Search PubMed⌕ Search

Biomedical subjects

R Sarrat

Publications and source records attributed to R Sarrat.

At least 37 records · Page 2Linked to original sources
PubMed1988

Morphological variations of human ossicula tympani.

In a series of 100 cases, morphological variations of human ossicula tympani were studied. These have seldom been considered either in classic or recent descriptions. Among them, the malleus and stapes are the most variable ones. A geometric model is proposed to systematically study any variation from the typical ossicles. These morphological variations of ossicles could be related to age, sex, race, and could bring out peculiarities in acoustic transmission.

Ear Ossicles↗
PubMed1987

Electron microscopic studies on the pars intermedia of the rat under stress.

Using electron microscopy, we have studied the pars intermedia (PI) of the pituitary gland of Wistar rat under psychogenic stress, finding a considerable increase in dark cells. The cells of the PI present striking vacuoles in all their cytoplasms, increasing up to a phase of total cellular disintegration. We have also observed a cell type, not found in the animal control group, of regular size and electrondense matrix of medium contrast.

Animals↗
PubMedDate not supplied

The vasectomized testis.

We have performed a qualitative study on effects of vasectomy on the testicular structure. Vasectomy performed with the traditional technique changes testicular structure. At first, the injuries are slight and restricted, but gradually, and in a time-dependent manner, become more severe and extensive. Ultrastructure studies indicate that the spermatogonia and Sertoli's cells are the most resistant to vasectomy, and are even observed in some regenerating testes lacking a complete germinal epithelium. Morphometric studies revealed a decrease in epithelial depth, an increase in the thickness of the basement membrane and in surface of the interstitial space, all significant (P < 0.01) with respect to the control. However, the percentage of the interstitial tissue occupied by cells, did not show any significant difference. We propose that the increase of intraluminal pressure is the essential factor that provokes testicular atrophy.

Animals↗