Stage 33 (4 days 10 hrs) Notochord vacuolation
Drown by T. Iwamatsu
(Abbr. mf: membranous fin, no: notochord, op:, olfactory pit)
Stage 33 (4 days 10 hrs) Stage at which notochord vacuolization is completed:
The tail tip has not yet reached within interocular distance of the eye. Because the eyeball (choroidea) is very dark, the lenses can be seen only with strong transillumination. The notochord is completely vacuolized to the end of the tail. The pineal gland is distinct at the dorsal surface of the vascularized forebrain. The tips of the membranous margins of the pectoral fins reach the 4th somite.