Brain ventricle development in H. huso (Beluga sturgeon) larvae

Abstract

The development of ventricles in the brain of H. huso (Beluga sturgeon) from 1 to 54 days old is presented in this study. The components observed in the 1-day-old ventricular system were the telencephalic, tectal, and cerebellar ventricles. These ventricles were not observed to have any recess or sulcus. They were surrounded by copious ependymal and embryonic cells. Two different parts were detected in the 6-day-old telencephalic ventricle: the olfactory and lateral ventricle. The olfactory ventricle was observed as a cranial extension of the telencephalic ventricle from 6 days old, as was the inner cell layer of the olfactory bulb (ic) adjacent to this extension. In the preoptic region, the lateral ventricle was connected to the preoptic recess from 15 days old, and this recess was connected by the interventricular foramen to the third ventricle in the diencephalon. At 6 days old, the third ventricle in the diencephalon was visible at the caudal part of the lateral ventricle, and the third ventricle had a recess near to the inferior lobe of the hypothalamus. At 6 days old, the tectal ventricle was observed to have bilateral extensions which proceeded to grow with age. The cerebellar ventricle, situated between the two lobes of the cerebellum, was observed from 1 day old. The cerebellar ventricle grew with age, extending laterally from 6 days old. The connection of the cerebellar ventricle to the fourth ventricle in the medulla oblongata was visible from 6 days old. Upon dividing the ventricular system into three regions (forebrain, midbrain, and hindbrain), stereological studies performed utiizing Cavalieri's principle indicated that the forebrain ventricular region had the smallest volume while the hindbrain ventricular region had the largest.

Telencephalic eversion in embryos and early larvae of four teleost species

“…By 1 dpf, the telencephalic ventricle has very similar morphology to that observed here in teleosts (see figure 1 in Tavighi et al, 2016). However, by 6 dpf ventricle morphology is much more complex, showing more grooves than in teleosts (see figure 2 in Tavighi et al, 2016). Vazquez et al (2002) studied telencephalon development in Acipenser naccarii but they do not show horizontal sections or dorsal views, so it is not possible to determine the whole morphology of the ventricle.…”

“…We believe it could be valid to explain the appearance of the everted morphology of the telencephalon in these groups, but not to account for the appearance of the internal ventricle in the olfactory bulb. Interestingly, Tavighi et al (2016) studied ventricle development in beluga sturgeon ( Huso huso ). By 1 dpf, the telencephalic ventricle has very similar morphology to that observed here in teleosts (see figure 1 in Tavighi et al, 2016).…”

“…Interestingly, Tavighi et al (2016) studied ventricle development in beluga sturgeon ( Huso huso ). By 1 dpf, the telencephalic ventricle has very similar morphology to that observed here in teleosts (see figure 1 in Tavighi et al, 2016). However, by 6 dpf ventricle morphology is much more complex, showing more grooves than in teleosts (see figure 2 in Tavighi et al, 2016).…”

Telencephalic eversion in embryos and early larvae of four teleost species

“…By 1dpf, the telencephalic ventricle has very similar morphology to that observed here in teleosts (see Fig. 1 in Tavighi et al, 2016). However, by 6dpf ventricle morphology is much more complex, showing more grooves than in teleosts (see fig.…”

“…However, by 6dpf ventricle morphology is much more complex, showing more grooves than in teleosts (see fig. 2 in Tavighi et al, 2016). Vazquez et al (2002) studied telencephalon development in Acipenser naccarii but they do not show horizontal sections or dorsal views, so it is not possible to determine the whole morphology of the ventricle.…”