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Fig. 2. Morphology of the cranial musculature in the head of the spotted ratfish
Hydrolagus colliei. (A) The schematic on the right illustrates the
musculature labeled on the left. (B) The twisted portion of the tendon
(circled) expanded. Although all three adductors insert on the lower jaw, only
the anterior adductor (AMA-
) exhibits a pronounced twist in its tendon
(its approximate middle indicated throughout the figure by a white arrow)
where the anterior face (red arrow) inserts more posteriorly than the
posterior face (blue arrow). The Hydrolagus schematic shown here is
used in the remainder of the figures with the anterior jaw adductor isolated
for clarity. AMA-ß, posterior division of the anterior adductor
mandibula; AMP, adductor mandibula posterior.
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