[Degeneration and regeneration of sensory nerve fibers and their endings (receptors)]. / Degeneratsiia i regeneratsiia na setivnite nervni vlakna i na tekhnite okonchaniia (retseptori).

After cutting a nerve, inervating a certain part of the body/its nerve fibers and their terminals (receptors) undergo degeneration, which continues several days and proceeds in some of them unevenly quickly. They recover (regenerate) to their normal state and structure several months after the occurred complete destruction of the nervous fibers and terminals. The author describes the results from studies on the inervation of skin transplants and scars in experimental animals and persons to clarify the question about the origin of the regeneration nerve fibers--whether by growth of the central part of the cut nerve or by formation of this part independently in an area. The finding of capsulated receptors--the bodies of Meissner and bulbs with dense vindingsin 2 to 16-years old scars is a sure proof that regenerated nerve fibers and their terminals originate by growth from those cut at the surface of the grafting of the transplant e.g. from the central.

[Symmetry and asymmetry of the orbital opening in Bulgarians]. / Simetriia i asimetriia na vkhoda na orbitata u bulgarina.

The authors examined 412 skulls of grown up individuals of male sex and 15 dimensions were measured for aditus orbitae. The data were prepared biostaticaly both for the most important six and for the orbital index amd orbital entrance. The dimensions showed equal size at both sides in considerable, but various for the single numbers of skulls (1/5 up to over 1/3). In the majority of the remaining skulls the absolute differences were small in favour of the one or the other side (1--2 mm). The width of the entrance was in most cases (63%) larger in the right with mean value of the differences of 1,72 mm, but the height-on the left of the average with 1,41 mm. Hamachonchia was encountered more frequiently on the right, but hypoikonchia-on the left. The dimensions, which passed through the orbital entrance transversly (three dimensions) and obliquely (one dimension) had larger values more frequently on the right.

[Studies on the differences between the skin of nude mice and bald skin in man]. / Izsledvaniia vurkhu razlikite mezhdu kozhata na golite mishki i pleshivata kozha na choveka

The author carried out studies and established that in contrast to the bald skin of a man the elastic fibres in the skin of naked mice were completely normal and the small arteries and arterioles were with normal structure, because of which they could not be considered as a cause of degeneration of hair follicles, falling of hairs and of their irreplaceability with hairs grown externaly in these animals (fig. 4 a and b, fig. 5 a and b). The processes, occuring in the skin of the mice, are determined genetically and their manifestations represent changes in features, which, induced by mutation, are inherited.