摘要:

Stereotactic coagulations of intralaminar thalamic nuclei in 6 squirrel monkeys Saimiri sciureus produced dark degenerations only of type IV synapses in pallidum externum, according to the classification of Hassler and Chung often preserving the slightly asymmetric contact and subsynaptic densities. Other type IV boutons underwent semidark degeneration, whereas others showed crystalloid degeneration. Some of type IV boutons show the deposition of many dense core vesicles and mitochondria with loss of most synaptic vesicles. Enlarged type IV boutons are sometimes overcrowded with irregularly shaped lysosomes. Thus, a monosynaptic connections of intralaminar thalamic nuclei to pallidum externum could be demonstrated.

ISSN:1422-6405    

DOI:10.1159/000146029

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

This study was conducted on two species of monkeys, Macaca fascicularis and Macaca mulatta, to determine if there were vascular connections between the kidney and other abdominal structures such as the adrenal glands. Microfil vascular perfusions, followed by microscopic observations and dissections, were utilized to investigate the existence of these potential connections. Highly anastomotic renal capsular vessels were always observed on the outer surface of the renal capsule. However, these capsular vessels did not make connections with the subcapsular capillary plexus in the majority of monkeys studied. Vascular connections between the adrenal gland and kidney were not observed. It was concluded that, although the region between the adrenal gland and kidney was rich in vasculature, it did not appear to play an anatomical role in anastomosing the extrarenal and intrarenal circulations.

ISSN:1422-6405    

DOI:10.1159/000146030

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

Four about 4-week-old puppies were fixed by perfusion; the secretory ameloblasts of the first molar tooth germs were observed with an electron microscope. The morphology of the puppy secretory ameloblast closely resembles that of man. In addition, the primary cilia and a pair of basal bodies were observed close to Golgi apparatus of the secretory ameloblast. Cytoplasmic microtubules radiated from the basal bodies. It is suggested that a pair of basal bodies may be the microtubule-organizing center of the secretory ameloblast. Further, melanocytes were present in the intermediate cell layer and aggregated melanosomes were present in the cytoplasm of both stratum intermedium cells and secretory ameloblasts.

ISSN:1422-6405    

DOI:10.1159/000146031

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

In 300 Sienese skulls of known age and sex (146 male and 154 female) 6 modes of expression of bipartition of the hypoglossal canal were studied on the basis of a new scheme of notation that takes into account gradually increasing intensity. The analysis of data, including also the traditional method of notation confirms the criticisms expressed by various authors on the loss of information when the variability of this trait is neglected, especially with reference to age-dependent changes (hyperostotic effects).

ISSN:1422-6405    

DOI:10.1159/000146032

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

The effect of estradiol-17-beta on lipids of the ventricular myocardium of mice has been studied with a cytochemical technique in which malachite green was added to glutaraldehyde. This malachite green-glutaraldehyde fixative enhances the visualization of certain phospholipid-related elements. Estrogen induces an affinity of ventricular cardiac lipid inclusions for the cationic dye malachite green. The staining affinity is evidenced only in the estrous female, not in diestrus. In oophorectomized animals, malachite green staining is seen only following estradiol injection, but this effect is blocked by progesterone. In the male, ventricular lipids do not stain, nor do they develop malachite green affinity with estrogen stimulation. These results imply a blockade of the estradiol-mediated dye affinity by progesterone and testosterone. This reinforces the concept of the heart as a target organ for sex steroids and expands the previously described estrogen effects on myocardium.

ISSN:1422-6405    

DOI:10.1159/000146033

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

The blood supply of the ano-rectum has been studied in cadaveric specimens by angiographic methods. The vascular anastomosis between the middle rectal and superior rectal vessels was found to be demonstrable on one side only. There appears to be a midline paucity of vessels in both the posterior and anterior rectal walls, and this may be important in the aetiology of anastomotic dehiscence in low anterior resection.

ISSN:1422-6405    

DOI:10.1159/000146034

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

The alkaline phosphatase and DNA-RNA activities in the retinas of young and old albino mice were determined histochemically after photic exposure. Different patterns between the two age groups were obtained for the alkaline phosphatase reaction before and after photic exposure. In the young animals, more retinal layers showed increased activity after exposure whereas in the old animals, the converse was true. DNA-RNA reaction revealed decreased DNA activities in the old animals 30 h after exposure. The results were also correlated with biochemical studies on the uptake of 2-deoxyglucose, dopamine and leucine.

ISSN:1422-6405    

DOI:10.1159/000146035

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

A coronal bone suture segment was autotransplanted into an experimentally created defect in the nongrowing portion of the nasal bone in 12 5-week-old male New Zealand white rabbits. The animals were sacrificed 90 days postoperatively. In most specimens the transplants were well incorporated into the recipient site. The transplanted sutures appeared narrower radiographically, and the bony projections of the sutures were not as long as those seen in control sutures. In each case the transplanted sutural ligament had atrophied, and six of the transplants showed bony union across the sutural space. The results suggest that growth and biomechanical stresses are important for maintenance of the sutural ligament and for the stimulation of bone deposition.

ISSN:1422-6405    

DOI:10.1159/000146036

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

The elastic laminae were extracted from thoracic aortas of adult animals including sheep, dogs, rabbits, cats and rats by treating them in hot alkaline solution (0.1 /VNaOH at 75 °C) and observed with a scanning electron microscope. The elastic laminae are comprised of sheet-like internal elastic lamina, fibrous and membraneous elastin in tunica media, interlamellar fibers and hollow spaces which we presume were formerly filled with smooth muscle cells in the tunica media. These structures are the same in all five species except that the number of layers and the total thickness of the wall differs

ISSN:1422-6405    

DOI:10.1159/000146037

出版商:S. Karger AG    

年代:1985

数据来源: Karger

摘要:

Autoradiography of tritiated leucine, injected into the vestibular nuclei in 20 cats, was used to trace the projection of the secondary vestibular fibers in the cerebellum. The distribution of these fibers in the cerebellar cortex is described and discussed in relation to the findings from other experimental works.

ISSN:1422-6405    

DOI:10.1159/000146038

出版商:S. Karger AG    

年代:1985

数据来源: Karger