Otic vesicle chick, invagination of the otic placode occurs passively due to the movements of the surrounding placode. The otic placode in zebrafish, on the other hand, occurs by cavitation; the ectodermal placode condenses and forms an ovoid ball directly below the embryo surface. Otic vesicle formation occurs later, during the 25-30 somite stage in mice. Otic vesicle Otic vesicle, or auditory vesicle, consists of either of the two sac-like invaginations formed and subsequently closed off during embryonic development. It is part of the neural ectoderm, which will develop into the membranous labyrinth of the inner ear. This labyrinth is a continuous
History of anatomy well as his demonstrations, in his research as well as his teaching." In 1540, Vesalius gave a public demonstration of the inaccuracies of Galen's anatomical theories, which are still the orthodoxy of the medical profession. Vesalius now has on display, for comparison purposes, the skeletons of a human being alongside that of an ape of which he was able to show, that in many cases, Galen's observations were indeed correct for the ape, but bear little relation to man. Clearly what was needed was a new account of human anatomy. While the lecturer explained human anatomy, as revealed by Galen