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Biomedical subjects

H P Godinho

Publications and source records attributed to H P Godinho.

15 recordsLinked to original sources
PubMed1981

Frequency and duration of the stages of the cycle of the seminiferous epithelium of the nine-banded armadillo (Dasypus novemcinctus).

The majority of the cross-sections of seminiferous tubules of nine-banded armadillos show only one type of cellular association as in most eutherian and metatherian mammals with scrotal testes. The spermatogenic cycle was divided into 8 stages, in relation to the shedding of the spermatozoa. The relative frequencies (%) of stages 1-8 were, respectively: 16.6, 7.5, 12.9, 9.1, 9.7, 18., 11.7 and 13.6. The duration of the cycle was 8.15 days, as determined by intratesticular injection of [3H]thymidine and removing the tissue at different times after injection.

Animals↗
PubMed1981

Histology and mucosubstances histochemistry of the duodenum in suckling, prepuberal and puberal zebus (Bos indicus).

The histological and morphometric changes as well as the mucosubstances histochemistry of the zebu duodenum were studied in suckling, prepuberal and puberal zebus. The morphometric data indicate that this organ reaches maturity at 13 months of age. The duodenal glands are simple or ramified tubular presenting cells of various morphological types. They secrete less sialomucin associated to neutral mucosubstances in the glandular body than at base and ducts. The goblet cells elaborate neutral mucosubstances and sialomucin. No qualitative changes in the secretion of the goblet cells and duodenal glands were found in the duodenum of zebus suggesting that the production of mucosubstances is not associated to age or feeding habits.

Animals↗
PubMed1979

Age-related changes in the seminal vesicles of a Brazilian (Nelore) zebu.

Age changes in the structure of the seminal vesicles and in the rate of production of fructose and citric acid have been studied in a Brazilian (Nelore) zebu, from the fetal period to 36 months of age. At 3 and 6 months, the microscopic anatomy of the gland resembled that of the fetus; the tubules of the seminal vesicles had a reduced diameter and a low epithelial layer; only a few presented traces of secretion, and tissue contents of fructose and citric acid were accordingly low. At 12 months, the tubules were more ramified and had a larger diameter. In the 18-month-old animals the seminal vesicles presented substantial modifications; the tubules were large, with irregular lumina and surrounded by narrow stroma, the epithelial layer was higher than that of previous stages and its columnar cells had nuclei located basally. Tissue levels of fructose increased rapidly between 12 and 18 months. At 24 months, the seminal vesicles had reached the adult condition characterized by intense proliferation of tubules with irregular lumina and abundant secretory material. Numerous dark columnar cells were found in the epithelium. Seminal vesicles of Nelore zebus contain less fructose and citric acid than those of taurine bulls of comparable age.

Age Factors↗
PubMed1977

Blood supply to the testis of a Brazilian marsupial (Didelphis azarae) and its abdominotesticular temperature gradient.

The testicular arteries of Didelphis azarae originate from the abdominal aorta either independently from each other or by way of a common trunk. Accessory testicular arteries may be found. At the spermatic cord they form a rete mirabile having 26.8 +/- 5.0 and 29.3 +/- 4.9 slender branches on the right and left sides, respectively. The arterial branches are intermingled with veins of similar caliber and number. Near the testis the branches of the rete reunite in a single vessel which then penetrates the parenchyma of the testis. Inside the testis the artery divides usually into two main branches that course toward the caudal pole. The rectal, scrotal and testicular temperatures were 32, 28.5 and 30.4 degrees C, respectively, appearing than an abdominotesticular gradient temperature exists in this animal. Whether this mechanism is thermoregulatory for the normal spermatogenesis cannot be inferred from the present work.

Animals↗
PubMed1977

Microscopic anatomy of the scrotum, testis with its excurrent duct system and spermatic cord of Didelphis azarae.

The authors give a description of the microscopic anatomy of the scrotum, testis and its excurrent duct system and the structures of the spermatic cord. The scrotal skin of Didelphis azarae is hairy with the surface marked by shallow grooves and spotted with black pigmented areas. Clear cells and mitotic figures are frequently seen in the basal region. The sweat glands are tubular, apocrine, with alcian-blue- and PAS-positive secretion, presenting large myoepithelial cells. The tunica dartos is poorly developed. The tunica vaginalis is constituted by three layers, presenting patches of melanocytes in variable extensions. The tunica albuginea is composed preponderantly of collage and thin elastic fibers without muscle fibers. The interstitial tissue presents connective cells and a large number of Leydig cells. Mast cells were not observed. The tunica propria of the seminiferous tubuli is fibroelastic with two or three layers of elongated cells. The straight tubuli are divided into three different portions lined by epithelium with variable height. These tubuli at the mediastinum join each other to form a single duct near the cranial pole of the testis. The extratesticular segment of the efferent duct divides initially into two and then into three or four smaller flexuous ductuli to constitute the head of the epididymis. The spermatic cord shows a well-developed cremaster muscle. A collagenous fibrous band separates the muscle from the deferent duct and vessels. Mast cells are observed among the muscle fibers of the cremaster and the tunica adventitia of the blood vessels.

Animals↗
PubMed1976

Histological and histochemical aspects of the mucosa of the nasal conchae in the zebu (Bos indicus).

In various respiratory areas of the mucosa of the nasal conchae of the zebu (Bos indicus) there is a quantitative variation of goblet cells. The glands are tubular or tubulo-alveolar, having morphologically serous and mucous cells. The excretory ducts are formed by non-secreting cells. The goblet cells and glands elaborate a glycoprotein. The carbohydrate portion is probably an association of neutral mucopolysaccharides, sulphated acid mucopolysacchardies and sialic acid and its proteic portion contains alpha-amino radicals. Tryptophan- and tyrosine-rich proteins are demonstrated only in the glandular secretion.

Animals↗
PubMedDate not supplied

Gonadal and extragonadal sperm reserves of the Brazilian Nelore zebu (Bos indicus).

Gonadal and extragonadal sperm reserves were estimated through hemocytometric method in six Nelore zebu bulls, aging 4-6 years, with normal spermatogenesis, and kept at sexual rest. Gonadal sperm reserve was estimated to be 47.8 +/- 5.8 X 10(6) sperm cells/g testis parenchyma and 9.8 +/- 1.7 X 10(9) sperm cells/testis. Using a time divisor of 4.94 days the daily sperm production was estimated to be 10.0 +/- 0.9 X 10(6) sperm cells/g testis parencyma/day and 2.0 +/- 0.3 X 10(9) sperm cells/testis/day. Epididymal sperm reserve amounted 11.9 +/- 1.6 X 10(9) spermatozoa/organ, distributed as follows: 35.3 +/- 3.6% in the head, 16.9 +/- 1.7% in the body and 47.7 +/- 3.7% in the tail.

Animals↗