The first signs of formation of the posterior serous lingual glands (von Ebner’s glands) were observed at day 22 of prenatal development of the rabbit. The development of glands was initiated by the appearance of epithelial bands, growing into the connective tissue. At day 26 p.c. the epithelial bands were longer. At day 1 of postnatal life the secretory parts of glands were formed together with excretory parts. Carbohydrates were found in the lumen of the excretory parts. At day 15 p.p. it was shown that the excretory parts opened at the bottom of furrows of foliate and circumvallate papillae. In the successive periods of life in the rabbit were observed linear arrangement for excretory parts opening at the bottom of furrows of foliate papillae. Excretory parts which opened at the bottom of circumvallate papillae formed a circular system.

A total of 129 tongues were analyzed, which were collected post mortem from rabbits (Oryctolagus cuniculus f. domestica), aged from day 15 of prenatal development (p.c.) to the 6th month of postnatal life (p.p.). The tongue was formed on the basis of its primordia starting as early as day 15 p.c. At that time the first primordia of lingual papillae were observed, which were primordia of circumvallate papillae. At day 18 p.c. the presence of primordia of fungiform papillae was shown, while at day 22 p.c. primordia of foliate and filiform papillae were found. On the dorsal surface of the tongue during the development the torus and median sulcus of the tongue were formed. The median sulcus ended in front of the torus of the tongue. The tongue in the rabbit increased in length from day 22 p.c. to the 6th month p.p. from 9 mm to 65 mm. During that time the weight of the tongue increased from 0.05 g to 9.59 g. The development of the final form of the tongue is a long-term process and occurs both during the prenatal and postnatal life. First primordia of gustatory papillae appear and only later primordia of mechanical papillae are formed.

Our paper describes case of lerneosis in rainbow trout (Oncorhynchus mykiss). Lerneosis is disease of fish caused by Lernaea cyprinacea. This species is a cosmopolitan ectoparasite, worldwide distributed. Invasion by L. cyprinacea were rare described in Poland. This parasite is highly adapted to a parasitic life. The life cycle of L. cyprinacea is composed of nine stages. After mating males (mature stage) subsequently die and mated females attach to the body surfaces of host fish and then passing trough the skin to the muscles. Infections of this parasite can cause localized inflammation and ulceration at the area of attachment and are entrance of secondary bacterial and fungal infections. Massive invasion in fish can cause serious economic problems.

The study has been conducted on 20 Bufflo female rats aged 4–6 months, from which the uterus strips have been taken directly after slaughter. Isolated uterus strips were placed in 4 automatic water bath chambers. After recording of spontaneous contraction activity of the isolated strip, calcium channel blockers i.e. diltiazem, nifedypine, verapamil were added into the bath organ. Doses of the preparations were determined experimentally. The experiments proved that an isolated uterus strip showed spontaneous periodical contraction activity for about 8-12 hours. An average contraction frequency amounted to 1.36 ± 0.33 contractions per minute, and strength of a single contraction was on average 2.7 ± 0.7 grams. Administration of oxytocin into the incubation bath organ increases the frequency (by 44.85 ± 13.42%) and strength (by 39.5 ± 18.33%) of the spontaneous uterine contraction activity. Administration of the calcium channel blockers: diltiazem, nifedypine, verapamil into the incubation bath organ causes a decrease or atony of the frequency and strength of the uterus muscular coat contractions depending on concentration of an active substance of the preparation. Nifedypine is the strongest calcium channel blocker. Blocking of the calcium channels with a 2.8 x 10^-8 mol/l dose of nifedypine resulted in a decrease in frequency by 40 ± 9.86%, whereas a dose ten times higher (2.8 x 10^-7) caused total atony of the spontaneous uterine contraction activity. Administration of oxytocin into the incubation bath organ after the prior total blocking of the Ca²⁺ channels does not result in an increase in the isolated strip contraction activity.