[Histologic examination of some hippocampus fields after experimental ischemia].

The examinations of rats hippocampus were made after ischaemia (the rats vertebral and common carotid arteries were closed for 20 minutes). Serial sections of the brains were stained with hematoxylin and eosin. 24 hours after completing the experiment a small number of cells in the field CA1 was damaged.

Histological examinations of the influence of 6-hydroxydopamine (6-OH-DA) upon the ileum of the guinea pig.

Examinations of the influence of 6-OH-DA (6-hydroxydopamine) upon the structure of nerve cells and their axons have been conducted by many authors and in various aspects (1, 2, 8, 10). They have concerned histochemistry, fluorescence and ultrastructure of neurons and have shown that the substance evokes various changes in the perikaryons and axons of adrenergic neurons. The wall of the small intestine is innervated by external autonomyous nerves and fibres of the intramural autonomyous plexuses.

Ultrastructural study of odontoblasts of dental pulp in the cells aging process.

Odontoblasts located in the peripheral layer of the pulp reflect current state of the process connected with the formation of the secondary dentin and thereby they protect teeth from inflammatory processes (1, 3, 4, 6, 10). Odontoblasts are highly specialized cells that can react to the mechanical, thermic and toxic and bacterial traumas (12, 13, 14, 15).