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Fig. 1. Branching pattern of fin nerve in Sepia officinalis. (A) Drawing
illustrating the bilateral branching pattern from a 17.5 cm mantle length
male. Primary anterior branches are colored red on the upper half of the
diagram and are labeled from anterior to posterior on the lower half of the
diagram (A1-A4, bold; colored orange, yellow, green, blue). Primary posterior
branches are labeled from posterior to anterior on the upper half of the
diagram (P1-P4, bold; colored purple). Subsequent branches (2°, 3°,
4°) are indicated by normal, italic and underlined text, respectively. (B)
Photomicrograph showing the branching pattern on the left side of a 10.8 cm
mantle length male. Several anterior branches (a), posterior branches (p), and
blood vessels (bv) are labeled. Inset is a drawing of the nerves in the
photograph; blood vessels are colored black. Scale bar, 2 mm.
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