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Figure 5 | Zoological Letters

Figure 5

From: On the peculiar morphology and development of the hypoglossal, glossopharyngeal and vagus nerves and hypobranchial muscles in the hagfish

Figure 5

Histological observations of hagfish muscle development. (A) Transverse section of a stage-53 Eptatretus burgeri embryo, cut at the posterior trunk level. Expression of MyHCA was detected by in situ hybridization. This gene was strongly expressed in the myotomal muscle plates (=precursor of the parietal muscles, m.par), and relatively weakly expressed in the abaxial muscles (m.dec + m.rect). (B) A transverse section adjacent to A, showing the expression of HandA, a marker of lateral plate-derived mesenchyme. HandA-expressing cells were predominantly located in the lateral body wall (arrowheads). (C) Reconstruction of a stage-53 embryo of E. burgeri showing the level of the section in D. (D) A transverse section cut at line D in C, showing the relationship between the parietal muscle anlage and the hypobranchial muscle anlage (m.obl + m.rect).

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