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
Sociopolitical issues of anatomy in America in the 19th century executed, "i.e.", hanged criminals, thus many perceived morbid anatomy for anatomical studies as punishment that is only justified to inflict on the morally condemned. Medical grave robbing incited widespread anger and abhorrence, resulting in at least seventeen full-fledged anatomy riots in the United States between 1785 and 1855, in Connecticut, Vermont, Ohio, and elsewhere. Although a law which outlawed body snatching, and allowed executed criminals to be dissected after death, was passed by the New York legislature after the 1788 riot, medical students continued to face a shortage of cadavers, and so grave robbing persisted These anatomy riots involved citizens