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. 2018 Aug 19;233(4):478–495. doi: 10.1111/joa.12860

Figure 9.

Figure 9

(I) Histochemically (purple‐dark blue) and (II) immunohistochemically (brown) stained smooth muscle fibres in a digital pad of Hyla cinerea. (A) Two thick muscle fibre bundles [black arrowheads in (A) and (B)] run from the distal tip of the distal phalanx towards the ventral epidermis, and distal‐cross‐lateral muscle fibres traverse the lymph space above the ventral dermis [grey arrowhead in (A)]; transverse section (AI: frog 3, digit FIII; AII: frog 1, digit FIII). (B) Thin muscle fibre bundles [grey arrowheads in (B)] traverse the lymph space ventrodorsally; sagittal section (BI: frog 3, digit FII; BII: frog 1, digit HI). Smooth muscle fibres also surround the mucus glands (stars). (C) A fine network of proximal‐cross‐lateral muscle fibres runs laterally through the ventral collagen layer below the widening base of the distal phalanx [black arrowhead in (C) and white arrowhead in (B)]; transverse section (CI: frog 3, digit FIII; CII: frog 1, digit FIII). Section orientations as in Fig. 7. CH, chromatophore.