St24-13.5hpf

late tailbud II (13.5 hours), the notochord vacuolation begins partially and palps formation is intiated by a thickening and bulging of the anterior most trunk epidermis. Tail straightens in its anterior part. Ratio of the thickness of the notochord cells along the DV and AP axis is about 1.2

 

Three-dimensional images (upper) and cross-section images (lower). Anterior is left in all panels. Arrow indicates the position of pigment cells. Arrowheads indicate the cilia of epidermal sensory neurons. b.p., blastopore; n.p., neuropore; epi, epidermis; ec, endodermal cavity; en, endoderm; es, endodermal strand; b, brain; mu, muscle; g, germ line cells; noto, notochord; n.t., neural tube; ec, endodermal cavity; t.epi.m-l.r, tail epidermis medio-lateral row; t.epi.m.r, tail epidermis medial row; t.epi.l.r, tail epidermis lateral row; va, vacuole; p, palps. In I, embryo direction is shown by A: anterior, P: posterior, D: dorsal, V: ventral. Scale bar = 50 micro m.