[Structure of the mammillary bodies of the hypothalamus of the bottlenosed dolphin]. / Stroenie sostsevidnykh tel gipotalamusa del'fina afaliny.

In the bottlenosed dolphin (Tursiops truncatus) the hypothalamic corpus mammillaris has been studied using interperpendicular, sagittal, frontal and horizontal serial sections, impregnated in silver and stained with cresil-violet. Comparatively small dimentions of the corpora mammillaria in the bottlenosed dolphin are explained by presence of only two nuclei, medial and lateral. The lateral nucleus is nearly three times as large as the medial one. The size of the neurons in the medial nucleus is on the average two times as large as that of neurons in the lateral nucleus. The density of the neural cells distribution is a little greater in the lateral nucleus. The structure of the bottlenosed dolphin corpora mammillaria is compared with similar structures in other animals and the human being.

[Myeloarchitectonics of the hypothalamic mammillary bodies in the bottle-nosed dolphin]. / Mieloarkhitektonika sostsevidnykh tel gipotalamusa del'fina afaliny.

The topography of the main fibrillar bundles realizing the neural connections of the corpora mamillare of the dolphin (Tursiops truncatus) hypothalamus has been studied using sagittal, frontal and horizontal serial sections impregnated with silver nitrate and stained with cresil violet. The dolphin main afferent (fornix, mamillary peduncles) and efferent--mamillary-thalamic, mamillary-tegmental tracts--of the corpora mamillare--have an original topography and dimensions distinctive from those of terrestrial mammals, the human being including.

[Morphology of the synaptic apparatus of the motor neurons of the frog's spinal cord]. / K morfologii sinapticheskogo apparata dvigatel'nykh neironov spinnogo mozga liagushki

The method of light microscopy was used in order to study the synapses of motor neurons of the thoracic and lumbar parts of the spinal cord of intact frogs. Under study were the shape of the synapses, their size, as well as the quantitative distribution on the bodies and dendrites of neurons. It was established that the distribution density of active synaptic terminations on the motor neurons of the lumbar part was higher than the density of active synapses in the thoracic part, and the amount of synaptic terminations on dendrites was greater than on the neuron bodies; the snyaptic terminations of different shape were different in size; the occurrence of certain shapes of synaptic terminations in the thoracic and lumbar parts was almost the same.