Flow through the apical gap and sensory channels.

<p>Flow patterns in the apical gap and sensory channels are visualized on planes at the locations indicated in (A). In (B), surface-limited streamlines and contours of the vertical component of the wall shear stress are used to visualize flow patterns within the sensory channels at a swimming speed of 1.55 m/s. The large black arrows illustrate the flow direction in the incurrent and excurrent channels. The dashed black line shows the flow path through the apical gap between the upper and lower lamellar arrays, and the dashed white lines illustrate the flow paths through the sensory channels. Positive values of shear stress indicate dorsally-directed flow, and negative values designate ventrally-directed flow. In (C), velocity contours on a slice through the apical gap show a relative comparison of the flow speeds in the apical gap and sensory channels. a: anterior; d: dorsal; l: lateral; m: medial; p: posterior; v: ventral.