the rock.
They found the umbo
- where the eardrum connects to the hammer or malleus - produced the greatest sound vibration, particularly if the incus or anvil bone first was removed surgically.
Concha solida, subtriangular, umbo
cerca del extremo posterior con pico opistogirado, borde anterodorsal suavemente arqueado con extremo redondeado, extremo posterior anguloso y borde ventral arqueado; charnela taxodonta, con 20 dientes anteriores y 10 posteriores, el condroforo es oblicuo y profundo; color externo blanquecino con periostraco pardo olivaceo, brillante y muy adherente, el cual deja ver finas estrias concentricas en la conchilla; interior blanco nacarado y bordes de las valvas lisos.