[Structure of the rete testis of the cat (Felis domestica, L)]. / Struktur des Hodennetzes der Katze (Felis domestica, L.).

The rete testis of the cat consists of 3 parts: a septal or interlobular part; a mediastinal part and a tunical part. The septal part contains the septal or transitory tubuli recti and the tubuli recti. The transitory tubules are formed as a confluence of the seminiferous tubules at the apex of the testicular lobules and the tubuli recti. The mediastinal rete is formed of long, straight channels which increase in size and become more irregular and anastomotic below the tunica albuginea at the cranial extremity of the testis. The end is characterized as the tunical part of the rete testis and communicates with the extratesticular rete testis. The channels all parts of the rete are lined by simple cuboidal or columnar epithelium. These epithelial channels are supported by a connective tissue containing smooth muscle cells. The framework tissue of the rete is more conspicuous at the cranial extremity of the testis, with a mio-connective matrix organization.

[The vesical medial artery, Rauch 1963, of the dog (Canis familiaris)]. / Contribution à l'étude de "l'artère vésicale media, Rauch 1963" du chien (Canis familiaris).

The Authors study 30 adult dogs from both sexes, on the "vesical medial artery--Rauch, 1963" injected with latex through the aorta. They conclude that: 1--the vessel should be named "ventral vesical artery"; 2--it is a sharply defined structure and can't be confused with the "inferior" or "caudal vesical artery"; 3--emerging from the deep femoral artery (A. profunda femoris), caudal epigastric artery (A. epigastrica caudalis), or from the pudendoepigastric trunk (Truncus pudendoepigastricus), the "ventral vesical artery" appeared bilaterally (6.66%); unilaterally to the right (13.33%) and unilaterally to the left (3.33%); 4--when present, the "ventral vesical artery" supplies the ventral area of the bladder (Vesica urinaria) and regional fat, and eventually, gives a few branches to the prostate gland and urethra.

[The urogenital artery of the adult dog]. / Contribution à l'étude de l'artère urogénitale du chien adulte.

For this study 52 formaldehyde-fixed pelvis from both sexes dogs (Canis familiaris), unknown races and different ages, injected with latex through the aorta, were used. The results were classified in common (A) and uncommon (B, B1, B2 and B3) modalities: A-44 dogs (84.62%; 74.82-94.42%), with emergence of the urogenital artery from the visceral branch of the hypogastric artery; B-5 dogs (9.62%; 2.70-22.10%), where the vessel arises from the umbilical artery. In this manner, the intrapelvic organs (ureter, deferent duct, bladder, prostate and urethra in male, and ureter, bladder, urethra, uterus and vagina in female) are supplied with blood through the urogenital and umbilical arteries, and urethral branch, as well as the cranial and ventral vesical arteries to the bladder.

[The phrenic nerve in the guinea pig (Cavia porcellus L. 1756)]. / Etude du nerf phrénique chez le cobaye (Cavia porcellus, L., 1756).

The aim of the present study was the ascertain in the mode of origin of the phrenic nerve and to provide a morphological basis for experimental studies of this nerve in the guinea pig. In sketches made of the dissections, in 10 male and 10 female guinea pigs adults, the modes of origin of the phrenic roots were demonstrated to arise from the fourth to the seventh cervical nerves. Four types of origin could be distinguished. The phrenic nerve of guinea pig has three or four roots.

[Considerations on the renal lobes in Gallus gallus, Indian River]. / Considérations sur les lobes rénales de Gallus gallus--Indian River.

Textbooks and articles do not provide sufficient descriptions of the fowl kidney, mainly the renal lobes and their measurements. The observations of the renal lobes was carried out in 40 fowls (Gallus gallus), Indian River, 27 females and 13 males, with different ages (Grupe I: one month; Grupe II: 2 months and Grupe III: more than 3 months). We have observed that: a) there is a relative assymetry on the form and position of the renal lobes; b) the cranial lobe is the most large and the middle, the most long; and c) averages about the lobes, in relation to the both antimeres and length-width, are recorded.

Fine structure of the interstitium of the epididymis of the South American Opossum (Didelphis azarae, Marsupialia).

The interstitial space of the ductus epididymidis of the opossum (D. azarae), contains fibers and cell elements of the connective tissue, smooth muscle cells and amyelinic nerve fibers. This structure, studied through TEM, is similar to the fine structure of the interstitium of the epididymis in rodents. However, the normal occurrence of mast cells in the interstitial space of the ductus epididymidis in opossum, seems to be a peculiar morphological characteristic of this species.

Fine structure of principal and basal cells of the cauda epididymidis of the South American opossum (Didelphis azarae).

The aim of the study was to investigate cytological characteristics of principal and basal cells, at the ultrastructural level, in the cauda epididymidis of the opossum. Adult sexually mature opossums were used. Signs of pinocytosis and absorption and secretion were seen in both cells. These functions and the fine structure of the principal and basal cells of this marsupial are discussed comparatively with the fine structure of these cells in the epididymidis of eutherian mammals.

[Pelvic visceral arteries of rabbits (Oryctolagus cuniculus)]. / Artères viscérales pelviennes chez le lapin (Oryctolagus cuniculus).

40 pelvic preparations of rabbits (oryctolagus cuniculus) were bilaterally studied by dissection under the stereomicroscope and angiography. The arterial pattern of the pelvis, i.e. origin and branching of the umbilical, urogenital and internal pudendal arteries (visceral branches), is described. The main characteristics observed are as follows: (1) The umbilical artery is permeable in adults and gives origin to the cranial vesical artery and a caudal branch that irrigates the pelvic urogenital organs and, eventually, the rectum, with six patterns of branching in both sexes. (2) Usually, the urogenital artery is the continuation of the visceral branch of the internal iliac artery. In 1 animal, unilaterally, it arises from the median sacral artery. In 12 animals (6 bilaterally and 6 unilaterally) the urogenital artery is absent. When present, it forms two branches, a cranial and a caudal one, that irrigate of the urogenital organs in both sexes. (3) The internal pudendal artery is the direct continuation of the internal iliac artery and gives to rise to some visceral branches that irrigate the penis, bulbourethral gland and rectum (with six patterns of branching) in males, and the vagina, clitoris and rectum (with three patterns of branching) in females.

Arterial pattern of the spleen in the domestic fowl.

The authors describe the variations on the origin, number and vascularization areas of the splenic artery of 50 fowls, 34 males and 16 females, Gallus gallus, Indian River, of different ages, with medium weight of 2.133 g. The results were expressed in relative percentage figures and compared with the literature cited.

Anatomical closure of the ductus arteriosus in the dog (Canis familiaris).

The ductus arteriosus was studied in 138 dogs (80 female and 58 male) aged from 6 h to 21 days. This experiment led us to conclude that the anatomical closure of the d. arteriosus starts within 96 h and is obliterated after 6 days in 100% of the animals studied. We have also evidenced that the closure starts in the medial part of the d. arteriosus and progresses to the pulmonary artery and aorta.