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Fig. 8. (A) Cross-section through the trunk muscles of a larva of 2 d.p.f. (B)
Idem, but for the 15 d.p.f. stage (see also Movie 1 in supplementary
material). Note the relatively large size of the spinal cord and notochord in
the 2 d.p.f. stage compared with 15 d.p.f. In the 15 d.p.f. stage many muscle
fibres attach to the medial septum that is thought to undergo only very small
changes in length during swimming. The measured muscle-fibre orientations and
predicted strains with the lowest coefficient of variation corresponding to A
are shown in Fig. 9A,D. For B,
the corresponding panels are Fig.
9B,E. (C) Cross-section through a portion of the trunk of a
juvenile zebrafish of 45 days [stained according to Crossmon
(Crossmon, 1937)]. The epaxial
(E) and hypaxial (H) multilayers of connective tissue (MESP and MHSP) are
indicated. These connective tissue sheets are oriented almost parallel to the
horizontal septum and are formed by a close junction of neighbouring myosepta.
They have to transmit the forces of the muscle fibres that attach with very
different orientations at the dorsal and ventral side of the multilayers (as
shown in Fig. 9C), and thus
cannot balance their forces.
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