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Fig. 3. Schematic diagrams showing landmarks for measurements of the bowhead
mouth's anterior and posterior openings (AO and PO, respectively) used in
constructing mathematical and physical models. (A) Transverse section at front
of oral cavity shows the relationships of tongue, lips and baleen, and the
locations of anterior vertical (dorsoventral; AV) and horizontal (frontal
plane; AH) dimensions. Specific demarcations of all measures defined in text
and in Table 1. (B) Lateral
view at rear of mouth, showing locations of posterior vertical and horizontal
(PV, PH, respectively) dimensions where filtered water exits this
unidirectional flow system; compare to Fig.
1 for a wider view.