Fig. 6. Stage 16 in Development and gastrulation in Hyloxalus vertebralis and Dendrobates auratus (Anura: Dendrobatidae)

Fig. 6. Stage 16: Closure of the neural tube in embryos of H. vertebralis and D. auratus. Micrographs of H. vertebralis embryos are shown in A, C, and micrographs of D. auratus embryos are shown in B, D. Sections shown in C–D were stained for cell nuclei. (A–B) Dorsal views of embryos. The neural tube was closed. The branchial arches were visible in the head region. (C) Cross section through the rostral region, anterior to the notochord. The neural tube was completely closed. (Reproduced from Hervas and del Pino, 2013). (D) Cross sections through the trunk region of an embryo. The somites were visible. br, branchial arch; e, endoderm; ec, ectoderm; hy, hyoid arch; ma, mandibular arch; m, mesoderm; n notochord; nt, neural tube; s, somite.