
doi: 10.1007/bf01184798
pmid: 4144159
The hypothalamo-hypophyseal neurosecretory system (HHNS) was investigated in tadpoles and immature frogs of the speciesRana temporaria. Heterochronia was established in the formation of the preoptic nucleus (earlier differentiation of neurosecretory cells in the dorsal than in the ventral part). Differentiation of both parts of the preoptic nucleus is preceded by increased mitotic activity in the ependyma of the corresponding areas of the lateral walls of the third ventricle and its preoptic recess.
Hypothalamo-Hypophyseal System, Neurotransmitter Agents, Neurosecretion, Rana temporaria, Metamorphosis, Biological, Mitosis, Cerebral Ventricles, Pituitary Gland, Posterior, Ependyma, Larva, Animals, Anura
Hypothalamo-Hypophyseal System, Neurotransmitter Agents, Neurosecretion, Rana temporaria, Metamorphosis, Biological, Mitosis, Cerebral Ventricles, Pituitary Gland, Posterior, Ependyma, Larva, Animals, Anura
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