[Peritoneum: a new view of the problem].

The author suggests to differentiate the concepts of "location of the organs in regard to the peritoneum" and "coverage of the organs with the peritoneum". According to the author, all the organs, except the ovaries, are located extraperitoneally, but are covered with the peritoneum from one, three or all the sides.

[Information analysis of spinal ganglia].

Information parameters (entropia and redundancy) of cervical and thoracic spinal ganglia of albino rat foetuses, mature animals (cat and dog) and human subjects were analysed. Information characteristics of spinal ganglia were shown to be level-specified and to depend on their functional peculiarities. Information parameters of thoracic spinal ganglia of man and different animals are specie specified and may be used in assessment of morphological structures as information systems.

[The morphofunctional organization of the accessory olfactory organ in mammals].

The study was performed in 180 fetuses of albino rat aged 12-21 d, cat--5-120 mm parietococcygeal length and man--4-70 mm parietococcygeal length, divided into histological slices. Vomeronasal organ of mammals, human included was found to be closely connected with nasal cavity, being its derivative. Within the period of primary palate formation in animals vomeronasal organ opens up into primary choanae, being linked both with oral and nasal cavities in similar extent.

[The intermediate nerve system].

A comparative-embryological study (223 fetuses of man, cat, dog, albino rat and mole) has established a similarity in the development and structure of the intermediate nerve in mammalia. The nerve under study represents a complex structural-functional system. Its afferent component includes a geniculate ganglion, a nucleus of the solitary tract, root, peripheral branches.

[The intermediate nerve and its place in the system of cranial nerves].

The intermediate nerve (IN) in embryogenesis of man, cat and white rat is formed similarly. From the common with the VIII cranial nerve anlage the geniculum node, the vestibular and cochlear ganglia are emerged. A separated root of the IN connects the geniculum node with the nuclei, situating in the CNS.

[Structure and homodynamia of the intersegmental connection TI-TII].

The reason to consider the second thoracic cerebrospinal nerve (Th2) as one of the sources of the brachial plexus is the fact of the intersegmentary connection between Th1 and Th2 by means of a neural branch situating on the internal surface of the thorax near the vertebral column (the intrathoracic or paravertebral branch). However, not all cases of the intersegmentary connection Th1-Th2 should be regarded only as participation of Th2 in the formation of the brachial plexus, this is conditioned by certain peculiarities of its structure and by the character of interconnections with the I intercostal nerve. The macro-microscopic method demonstrates that the intersegmentary connection Th1-Th2 includes somatic and vegetative components, that to the same extent participate both in formation of the brachial plexus and in the I intercostal nerve.

[Disorders of vaginal development in the progeny of white rats exposed to x-ray irradiation].

One hundred and twenty white rat embryos 13-22-day-old have been irradiated with x-rays (the dose 250 R) on the 12th-14th day of embryogenesis. The embryos have been divided into series of sagittal, frontal, transversal sections and stained by means of general histological methods. The irradiation performed on the days mentioned does not affect formation of the paramesonephric ducts.

Functional anatomy of physiologic atresia in human and mammal embryogenesis.

1. Physiological atresias represent temporal functionate structures that appear and disappear in various organs at different stages in embryonic development. 2.

Ganglia formation of the peripheral nervous system.

Embryologic studies have shown that the ganglions of the peripheral nervous system are formed by the neuroblasts from the central nervous system. The histotopography of the neurons and their segmental communications with the central nervous system are established experimentally (segmental section of the ventral roots and resection of the spinal nodes: 100 experiments). It is proved that the neurons, which communicate with the definite segment of the spinal cord, are diffusely distributed in the ganglion mass.

[Development of the nasal cavity and formation of the nostrils in human embryogenesis].

The development of nasal cavity was traced in human embryos. The identity in the primitive formation of the mouth cavity and that of the nasal cavity is stated. During embryogenesis, the primitive nasal cavities are demonstrated to change their position concerning the mouth cavity.