Cardiac muscle fibers have been found to extend from me left auricle along the pulmonary veins as far as the hilus of the lungs in man, in dogs, and in rodents such as the guinea pig. In other rodents, however, the cardiac muscle extends into the veins of the lung itself. To study the occurrence of cardiac tissue in the pulmonary veins, the lungs of selected rodents which represent nine superfamilies have been examined. Only the guinea pig, Cavia porcellus, was limited to having cardiac muscle in the extrapulmonary veins. All of the other 47 species examined had intrapuimonary extensions of cardiac muscle to various distances along the pulmonary veins. It is apparent that this morphological feature is not a specialization among a few families of rodents, but is probably a feature common to almost all of the rodents.

Data were collected from a colony of 49 male and 55 female twoyear-old Mongolian gerbils, Meriones unguiculatus (Milne-Edwards, 1867). This report gives tables which present data regarding linear measurements of body and organs and absolute and relative organ-weight data. The means, stafldard deviations, ranges, and coefficients of variation were summarized in the tables. Grossly observed pathological organs were omitted from the study. The tables give information about this species which could be helpful in future laboratory investigations where the bodyand organ-weight ranges, variability and linear measurements of this species may be of practical value.The literature contains many references in which various species of Gerbillinae have been used for research purposes. The references below indicate a recent interest in the use of the species presented here, the Monoglian gerbil, Meriones unguiculatus, (Milne-Edwards, 1867). This study was initiated because of the increased interest in this animal and the lack of quantitative information regarding body-weight and organ-weight data in adult male and female gerbils.Some metabolic characteristics of this essentially desert rodent, which included determinations of critical body temperature, thermal neutrality, heat tolerance, oxygen consumption, and metabolic rate, were done by Robinson ('59). This gerbil responds to the oral administration of cholesterol with a marked elevation of blood cholesterol, but without any significant atherosclerotic plaque formation (Clarkson, King and Warnock, '57; Gordon and Cekleniak, '59 and '61). Besides these studies other investigations encompassing a variety of factors affecting blood cholesterol levels in this animal have been reported by Gordon, Stolzenberg and Cekleniak ('59); Gordon and Cekleniak ('60 teins by Dellenback and Ringle ('63). Animals of this species have been trained for use in investigations of conditioned avoidance-escape behavior for the differential evaluation of drugs affecting the central nervous system ( L a t h e r and Cekleniak, '64).In the search for suitable vertebrate hosts for model parasitic infections, Meriones unguiculatus has been infected with Nematospiroides dubius in a study by Cross and Scott ('60), with Trichostrongylus axei by Leland ('61), with Leptospiru pomona by Lewis and Gray ('61), with Haemobartonella by Najarian ('61), and with Echinococcus multilocularis by Norman and Kagan ('61 ). MATERIAL AND METHODSThe original stock of Meriones unguiculatus was obtained from the gerbil colony at Tumblebrook Farm, Brant Lake, New York.Random inbred pairs of animals were kept in metal cages, 10 X 15 inches, with two inches of Sterolit animal bedding and a four-inch diameter, clay flower pot for additional seclusion.Nineteen females were bred and produced 26 liters of 4 to 9 animals per litter, with an over-all average of six per litter. After four weeks, the males and females of each litter were placed in separate cages. All animals were maintained on a diet consisting of 10% sunflower se...

J Hand Microsurg 2016;8:150-154.

Because the perforation rate and thus the time for glove changing depend on the type of the surgery, the results found in visceral surgery can not be transferred to other surgical special-ties without additional scientific evidence. Further studies are needed that correlate the types of surgical procedures with specific perforation rates in order to provide basis for solid -recommendations helping to improve patients' and medical staff's safety.