摘要:

Muscle samples were taken from the superficial part of the semitendinosus muscle of four standardbred horses to compare the effects of three different fixation procedures on fiber size and capillarity. Infiltration fixation in an extended position of the muscle was compared to immersion fixation and infiltration fixation in a flexed position of the limb. The capillary length density was used to estimate muscle capillarity. Infiltration fixation was found to be a viable alternative to perfusion fixation of muscles for morphometry of fiber size and capillary length density allowing muscle tissue fixation at a defined sarcomere length without fiber kinking.

ISSN:1422-6405    

DOI:10.1159/000146621

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The frequency of lipid droplets in the parathyroid glands of young, adult and senile golden hamsters after starvation was investigated. In the parathyroid glands of the young and senile golden hamsters, the number of lipid droplets increased to reach a peak by 2 days, then decreased slowly by 5 days after starvation, and decreased rapidly after refeeding. In the glands of adult animals it increased to reach a peak by 5 days after starvation and decreased rapidly after refeeding.These findings suggest that in the fasting condition there is a relationship between the number of lipid droplets and aging.

ISSN:1422-6405    

DOI:10.1159/000146622

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The synapses of the rat superior cervical sympathetic ganglion were studied with both conventional and ultrastructural histochemical methods. Besides the cholinergic synapses polarized from preganglionic fibers to sympathetic ganglion neurons, two morphologically and functionally different types of synapses were observed in relation to the small granule-containing (catecholamine-containing) cells of the rat superior cervical ganglion.The first type is an efferent adrenergic synapse polarized from granule-containing cells to the dendrites of the sympathetic ganglion neurons.This type of synapse might mediate the inhibitory effects (slow inhibitory postsynaptic potentials) induced by catecholamines on the sympathetic neurons. The second type is a reciprocal type of synapse between the granule-containing cells and the cholinergic preganglionic fibers. Through such synapses, these cells could exert a modulating effect on the excitatory preganglionic fibers. Therefore, we propose that these cells, through their multiple synaptic connections, exhibit a local modulatory feedback system in the rat sympathetic ganglia and may serve as interneurons between the preganglionic and postganglionic sympathetic neurons.

ISSN:1422-6405    

DOI:10.1159/000146623

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The immunocytochemical localization of parathyroid hormone was examined in the hamster parathyroid gland by using the protein A-gold technique. Protein A-gold particles were concentratedover secretory granules, large secretory granules thought to be storage granules and Golgi vacuoles. No protein A-gold particles were detected over large vacuolar bodies and cisternae of the granular endoplasmic reticulum.

ISSN:1422-6405    

DOI:10.1159/000146624

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The principal part of the supraoptic nucleus (SON) of the rat presents specific developmental factors. The parameters selected for their evaluation were volume of the SON, neuronal number and neuronal density. White Wistar rats of the age of 18, 19, 20, 22 and 23 intrauterine days, 15 days and 1, 3, 6,12,18 and 30 months were chosen for this study. The rat brains were fixed, cut into 10-µm-thick sections and stained with hematoxylin-eosin.The different measurements were carried out with a semiautomatic IB AS I image analyzer. In all stages of the rat life an increase in volume and a decrease in neuronal density per surface unit could be observed, but there was a difference in the dynamics of these changes depending on the stage in which the parameters were determined. There were two periods in the life of the rat in which neuronal death was very significant. The first was between the embryonic and juvenile stage and the second between the adult and senile stage. The increase in the volume influences predominantly the value of neuronal density

ISSN:1422-6405    

DOI:10.1159/000146625

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

An aberrant cutaneous nerve of the thigh arising from the peroneal portion of the human sciatic nerve or common peroneal nerve was observed in 9 cases (4.6% of sides). After giving a branch to the short head of the biceps femoris muscle and a branch to the knee joint, this cutaneous nerve reaches the subcutaneous tissue by passing between the short head of the biceps femoris and the vastus lateralis or by piercing through the biceps femoris. The authors presume that the cutaneous nerve shows the presence of the potential cutaneous nerve routes from the common peroneal nerve to the skin of the lateral aspect of the thigh.

ISSN:1422-6405    

DOI:10.1159/000146626

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The vitamin-D-dependent calcium-binding protein, calbindin-D28k, was detected immunocytochemically in the majority of pericapillary pinealocytes of the rat superficial pineal body. The interstitial cells were calbindin -negative.The significance of these findings is discussed.

ISSN:1422-6405    

DOI:10.1159/000146627

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The occurrence of peptidergic cellular elements in the feline vagus nerve was examined by an immunohistochemical method. Some methionine-enkephalin-like immunoreactive cells were present around a few capillaries within the vagus nerve, whereas substance-P- and vasoactive-intestinal-polypeptide-like immunoreactive cells were not observed. The methionine-enkephalin-like immunoreactive cells had an oval shape and their diameter was 7–10 µm. These cells appeared to be in contact with the pericyte of the capillaries. Though the physiological function of these enkephalin-positive cells is unclear, our findings suggest that they can act as endocrine cells and release methionine-enkephalin into the capillari

ISSN:1422-6405    

DOI:10.1159/000146628

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The adrenergic innervation of the gall-bladder of healthy persons and patients suffering from cholecystitis has been studied following fluorescence histochemical methods.The normal gall-bladder is moderately innervated by adrenergic nerve fibres. Fine nerve fibres have been observed in the lamina propria, fibromuscularis and serosa. Catecholamine-containing fluorescent cells have been observed at different sites and their possible role as chemoreceptors and their endocrine nature have been reaffirmed. Adrenergic nerve fibres show signs of degeneration in cholecystitis as is evidenced by swelling of the nerve fibres and enhanced intensity of fluorescence in fluorescent cells.

ISSN:1422-6405    

DOI:10.1159/000146629

出版商:S. Karger AG    

年代:1988

数据来源: Karger

摘要:

The effects of fluoride on the mandibular condyles in growing newborn rats were studied by histological, histometrical and fluoride electrode methods. The layer of cartilage of the mandibular condyle in the animals administered 5,15, 25 and 35 mg/kg of fluoride for 3 weeks displayed a significant increase in thickness when compared with that of the mandibular condyle in the control animals. The thickening of the cartilage layer was proportioned to the amounts of fluoride administered. The volumetric density of cancellous bone of the condyle in the animals administered 25 and 35 mg/kg of fluoride also increased significantly when compared with that of the condyle in the control animals. The trabeculae of cancellous bone of the condyle in these animals contained large amounts of osteoid. The cancellous bone of the condyle in the animals of the four fluoride groups showed a significantly higher fluoride concentration when compared with that of the condyle in the control animals.The fluoride concentration proportionally increased with the amounts of fluoride administered. The results of the present study indicate that the morphologic changes and the fluoride concentrations in the mandibular condyles of rats receiving fluoride were closely correlated with each other.

ISSN:1422-6405    

DOI:10.1159/000146630

出版商:S. Karger AG    

年代:1988

数据来源: Karger